Wyniki wyszukiwania - Biblioteka Nauki

1

Synthesis and Characterization of Iron Oxide Nanoparticles Reinforced Polyester/Nanocomposites

100%

Kumar G. N. , Reddy Y. V. M. , Reddy K. H.

International Letters of Chemistry, Physics and Astronomy

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2015

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tom Vol. 52

39--52

EN

We report on synthesis of two highly disperse nanoparticles viz. Fe2O3 & f-Fe2O3 using chemical reduction method. Reaction was initiated to mix solution A (i.e. Fecl3 6H2o) into solution B (i.e. Fecl24H2O) together under the presence of ammonium to develop nanoparticles. Mechanical properties of above mentioned nanoparticles filled with polyester polymer nanocomposites were fabricated to assess the possibility of using this filler as a new material. Methacryloxypropyl was used as a functionalization agent to prepare f-Fe2O3nanoparticles. Mechanical properties of f-Fe2O3 nanocomposites were improved with the help of functionalization when compared with Fe2O3 nanocomposites. A functionalization of nanoparticles favours the composite fabrication with a lower curing temperature as compared to the as-synthesised nanoparticles filled polyester nanocomposites. Thermogravimetric analysis showed an increased thermo-stability of f-Fe2O3 nanoparticles filled polyester nanocomposites as compared to the Fe2O3 nanoparticles filled counterparts. Mechanical and thermal properties were increased due to the homogeneous particle dispersion and chemical bonding between nanoparticles and polyester matrix. The nanoparticles become magnetically harder after incorporation into the polyester resin matrix.

2

Identification of Yield Point of Polymer-Based Composite Material in the Conditions of Increased Temperatures

80%

Arustamian A. , Sołek K. , Kalisz D.

Archives of Metallurgy and Materials

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2016

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tom Vol. 61, iss. 3

1561--1566

EN

Theoretical and practical research on the influence of temperature on mechanical characteristics of the composite material MM “Steel 1018” has been conducted. Both laboratory equipment used to measure of mechanical properties, the technique of material preparation and the experimental procedure were described. The analysis of the the obtained results revealed that with temperature increase the material yield point goes down.

3

Mechanical properties of lightweight expanded clay aggregate (LECA) concrete

80%

Issa A. S. , Al-Asadi A. K.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2022

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tom Vol. 31, No. 3

161--175

EN

The construction activities are based on structural concrete, which is one of the most commonly used materials. The fundamental aim of using lightweight concrete (LWC) was to reduce the concrete self-weight of the structure parts. As a result, LWC has been used successfully in a variety of installations for several years. In this paper, the mechanical properties of concrete made with lightweight expanded clay aggregate (LECA) as a full replacement for coarse aggregate are studied. The experimental program shows that LECA with a 32 MPa cube compressive strength and an 1,823 kg×m–3 dry density can be used to make structural light-weight aggregate concrete (SLWC). The results show that the reduction in the strength of lightweight aggregate concrete (LWAC) was found to be higher in the concrete with an estimated compressive strength of 32 MPa due to the lower strength of the LWA (expanded clay). According to the test results, the mechanical properties of LWC were greatly improved by adding silica fume (SF). Furthermore, LECA concrete has a splitting tensile strength that is 47% higher than the ASTM C330/C330M-17A minimum requirement. The LECA concrete has a splitting tensile strength to compressive strength ratio of approximately 13%. Additionally, the results demonstrate a 27% difference in the modulus of elasticity between the calculated and tested values.

4

Influence of Sterilization and Exposure to the Ringer's Solution on Mechanical and Physicochemical Properties of Nitrocarburized 316 LVM Steel

80%

Kajzer A. , Rabij K. , Basiaga M. , Nowińska K. , Kaczmarek M. , Borowski T. , Wierzchoń T.

