Wyniki wyszukiwania - BazTech

1

Wybrane kierunki zastosowań sztucznych sieci neuronowych we włókiennictwie

Lewandowski S., Drobina R., Grecka A.

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2016

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nr 8

35--40

EN

The article presents the general trends of application of artificial neural networks. It presents some examples of applications of artificial neural networks in the textile industry, including forecasts of selected mechanical properties of filament yarns spun from the melt, the classification of damage of card web, the control of regularity of linear mass of draw sliver, assessment the quality of yarn packages textured by false twist and predict the physical properties of unknot-ted spliced ends of wool worsted yarns.

2

Properties ribbon amorphous Fe73Ti5Y3B19 and Fe73Co5Y3B19 produced by melt-spinning

Zdrodowska B., Kwarciak P., Szota M., Nabiałek M.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 1

20--28

EN

Purpose: The purpose of the study is to examine the mechanical properties of Fe73Ti5Y3B19, and Fe73Co5Y3B19 alloys and to carry out the comparative examination of the bright side of these alloys. Design/methodology/approach: The Fe73Ti5Y3B19, Fe73Co5Y3B19 alloys were produced by the melt-spinning method. This method involves rapid cooling of the metal on a spinning copper cylinder. The cooling rate required for obtaining the amorphous alloy ranges from 105 to 106 K/s. The above-mentioned method is popular and often used; however, in order to obtain alloys of an amorphous structure, its should assured that the conditions for obtaining amorphous materials, as set by A. Inoe, are satisfied. Findings: Mechanical properties, such as microhardness, roughness, abrasive wear with the use of a ball tester, have been described and the X-ray diffraction has been determined in the paper. Research limitations/implications: The effect of the investigation are differences in mechanical properties found between the examined alloys. Practical implications: The amorphous Fe73Ti5Y3B19, Fe73Co5Y3B19 alloys find application in the power industry, where there are used for transformer cores.

3

Properties of Fe73Ni5Y3B19 amorphous ribbon produced by melt-spinning

Zdrodowska K., Kwarciak P., Szota M., Nabiałek M.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

381--387

EN

Purpose: The purpose of the study is to examine the mechanical properties of Fe73Ni5Y3B19, alloy and to carry out the comparative examination of matt and glossy sides of those alloys. Design/methodology/approach: The Fe73Ni5Y3B19, alloy have been produced by the melt-spinning method which involves rapid cooling of the metal on a spinning copper cylinder. The cooling rate has required for obtaining the amorphous alloy ranges from 10 5 to 106 K/s. The above-mentioned method is popular and often used; however, in order to obtain alloys of amorphous structure, it should be assured that the conditions for obtaining amorphous materials, as set by A. Inoe, are satisfied. Findings: Mechanical properties, such as microhardness, roughness, abrasive wear with the use of a ball tester, have been described and the X-ray diffraction has been determined in the paper. Research limitations/implications: Analyzed modernization of the machine refers to pin on disc, disc-disc, block and disc unit sliding friction processes. Practical implications:The Fe73Ni5Y3B19 amorphous alloys find the application in the power industry, where they are used for transformer cores.

4

Method of continuous casting of amorphous metallic materials based on iron

Jeziorski L., Nabiałek M. G., Szota M., Dośpiał M.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 4

69-72

EN

In this article, one of the production method of Fe based amorphous metallic materials, exhibiting excellent soft magnetic properties was described. The presented method consists in the unidirectional casting of the liquid alloy on to rotating, at high frequency, copper wheel. The produced samples had a ribbon shape with a thickness of about 45 microns. Apply this method allows to obtain materials exhibiting the lack of long-range ordering between the atoms and characterized by unique magnetic and mechanical properties. The structure of produced samples was investigated using Mössbauer spectroscopy and X-ray diffraction. The saturation magnetization [...] and coercivity field (Hc) of ribbons in the as-cast state, have values corresponding to materials, with good soft ferromagnetic properties. On the basis of structural and magnetic investigations, it was found that the obtained samples were amorphous and had very good magnetic properties. That allows us to think, that the presented method makes it possible to fabricate the amorphous materials, characterized by the good electrotechnical parameters.

