Wyniki wyszukiwania - BazTech

1

Mikropalniki zimnej plazmy : nowa generacja reaktorów do chemicznej obróbki powierzchni

Tyczkowski J., Kapica R., Markiewicz J., Tyczkowska-Sieroń E.

Przemysł Chemiczny

|

2013

|

T. 92, nr 12

2339- 2344

PL

Omówiono nowe mikropalniki zimnej plazmy pracujące pod ciśnieniem atmosferycznym. Szczególną uwagę zwrócono na rozwiązania z wyładowaniem jarzeniowym typu RF, takie jak “igła plazmowa” oraz opracowana i opatentowana ostatnio przez nas “żyletka plazmowa”. Przedstawiono dwa przykłady zastosowań mikroplazmy do obróbki materiałów: w zakresie inżynierii polimerów oraz inżynierii biomedycznej. W pierwszym przykładzie omówiono modyfikację powierzchni elastomerów typu SBS, służącą znacznej poprawie zdolności klejenia tych materiałów, w drugim pokazano działanie mikroplazmy na mikroorganizmy, takie jak komórki grzybów Candida albicans.

EN

A review, with 34 refs., of new constructions and uses of cold plasma jets for rubber surface modification and for disinfection of materials.

2

Simulation diagnostics of the polyester-glass pipes degradation process; experimental basis

Szymiczek M., Wróbel G., Rojek M., Czapla T.

Journal of Achievements in Materials and Manufacturing Engineering

|

2013

|

Vol. 59, nr 1

37--47

EN

Purpose: In the work is described the method that enables identification of controller of simulation procedures which ensures compliance of experimental research results of changes in material physical characteristics with the characteristics of the numerical model. Design/methodology/approach: The work presents the method of diagnostic assessment of residual strength of composite pipes produced with the use of the method of winding glass fibre impregnated by chemically setting polyester resin, subjected to fatigue load in condition of pulsating fluid pressure. Findings: The basis of assessment is the correlation of residual strength with the acoustic characteristics of composite coating of the researched pipes. Research limitations/implications: The parameters of simulation procedures which are of key importance for correctness of diagnosis were determined on the basis of results of non-destructive and destructive testing of pipe material samples, subjected to the load in conditions corresponding the working ones. Practical implications: The diagnostic tool is the simulation program of degradation process of composite material with set structure, which enables investigating the changes in material characteristics for any operating load program. Originality/value: The paper presents a new approach to diagnostic processes of destruction aging-fatigue for the purpose of assessing the residual strength of composite pipes using computer simulation methods.

3

Thermal conductivity of the epoxy resin filled by low melting point alloy

Wierzbicki Ł., Pusz A.

Archives of Materials Science and Engineering

|

2013

|

Vol. 61, nr 1

22--29

EN

Purpose: The aim of the work was to determine the effectiveness of the modification of epoxy resin’s thermal conductivity by Wood’s alloy particles addition. Design/methodology/approach: The manufacturing method of thermosetting polymer matrix composite materials reinforced with the Wood’s alloy particles was searched. Firstly, the mixing conditions were differentiated to obtain good dispersion of the reinforcement in polymeric matrix. The thermal conductivity coefficient of composites has been investigated by using of the quasi-static test. Findings: The suggested method of thermal conductivity measurement allows to avoid the procedure of solving complicated equations. The developed measuring device enables the measurements of thermal conductivity of polymer composites in a form of a beam of 4x20X120 mm dimension. The results of the thermal conductivity tests and their analysis are presented. Research limitations/implications: The presented research was limited to composites in the form of small samples. The developed technology of this type of composites’ preparation is limited to small volumes because of the sedimentation process. The second limitation results from the necessity of matching the shape of the test specimen to the size of the cooler and heater on the device for measuring thermal conductivity. Practical implications: Materials with low melting point alloy content show many possible applications. First of all, these are the materials of higher thermal conductivity and electrical conductivity than the standard polymeric materials. Originality/value: The preparation method of thermosetting polymer matrix composite materials reinforced with the Wood’s alloy particles fabricating method was developed. Composites with good thermal properties were obtained. The obtained results confirm the utility of the applied investigation methods in the thermal analysis of polymer composites.

4

Polymer nanocomposites reinforced with montmorillonite

Dobrzański L. A., Bilewicz M., Viana J.C.

Archives of Materials Science and Engineering

|

2012

|

Vol. 53, nr 1

5-28

EN

Purpose: Light microscope with polarized light has been used for observation layered zone, visible thanks to polarization of the light, inside polymer-polymer composites and nanocomposites Aim of work has been concentrated on investigation of nanocomposites as promising engineering materials, basing on composition of polypropylene and montmorillonite as reinforcement in the shape of nanoparticles of 2:1 silicate. Design/methodology/approach: Conventional and non-conventional injection molding process has been used for obtaining nanocomposites. In non-conventional process has been used the special mold for inducing the shear rates, additionally equipped with external computer to control melt manipulation of solidifying polymer inside mold cavity Findings: Highly developed structure consisted of multilayer zone between skin and core mainly responsible for reinforcement and improvement of fracture toughness of polymer composites and nanocomposites Research limitations/implications: Nanocomposites of polymer blends and montmorillonite were moulded by direct injection moulding according to melt temperature and stroke time-number combination included in design of experiments. Practical implications: Application of special injection moulding technique provides to structure development and gives possibility to create multilayer zone, which strengthen material. Besides strengthening obtaining of such nanocomposites is cheap thanks to application of low cost injection moulding technique and not expensive polyolefines with developed structure, without using additional fillers (e.g. compatybilizers). Originality/value: Very wide application of polymer composites and nanocomposites as engineering materials used for various industries like building engineering, automotive and aerospace

5

Mechanical and chemical properties of sewage pipes

Wierzbicki Ł., Szymiczek M.