Archives of Metallurgy and Materials

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2018

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tom Vol. 63, iss. 3

1257--1266

EN

Studies on biocompatibility of AISI 316LVM steel indicate the need to eliminate the nickel from the surface and replace it with other elements of improved biocompatibility. Therefore, in the presented work selected physicochemical and mechanical properties of the diffusive nitrocarburized layer formed by plasma potential by means of an active screen made of the Fe-Cr-Ni were studied. In the paper we present results of microstructure and phase composition of the layers, roughness, and surface wettability, potentiodynamic pitting corrosion resistance, penetration of ions into the solution as well as mechanical properties. The studies were conducted for the samples of both mechanically polished and nitrocarburized surfaces, after sterilization, and exposure to the Ringer’s solution. Deposition of the nitrocarburized layer increased the contact angle, surface roughness, surface hardness, and corrosion resistance with respect to the polished surfaces. The nitrocarburized layer is a barrier against the ions release into the solution and sterilization and exposure to Ringer solution. The obtained results showed beneficial increase of both mechanical and electrochemical properties of the deposited layer, and thus the applicability of the proposed method of surface treatment of the 316 LVM steel for short-term implants after sterylization.

5

Thermal and structure analysis of the MA MgAl6Zn3 magnesium alloy

80%

Dobrzański L. A. , Król M.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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tom Vol. 46, nr 2

189--195

EN

Purpose: This work presents effect of cooling rate structural properties and thermal characteristic results of MA MgAl6Zn3 cast alloy. Design/methodology/approach: The experiments were performed using the novel Universal Metallurgical Simulator and Analyzer Platform. Material used in this experiment is experimental magnesium alloy made as-cast. Findings: The research show that the thermal analysis carried out on UMSA Technology Platform is an efficient tool for collect and calculate thermal parameters. The formation temperatures of various thermal parameters and grain size are shifting with an increasing cooling rate. Research limitations/implications: This paper presents results for one alloy - MA MgAl6Zn3 only, cooled with three different solidifications rate i.e. 0.6, 1.2 and 2.4°C/s, for assessment for the liquidus, solidus and others temperatures and its influence on the structure. Practical implications: The parameters described can be applied in metal casting industry for selecting magnesium ingot preheating temperature for semi solid processing to achieve requirements properties. Originality/value: The paper contributes to better understanding and recognition an influence of different solidification condition on non-equilibrium thermal parameters of magnesium alloys.

6

Effect of polypropylene fiber addition on mechanical properties of concrete based on portland cement

80%

Małek M. , Życiński W. , Jackowski M. , Wachowski M.

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2018

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tom nr 21(3)

207--214

EN

In this work results of poly(propylene) fibers (PP), from recycling process, added into concrete mixture based on portland cement was characterized. The main purpose of this research was to identify direct influence of the fibers addition on the concrete mechanical strength. The recipe of the concrete was prepared using three types of aggregates with different grain size: 0.125–0.250, 0.250–0.500 and 0.500–1.000 mm, deflocculant based on polycarboxylates, water and portland cement (42.5 MPa). To identify structures of the researched samples and fibers light microscopy (LM) observation was performed. Basic properties of concrete mixture were defined by slump cone test and setting time. Mechanical properties such as compressive strength and bending test after 1, 7, 14 and 28 days were characterized. Obtained results were compared with mixtures without fibers modifications. Study was proven that all chosen fibers from recycled origin revealed increased effect on final mechanical properties of concrete and are very perspective for future application in concrete technology.

7

Mechanical and biological properties of carbon fiber-reinforced peek composite materials intended for laryngeal prostheses

80%

Smółka W. , Dworak M. , Noworyta B. , Gubernat M. , Markowski J. , Błażewicz M.

Engineering of Biomaterials

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2019

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tom Vol. 22, no. 151

2--8

EN

The work deals with the mechanical properties and biological behaviour of composite materials made of polyether ether ketone (PEEK) polymer and carbon fibers (CF) designed for laryngeal biomaterials. Two types of PEEK–based matrix composites containing carbon fibers in the form of cloth (2D) and short fibers (MD) were made. The composite samples were obtained via hot mol-ding of PEEK/CF prepregs. Mechanical durability of the composite samples aging in Ringer’s solution at 37oC was analyzed. The samples were dynami-cally loaded under bending force up to 106 cycles. The ultrasonic wave propagation method was applied to study changes in the composites. The mechanical changes were analyzed, taking into consideration the anisotropic structure of the composite samples. The layered composite samples were modified with multiwalled carbon nanotubes (CNTs). The changes in mechanical stability of the composite samples were not significant after fatigue testing up to 1·106cycles. The biological tests were carried out in the presence of hFOB-1.19-line human osteoblasts and HS-5-line human fibroblasts. The level of type I collagen produced from both types of cells was determined by ELISA test. The tests showed differen-ces between the samples with regard to the viability of the cells.

8

Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders

80%

Żórawski W. , Makrenek M. , Góral A.