5

Formowanie włókien z terpoli(estro-etero-estrów) metodą przędzenia ze stopu lub elektroprzędzenia z roztworu

Zdebiak P.

Polimery

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2008

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T. 53, nr 7-8

581-586

PL

Otrzymano nowe terpoli(estro-etero-estry) (TEEE) zbudowane z segmentów sztywnych tworzonych przez poli(tereftalan butylenu) (PBT) oraz segmentów giętkich budowanych przez reszty kwasu dilinoleinowego (DLA) i poli(glikolu etylenowego) (PEG) o różnym ciężarze cząsteczkowym. Z wytworzonych materiałów formowano włókna metodą przędzenia ze stopu oraz elektroprzędzenia z roztworu. Zbadano wpływ ciężaru cząsteczkowego PEG, udziału organicznego stabilizatora termicznego - ?-tokoferolu (VE), a także modyfikatora nieorganicznego - hydroksyapatytu (HAP) na wskaźniki szybkości płynięcia (MFR) oraz właściwości mechaniczne i włóknotwórcze TEEE. Metodą przędzenia ze stopu uformowano mikrowłókna hybrydowe z zastosowaniem układu zawierającego nanokrystaliczną ceramikę HAP. Stwierdzono, że ma ona podobne właściwości stabilizujące termicznie materiał jak VE. Terpolimery uzyskane z udziałem PEG o większym ciężarze cząsteczkowym (PEG4600) charakteryzowały się bardzo dobrymi właściwościami mechanicznymi, uformowane zaś z nich włókna odznaczały się doskonałą elastycznością (duże wartości powrotów elastycznych).

EN

Novel terpoly(ester-ether-ester)s (TEEE) built of hard segments, formed by poly(butylene terephthalate) (PBT), and soft blocks built of dilinoleic acid (DLA) residues and poly(ethylene glycol) (PEG) of different molecular weights (Table 1) were prepared. The fibers were prepared from the materials obtained using the methods of melt spinning or electrospinning from the solution (Fig. 1 and 5). The effects of PEG molecular weight and addition of organic thermal stabilizer (alfa-tocopherol, VE) as well as of addition of inorganic modifier (hydroxyapatite, HAP) on melt flow rate (MFR) (Fig. 2) and on mechanical (Fig. 3) and fiber-forming properties of TEEE were studied. Hybrid microfibers were prepared by melt spinning from the system containing HAP nanocrystalline ceramics. It was found that this ceramics thermally stabilized the material similarly as VE did. Terpolymers prepared from PEG of higher molecular weight (PEG4600) showed very good mechanical properties and fibers prepared exhibited excellent elastic properties (high values of elastic recovery, Table 2).

6

The microstructure and properties of a new Fe41Ni39P10Si5B5 glass forming alloy

Ziewiec K., Bryła K., Ziewiec A., Prusik K.