Archives of Materials Science and Engineering

|

2012

|

Vol. 53, nr 1

38-45

EN

Purpose: The purpose of this paper was to evaluate the compatibility of the physico-chemical properties of sewage pipes with the requirements of PN – EN ISO 1401-01: Plastics piping systems for non-pressure underground drainage and sewerage. This article is based on a research carried out for the water supply company. The article presents the results of mechanical and chemical testing of four pipes of unplasticized polyvinyl chloride and one pipe of polypropylene. All the test pipes were applicable to the sewage systems. The aim of the article was to confirm the high property thermoplastic pipes in comparison with conventional sewage system. High property mainly resulting from the flexibility of thermoplastic pipe compared to conventional rigid pipes sewers. Plastic piping systems also offer a reliable method for joining technology. Design/methodology/approach: The subject of the study was the analysis of the macrostructure, the analysis of the mechanical and chemical properties of sewage thermoplastic pipes. The research was based on international and national standards for pipes made of thermoplastics pipes and sewage systems. During the tests we measured density, ring stiffness, longitudinal shrinkage, additional weight impact resistance and chemical resistance to dichloromethane. Findings: The standards and literature provide the average density for the pipes with PVC-U of 1.4 g/cm3. The research has shown that the material of all the tested PVC-U sewage pipes exceed this value. The highest specific density is 1.555 g/cm3, which may indicate the use of large quantities of fillers. Research limitations/implications: The main limitation of the experiment was a failure to compare the properties of samples from the properties of the pipes after long time use. When considering suggestions for future research, there should be carried out spectroscopic tests. FTIR spectrum would allow to verify that the plastic was added fillers. Practical implications: The research shows that more frequent inspections are necessary. These inspections should include execution of pipeline technology, but also controls the material from which pipes are produced. Originality/value: The advantage of the article are the results of the comparative analysis of a few mechanical tests and chemical resistance. The value of this article is to draw attention to the need for studies of thermoplastic pipes for sewage systems. The installation of thermoplastic pipes shows less damage, but it should not cause non-compliance with standard specifications.

6

Non-standard test methods for long-fibrous reinforced composite materials

Dobrzański L. A., Nowak A., Błażejewski W., Rybczyński R.

Archives of Materials Science and Engineering

|

2011

|

Vol. 47, nr 1

5-10

EN

Purpose: The investigations serve as comparative verification of silicone-aramid material designed for oesophageal prosthesis. Design/methodology/approach: In this work, non-standard research techniques, particularly designated for comparative tests of long-fibrous composite materials, are presented. Those tests are carried out on equipment similar to so called NOL rings test and pressure tests using rubber as a working medium Findings: During interpretation of pressure tests results according to the proposed method, it should be paid attention to the state of stresses in the wall of investigated tubular element. Ignoring fractional resistance of the rubber with sample wall, it can be obtained uniaxial stress in circumferential direction. Research limitations: Proposed research methods (non-standard NOL rings and tests using axial compressed rubber) can be applied in evaluation of fabricated long-fibrous material, e.g. determination of degree of silicone material binding. Originality/value: Proposed methods of comparative tests are easy to make and the destruction point during static tests as well as fatigue ones is clearly determined. Results of investigations serve as comparative verification of silicon-aramid material designed for oesophageal prosthesis. Tested tubular element - prototype of oesophageal prosthesis requires the reduction of reinforcing material.

7

Epoxy resins and low melting point alloy composites

Stabik J., Wierzbicki Ł.

Archives of Materials Science and Engineering

|

2011

|

Vol. 48, nr 1

5-11

EN

The goal of this work was to describe manufacturing process of polymer matrix composite materials reinforced with Wood’s alloy particles and to observe changes of structure.

8

Constructional model of internal oesophageal prosthesis

Dobrzański L. A., Pusz A., Nowak J., Górniak M.

Archives of Materials Science and Engineering

|

2010

|

Vol. 42, nr 2

69-76

EN

Purpose: The aim of this work is to study of constructional model of internal prosthesis of oesophagus with determined functional features; the prosthesis will replace the upper part of the digestive system – the oesophagus. Design/methodology/approach: Constructional model of internal prosthesis of oesophagus was worked out in the basis of physiological build of oesophagus considering surgical techniques. Findings: Development of optimal constructional model of internal prosthesis of oesophagus considering functional features and surgical techniques. Research limitations/implications: Developed constructional model of modern, internal prosthesis of the human oesophagus will be used to design the manufacturing technology and to manufacture given prosthesis. Originality/value: Worked out construction is the part of the research project realized by authors, that will result in cognitive, constructional and technological effects, but first of all, it will enable the real help very sick people.