Archives of Metallurgy and Materials

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2016

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tom Vol. 61, iss. 4

1839--1846

EN

Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure and composition of WC-12Co nanostructured powder were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Investigations revealed nano grains of WC with the size in the range of 50-500 nm. The nanostructured sprayed coating was analysed by SEM and phase composition was investigated by X-ray diffractometer (XRD). A denser coating structure with higher hardness was observed compared to conventional coating with a small amount of W2C, WC1−x, W and some amorphous phase. Young’s modulus and hardness were determined by depth sensing indentation in HVOF sprayed WC-12Co nanostructured coatings. Results were compared to conventional coatings and the relevance of the nanostructure was analyzed. An indentation size effect was observed on the polished surface and cross-section of both coatings. Data provided by indentation tests at maximum load allow to estimate hardness and elastic modulus. Enhanced nanomechanical properties of conventional coating in comparison to nanostructured one were observed. Nanostructured coatings WC-12Co (N) revealed significantly better corrosion resistance.

9

Molecular dynamics study of the fracture of single layer buckled silicon monosulfide and germanium selenide

80%

Le M.-Q.

Archives of Mechanics

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2022

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tom Vol. 74, nr 1

3--12

EN

Molecular dynamics simulations were conducted with the Stillinger–Weber potential at room temperature to study the mechanical properties and find the mode-I critical stress intensity factor of buckled two-dimensional (2D) hexagonal silicon mono-sulfide (SiS) and germanium selenide (GeSe) sheets. Uniaxial tensile tests were simulated for pristine and pre-cracked sheets. 2D Young’s modulus of SiS and GeSe are estimated at 38.3 and 26.0 N/m, respectively. Their 2D fracture strength is about 3.1–3.5 N/m. By using the initial crack length with the corresponding fracture stress, their mode-I critical stress intensity factor is estimated in the range from 0.19 through 0.22 MPapm. These values differ within 5% from those obtained by the surface energy and are very small compared to the reported fracture toughness of single-crystalline monolayer graphene.

10

Experimental Analysis of Nitrogen as an Alloying Element in WC9 Grade Steel

80%

Vishnuh V. , Sudhakar S. , Tamilarasu K. , Prabhakaran P. , Rajasekar R.

Archives of Metallurgy and Materials

|

2017

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tom Vol. 62, iss. 3

1889--1894

EN

In the present work the effect of nitrogen on WC9 alloy at various weight percentages was analyzed and tested for their microstructural and mechanical properties. The nitrogen was added at 0.05, 0.10, 0.15, 0.20 and 0.25 wt. % in the solid form as nitrided ferrochrome to WC9 alloy. The samples were heat treated by solution annealing process at a temperature of 1100°C for 5 hours to improve the austenitic formation. Microstructures and mechanical properties such as tensile strength, yield strength, hardness, % elongation and % reduction of WC9-N alloy were examined. It was observed that increasing nitrogen wt. % increases the mechanical properties. The obtained mechanical properties were compared with base WC9 and C12A grade steel, where it was found to be replacement for C12A grade steel at its composition at lower end. The material cost analysis for WC9-N and C12A grade steel was done and both were compared.

11

Mechanical Properties and Microstructure of PM Mn-Cr-Mo Steels With Low Carbon Concentration

80%

Lichańska E. , Sułkowski A. , Ciaś A.

Archives of Metallurgy and Materials

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2016

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tom Vol. 61, iss. 1

109--114

EN

The effect of chemical composition of the sintering atmosphere on the microstructure and mechanical properties of PM structural low-carbon steels is presented. The base powders were Astaloy CrL, Astaloy CrM, low carbon ferromanganese and graphite C-UF. From the base powders two mixtures with compositions of Fe-3%Mn-(1.5/3%)Cr-(0.2/0.5)%Mo-0.2%C were prepared. Following pressing in a steel rigid die, compacts were sintered at 1250°C for 60 min in a semi-closed container. 5%H2-95%N2 mixture and air were the sintering atmospheres. For sintering in air, lumps of ferromanganese were placed with the compacts in the container. After sintering, half of the samples were tempered at 200°C for 60 minutes in air. Mechanical tests (tensile, bend, toughness, hardness) and microstructural investigations were performed. The microstructures of the steels were inhomogeneous, mainly ferritic-bainic. Tempering of steel based on Astaloy CrM sintered in an atmosphere of 5% H2-95% N2 slightly reduced tensile strength and toughness: from 748 to 734 MPa and from 7.15 to 6.83 J/cm2, respectively. Chemical composition had a greater effect; steels based on Astaloy CrL and Astaloy CrM had tensile strengths 526-665 and 672-748 MPa, hardness 280-325 and 388-421 HV, respectively. The best properties were obtained after sintering in air of Fe-3%Mn-3%Cr-0.5%Mo-0.2%C without heat treatment: tensile strength 672 MPa, toughness 6.93 J/cm2, hardness 421.1 HV, 0.2 % offset yield strength 395 MPa.