Archives of Materials Science and Engineering

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2008

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Vol. 34, nr 1

35-38

EN

Purpose: The aim of the work was to investigate the microstructure, thermal stability and some mechanical properties of a new Fe41Ni39P10Si5B5 glass forming alloy. Design/methodology/approach: A five component Fe41Ni39P10Si5B5 alloy was produced using arc melting in argon protective atmosphere from of pure elements 99.95 wt. % Fe, 99.95 wt. % Ni, 99,999 wt. % Si and Fe-P, Fe-B, Ni-P, Ni-B master alloys. The alloy was melt spun. The microstructure of the arc melted droplet is investigated in scanning electron microscope with EDS. The melt spun ribbon was investigated by X-ray diffraction, micro-hardness measurement, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC) and the microstructure of the melt spun ribbon at the beginning of crystallization process was observed using high resolution transmission electron microscope (HRTEM). Findings: The arc-melt alloy consisted of four phase constituents that provided amorphization during the melt spinning process. The alloy has relatively high hardness of 720HV and the elastic modulus on the level of 102 GPa. The elastic modulus is stable up to ca. 500 K and after it shows glass transition at 603 K. Crystallization causes temporary increase of the elastic modulus and finally causes brittleness of the sample. The crystallization was found to have the two stages and it begins with formation of bcc iron-base nano-metric crystals. Research limitations/implications: It has been shown that the multi-component Fe-Ni-P-Si-B system provides the multiphase composition and enables relatively easy amorphization of the Fe41Ni39P10Si5B5 alloy through the melt-spinning method. It is also possible to control the microstructure and the mechanical properties through the appropriate heat treatment. The existence of glass transformation in the alloy provides possibility of consolidation non-bulk material into a bulk sape. Practical implications: The work reports about the glass forming alloy of relatively good mechanical properties produced from a low-cost commercial purity precursors. The future investigations on the alloy can provide the basis to the processing and manufacturing soft-magnetic bulk parts of a very low coercivity. Originality/value: The study provides an original information about the primary structure of the arc-melt Fe41Ni39P10Si5B5 alloy as well as about the microstructure, mechanical properties and thermal stability of meltspun ribbon.

7

The microstructure and mechanical properties of Ni78Ag2P20 alloy

Ziewiec K., Dutkiewicz J., Ziewiec A., Kąc S.

Archives of Materials Science and Engineering

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2007

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Vol. 28, nr 11

657-660

EN

Purpose: The aim of the work was to investigate the influence of silver as a modifying constituent on structure formation in Ni-P based glass forming matrix and to characterize mechanical properties of the alloys. Design/methodology/approach: Nickel-silver-phosphorus Ni78Ag2P20 alloy was produced using arc melting in argon protective atmosphere from commercial powders. The alloy was melt spun. The microstructure of the arc melted droplet is investigated in scanning electron microscope with EDS and micro-hardness tester and the melt spun ribbon is investigated using light microscope and transmission electron microscope. Then the mechanical properties are evaluated with use of micro-hardness measurements. Findings: A strong tendency for demixing of Ni-P-rich and Ag-rich liquids is observed leading to formation of the primary structure consisting of slightly hypo-eutectic Ni-P-rich regions and Ag rich regions. The melt spinning process produced the amorphous Ni-P and Ag-rich crystalline structure. The alloys hardness and elasticity modulus were characterized. The melt spun ribbons are slightly softer than the crystalline Ni-P regions. In case of the melt spun ribbons, a softening influence of silver was observed giving the lower hardness for Ni78Ag2P20 than Ni80P20. The alloy constituents in a bulk crystalline state present the higher values of elasticity modulus when compared to the melt spun ribbons. Research limitations/implications: It has been shown that the criterion of a high positive values of mixing enthalpies can be applied to design the materials that should separate before the solidification to form a hard glassy matrix/soft crystalline composite. The amorphization of the crystalline Ni-P-based alloys can lead to formation of more flexible materials with a lower elasticity modulus and lower hardness. Practical implications: The main limits for application of the glassy alloys are the high prices of the materials used for alloying and the low plasticity of the amorphous metals. Therefore, the work provides the alloy produced from a low-cost commercial purity precursors that are able to form a glassy matrix composite with a crystalline soft particles included. The future works on the development of the idea can lead to a successful manufacturing of a hard and ductile metallic composite parts. Originality/value: The work delivers a new information on possibility of amorphous/crystalline composite formation starting from Ni Ag P system. This includes the original microstructural and mechanical characteristics of the arc melt and melt spun alloy. The information could be used by researchers for future works on development of Ni-P based composites complementary to the electroless coatings.

8

New Bioactive Synthetic Fibres Developed in the Institute of Chemical Fibres

Struszczyk H., Lebioda J., Twarowska-Schmidt K., Niekraszewicz A.

Fibres & Textiles in Eastern Europe

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2003

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Vol. 11, no. 2 (41)

96--99

EN

We discuss the development of bioactive fibres mainly destined for everyday uses and medical service. We present a survey of anti-bacterial, anti-fungal and anti-mite fibres which are presently available on the market. The results are described of research in the field of manufacturing and marketing anti-microbial fibres conducted at the Institute of Chemical Fibres in Łódź.

PL

Omówiono kierunki rozwoju włókien bioaktywnych z przeznaczeniem głównie na wyroby codziennego użytku i wyposażenie służby zdrowia. Dokonano przeglądu aktualnie wytwarzanych na świecie włókien chemicznych przeciwbakteryjnych, przeciwgrzybowych i przeciwroztoczowych. Zamieszczono wyniki prac i osiągnięcia IWCh w technologii wytwarzania oraz wprowadzania na rynek włókien przeciwmikrobowych.

9

Estimation of glass forming ability of Ni-Ti-Zr system.

Morgiel J., Dutkiewicz J.

Inżynieria Materiałowa

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2001

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R. XXII, nr 5

651-654

EN

The microstructure and phases formed during the melt spinning of TiNiZr alloys from TiNi-NiZr and TiNi-TiNiZr phase diagram sections and TiNiZr-ZrNi-Zr2Ni eutectic were analyzed with TEM, SEM and XRD techniques. Ribbons from NiTi-NiZr sections containing 10 at.% Zr solidified with formation of columnar beta phase grains, while those containing 20 at.% Zr were amorphous with only minor amount of spherical beta phase crystallites. Ribbons from NiTi-NiTiZr section have either beta phase (at 10 at.% Zr) or amorphous (at 20 at.% Zr) matrix, but always with significant amount of other crystalline phases. Melt spinning of ribbons of composition close to the ternary TiNiZr-ZrNi-Zr2Ni eutectic allows also to obtain nearly amorphous ribbons with only small fraction of a metastable crystalline phase. Additionally, it was concluded that a position of ternary eutectic taken from the literature should be corrected toward higher nickel content.

PL

Mikrostruktura i skład fazowy szybkochłodzonych taśm ze stopów TiNiZr z przekrojów TiNi-NiZr, TiNi-TiNiZr oraz odpowiadających eutektyce TiNiZr-ZrNi-Zr2Ni były analizowane technikami skaningowej (SEM) i transmisyjnej (TEM) mikroskopii elektronowej oraz dyfrakcji rentgenowskiej (XRD). Taśmy z przekroju TiNi-NiZr zawierające 10%at. Zr krystalizowały tworząc kolumnową strukturę ziaren fazy beta, podczas gdy stopy z tego samego przekroju, ale o zwiększonej do 20at. % zawartości Zr miały strukturę amorficzną z niewielkim udziałem krystalitów fazy beta. Taśmy o składach z przekroju TiNi-TiNiZr posiadały strukturę albo fazy beta (10 at.% Zr) albo amorficzną (20 at.% Zr) ale zawsze ze znaczącym udziałem innych faz krystalicznych. Stop o składzie odpowiadającym eutektyce potrójnej również umożliwiał uzyskanie prawie całkowicie amorficznych taśm z niewielkim udziałem metastabilnej fazy krystalicznej. Dodatkowo stwierdzono, że pozycja eutektyki potrójnej TiNiZr-ZrNi-Zr2Ni znana z literatury powinna być skorygowana w kierunku wyższych zawartości niklu.

10

Microstructure of annealed Cu-Co alloy bands produced by melt-spinning method.

Ciura F., Figiel H., Wosik J., Knobel M.

Inżynieria Materiałowa

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1998

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R. XIX, nr 3

564-567

EN

The Transmission Electron Microscopy investigations of the Cu90Co10 ribbons are presented and discussed. The ribbons obtained by melt spinning were annealed at 550 degrees centigrade for 1; 2; 4 and 16h. The structure with coherent Co precipitates is observed, and the mean size of the precipitates increases according to ageing time.