12

A Review on Aluminium Hybrid Surface Composite Fabrication Using Friction Stir Processing

80%

Patil N. A. , Pedapati S. R. , Mamat O. B.

Archives of Metallurgy and Materials

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2020

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tom Vol. 65, iss. 1

441--457

EN

Nowadays, Aluminium (Al) based hybrid surface composites are amongst the fastest developing advanced materials used for structural applications. Friction Stir Processing (FSP) has emerged as a clean and flexible solid-state surface composites fabrication technique. Intensive research in this field resulted in numerous research output; which hinders in finding relevant meta-data for further research with objectivity. In order to facilitate this research need, present article summarizes current state of the art and advances in aluminium based hybrid surface composites fabrication by FSP with in-situ and ex-situ approach. Reported literature were read and systematically categorized to show impacts of different types of reinforcements, deposition techniques, hybrid reinforcement ratio and FSP machine parameters on microstructures, mechanical and tribological characteristics of different Al alloys. Challenges and opportunities in this field have been summarized at the end, which will be beneficial to researchers working onsolid state FSP technique.

13

The modification process of AlSi21CuNi silumin and its effect on change of mechanical properties of the alloy

80%

Pezda J.

Archives of Foundry Engineering

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2011

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tom Vol. 11, iss. 2

101-104

EN

Due to difficulties present during machining operations and with segregation of crystals of primary silicon, hypereutectic silumins can be used after modification only. It is why elaboration of effective modification methods is necessary for complete utilization of such alloys for machinery parts made from castings. In the paper are presented test results concerning an effect of modification with phosphor copper and strontium of AlSi21CuNi silumin on change of its mechanical properties [...] and its structure. Investigated alloy was melted in electric resistance furnace. All smelting processes were performed in temperature of 800 - 820oC. Obtained results concern light microscopy and strength tests of the investigated alloy. Performed tests have shown that application of phosphorus in form of CuP10 and AlSr10 master alloy as an inoculant gives positive results in form of refinement of primary crystals of silicon. Modification with phosphorus has enabled obtainment of clearly visible growth of tensile strength, [...].

14

Metallurgical products of microalloy constructional steels

80%

Ozgowicz W. , Opielak M. , Grajcar A. , Kalinowska-Ozgowicz E. , Krukiewicz W.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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tom Vol. 44, nr 1

7--34

EN

Purpose: The aim of the paper is a monographic presentation, based on investigations connected with the elaboration of new kinds of microalloy steels and a technique of heat and thermo-mechanical treatment in the production of a selected group of metallurgical products. Design/methodology/approach: The influence of the chemical composition and metallurgical purity on the homogenisation of austenite was analysed, as well as thermally activated processes and phase transformations in the course of deformation and controlled cooling conditions, concerning micradditives Nb, V, Ti, B and metallurgical products. Findings: The chemical composition of the obtained constructional steels with microadditives was quoted, as well as the technological conditions of forging and rolled products required for industrial purposes. Research limitations/implications: The results of investigations concerning the structure and mechanical properties have been presented, as well as the resistance to fracture, mainly of thick plates and hand-forged and drop-forged products and also elements of sheet structures for the automotive industry, made of AHSS steels. Practical implications: The results of the author’s own investigations concerning microalloy steels indicate the actual possibility of their application in practice in many steelworks, particularly in plants producing semi products and final metallurgical products, among others in hot rolling plants and forging shops, first of all in machine building and automotive industry. Originality/value: The application of modern metallurgical technologies and metalforming has been suggested for selected metallurgical products of microalloy steels of the type HSLA with a ferrite-bainite, bainite or tempered martensite structure and also of HSS steels and UHSS steel with a wide range of mechanical properties and technological formability, which is essential in the case of products of the automotive industry.

15

Ocena właściwości mechanicznych glin ablacyjnych zlodowacenia bałtyckiego określona na podstawie testu statycznego sondowania CPTU i w aparacie bezpośredniego ścinania

80%

Borowczak P.

Archiwum Instytutu Inżynierii Lądowej

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2011

|

tom Nr 9

165-177

PL

Metody określania parametrów wytrzymałościowych gruntów słabonośnych na podstawie badań laboratoryjnych są obecnie wypierane przez badania „in situ" prowadzonych głównie za pomocą sondowań statycznych. Zaletą sondowań jest ciągły pomiar rejestracji oporu stożka i tulei ciernej pozwalający z dużą dokładnością ustalić słabe miejsca w podłożu gruntowym, dla których na podstawie interpretacji wykresów można określić parametry tego podłoża. Ocena właściwości gruntów na podstawie próbek z wierceń badawczych dostarczanych do laboratorium, sprowadza się praktycznie do badań podstawowych, i wybiórczo ze względu na czas do określenia cech mechanicznych. W artykule porównano rezultaty badań otrzymanych z sondowań statycznych z wynikami osiągniętymi drogą tradycyjną w badaniach wytrzymałościowych realizowanych w aparacie bezpośredniego ścinania typu ABS.

EN

Determination of mechanical parameters by laboratory methods are more often replaced by advanced "in situ" methods, mainly by the static CPTU soundings. The advantage of the static soundings are continuous measurement of soil parameters, by registering friction on the cone. Such soundings allows very detailed measurements of every change is soil conditions. Proper interpretation of CPTU soundings gives soil parameters, including mechanical properties. Determination of soil parameters by laboratory testing, executed on samples taken by drilling methods, mainly deals with basic soil parameters, and only few samples are tested for determination of mechanical parameters. This is mainly due to limited time allowed for the investigations. This paper gives the comparison of results obtained from CPTU soundings and laboratory testing, mainly direct shear - ABS type tests.

16

Polymer composites modified by waste materials containing wood fibres

80%

Dębska B. , Lichołai L. , Godek P.

Journal of Ecological Engineering

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2016

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tom Vol. 17, nr 5

72--78

EN

In recent years, the idea of sustainable development has become one of the most important requirements of civilization. Development of sustainable construction involves the need for the introduction of innovative technologies and solutions that will combine beneficial economic effects with taking care of the health and comfort of users, reducing the negative impact of the materials on the environment. Composites obtained from the use of waste materials are part of these assumptions. These include modified epoxy mortar containing waste wood fibres, described in this article. The modification consists in the substitution of sand by crushed waste boards, previously used as underlays for panels, in quantities of 0%, 10%, 20%, 35% and 50% by weight, respectively. Composites containing up to 20% of the modifier which were characterized by low water absorption, and good mechanical properties, also retained them after the process of cyclic freezing and thawing.

17

The Influence of the Angle of Working Part of Die on the Zinc Coating Thickness and Mechanical Properties of Medium Carbon Steel Wires

80%

Suliga M. , Wartacz R.

Archives of Metallurgy and Materials

|

2019

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tom Vol. 64, iss. 4

1295--1299

EN

The paper discusses experimental studies to determine the effect of the die working portion angle on the lubrication conditions, zinc coating thickness and the mechanical properties of medium-carbon steel wires. The test material was 5.5 mm-diameter wire rod which was drawn into 2.2 mm-diameter wire in seven draws at a drawing speed of v = 10 m/s. Conventional drawing dies of a working portion angle of α = 3, 4, 5, 6, 7°, respectively, were used for the drawing process. After the drawing process, the quantity of the lubricant on the wire surface and the thickness of the zinc coating were determined in individual draws. Testing the finished 2.2 mm-diameter wires for mechanical properties, on the other hand, determined the effect of the die working portion on the yield point, tensile strength, uniform and total elongation, reduction in area, the number of twists and the number of bends.

18

Evaluation of some plastic wastes as additives to reinforce high-density fiberboard (HDF)

80%

Külçe T. , Ateş S. , Olgun Ç.

Drewno : prace naukowe, doniesienia, komunikaty

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2021

|

tom vol. 64, nr 208

79--93

EN

The use of plastic wastes in the forest product industry as an additive material is an alternative solution for reducing environmental pollution. In this study, different types of plastic wastes, polyethylene terephthalate (PET), polypropylene (PP), and polystyrene (PS), which have various characteristics and considerable potential as reinforcing materials for wood fibers, were added to high-density fiberboard (HDF) in different mixture ratios (25/75, 50/50, 75/25) with commercial fibers. Changes in some properties of the boards, including density, water absorption, thickness swelling, modulus of elasticity (MOE), bending strength (MOR), and internal bond strength, were determined. It was found that water absorption and thickness swelling ratios were lower in the boards with plastic waste additive than in the control samples. Moreover, the mechanical properties of the samples using plastic waste (except PET) were nearly as good as those of the control samples. The results indicate that PP and PS wastes can be considered for use in the reinforced HDF production process, with different mixture ratios for different usage areas.

19

Mechanical and physical properties investigation of polyurethane material obtained from renewable natural source

80%

Santos dos D. J. , Tavares L. B. , Batalha G. F.

Journal of Achievements in Materials and Manufacturing Engineering

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2012

|

tom Vol. 54, nr 2

211--217

EN

Purpose: The purpose of this paper is to investigate the influence of different polyol/diisocyanate ratios on the mechanical and physical behaviours of polyurethane based polymers. Design/methodology/approach: Castor oil was mixed, as polyol, to diisocyanate in order to obtain polyurethane based polymers. Besides the ideal stoichiometry, polyol/ diisiocyanate ratio, ratios with excess/ lack of diisocyanates were provided. The mechanical behaviour was investigated by uniaxial tests. Differential Scanning Calorimetry (DSC) and Thermo gravimetric Analysis (TGA) were used to investigate the thermal behaviour. The various polymeric structures, obtained by the different ratios, were analysed and compared by Infrared Spectroscopy (IR). Findings: Mechanical performance was increased proportionally to contend of diisocyanate. High levels of diisocyanate have generated elongation decreasing and CO2 formation during curing, damaging mechanical behaviour due to bubble presence. Analytical experiments have showed important changes on: polymeric structures, glass transition temperatures and behaviour at elevated temperatures. Research limitations/implications: Free acid and water contend were not taken into consideration by defining the ideal stoichiometry. The investigated formulations cannot be direct applied on practical applications; fillers and additives must be added to them, which were not taken in consideration. Practical implications: The obtained results can support development of adhesives, engineering polymers and polymeric matrix for structural composites. Stabling the relation between component ratios to their behaviours is possible to define optimal performance ranges and to avoid excess of diisocyanate on polymers. Originality/value: Deep investigation of PU based material, obtained from renewable natural source (castor oil). The results can orientate development of materials for industrial applications and researches using other oils as polyol.

20

Structure and properties changes of Fe78Si9B13 metallic glass by low-temperature thermal activation process

80%

Griner S. , Babilas R. , Nowosielski R.

Journal of Achievements in Materials and Manufacturing Engineering

|

2012

|

tom Vol. 50, nr 1

18--25

EN

Purpose: The paper presents a structural relaxation process of Fe78Si9B13 metallic glasses and structure and properties changes in a temperature range up to 300°C after annealing from 2 to 16 hours. Design/methodology/approach: The relaxation and crystallization of Fe78Si9B13 metallic glasses were examined by mechanical test, relaxation test, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. Findings: The influence of thermal activation on the structural relaxation process of Fe78Si9B13 metallic glasses was determined after annealing from temperature of 100 to 300°C. The beginning of the structural relaxation was revealed after annealing at 100 and 150°C, especially after long annealing times of 8 and 16 hours. The structural relaxation process was confirmed by examination of dimensional changes of samples associated with partial reduction of free volume and the ordering of topological and chemical structure of metallic glass. Significant changes in the structure and properties of the alloy was observed after annealing at 300°C. The reduction of tensile strength and high fragility of samples was also determined. This decrease is associated with extending of the structural relaxation and beginning of crystallization process by formation of small crystallites of α-Fe phase in amorphous matrix. Research limitations/implications: The structural relaxation process and beginning of crystallization on changes of strength, ductility, fracture morphology, structure, process of stress relaxation and geometry of studied alloy were also achieved in function of temperature and time of annealing. Practical implications: The course of relaxation processes can be used for analysis of thermal stability of metallic glasses. Originality/value: The paper presents a significant influence of low-temperature thermal activation, which was conducted up to 16 hours, on the structural relaxation and changes of selected mechanical properties.