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1
Content available remote Electrical and tribological properties of gradient epoxy-graphite composites
100%
Stabik J. , Dybowska A.
Journal of Achievements in Materials and Manufacturing Engineering
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2008
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tom Vol. 27, nr 1
39-42
EN
Purpose: The goal of this work was to use gravity casting as a method to prepare composite material that is characterized by gradient of electrical and tribological properties. Furthermore electrical and tribological properties of composites filled with two different kinds of graphite were compared. Design/methodology/approach: In this research the method of preparing polymeric gradient composites was gravity casting. The experimental procedure focused on evaluating the electrical resistivity and coefficient of fraction (by the pin-on-disc method) of gradient composites. Findings: Gravity casting method allowed to obtain materials with different percentage of graphite content in subsequent layers of composite. Moreover it was observed that values of coefficient of friction were higher for composite with SV94 graphite than for composite with PV60/95. Research limitations/implications: The main problem for this work was to obtain continuous change of properties depending on the distance from surface. The particle's diameter distribution, shape and size of reinforcement were significant in manufacture of composites and influenced gradient of tested properties. Practical implications: Method applied in this research allowed to obtain materials that are characterized by gradient of electrical and tribological properties. Such composites find applications in electrical industry and in mechanical engineering. Originality/value: New polymeric gradient materials were developed using gravity casting technique. Electrical and tribological properties of these composites were determined depending on distance from the surface of the test piece.
2
Content available remote Influence of graphite on electrical properties of polymeric composites
80%
Szczepanik M. , Stabik J. , Łazarczyk M. , Dybowska A.
Archives of Materials Science and Engineering
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2009
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tom Vol. 37, nr 1
37-44
EN
Purpose: of this work was to prepare polymeric composite materials with different contents of graphite and to search the influence of graphite on electrical properties of these materials. Design/methodology/approach : Five specimens were prepared using gravity casting method. Composites with epoxy resin as a matrix and with respectively 3, 6, 9 and 12%vol of graphite PV60/65 as a filler were cast. Surface resistivity was applied as a measure of electrical properties. The idea of the test was to define electrical resistivity in sequential layers with different content of conductive component (graphite). First, specimen's thickness was measured and electrical resistivity was tested. Next, outer layer was removed by grinding and electrical measurements performed. The procedure was repeated for all subsequent layers. In effect surface and volume resistivity dependence on depth of the layer was determined. Findings: The experimental results demonstrated that addition of conductive filler (graphite) to epoxy resin caused change of surface and volume resistivity of these materials. Research limitations/implications: Further investigations with higher carbon content and/or with different matrix are needed. Practical implications: Addition of 3-6%vol. of graphite to epoxy resin caused limited, almost linear, decrease of surface resistivity in depth direction of specimens. Higher content of filler (9-12%vol) in polymeric composite caused rapid, non-linear with layer depth, decrease of surface and volume resistivity. Originality/value: This paper is original because in the research programme gravitational casting was used to prepare polymeric composite materials with gradient of electrical properties.
3
Content available remote Electrical properties of polymeric gradient materials based on epoxy resin filled with hard coal
80%
Stabik J. , Szczepanik M. , Dybowska A. , Suchoń Ł.
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tom Vol. 38, nr 1
56-63
EN
Purpose: of this paper was to describe functionally the gradient polymeric materials and technology of the gradient production. The experimental part describes preparation of circular disc samples of polymeric gradient material by gravity casting method. Finally electrical surface resistance and surface resistivity was measured and analysed. Design/methodology/approach: Eight specimens were prepared using gravity casting method. Composites with epoxy resin as a matrix and with respectively 3, 6, 9 and 12%vol of two types of hard coal as a filler were cast. Surface resistivity was applied as a measure of electrical properties. The idea of the test was to define electrical resistivity in sequential layers with different content and type of conductive component (hard coal). First, specimen’s thickness was measured and electrical resistivity was tested. Next, outer layer was removed by grinding and electrical measurements performed. The procedure was repeated for all subsequent layers. In effect, dependence of surface resistivity on depth of the layer was determined. Findings: The experimental results demonstrated that addition of conductive filler (hard coal) to epoxy resin caused a change of surface resistivity of these materials. Hard coal together with epoxy resin formed gradient composite material with different filler content in subsequent layers. Research limitations/implications: Further investigations with higher hard coal content and/or with different matrix are needed. Originality/value: This paper is original because in the research programme electrical properties of new type of polymeric gradient composites were tested and presented in it.
4
Content available remote Wytwarzanie materiałów gradientowych technologiami przetwórstwa tworzyw polimerowych
80%
Stabik J. , Chomiak M. , Dybowska A. , Suchoń Ł.
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tom [R.] 17, nr 3
221-225
PL
W artykule przedstawiono możliwości wykorzystania technologii przetwórstwa tworzyw polimerowych do wytwarzania materiałów gradientowych. Na wstępie krótko scharakteryzowano polimerowe materiały gradientowe a następnie przedstawiono wybrane technologie ich wytwarzania. Uwagę skupiono na takich technologiach jak odlewanie swobodne, odlewanie odśrodkowe, prasowanie, współwytłaczanie oraz polimeryzacja "in situ". Podano również przykłady wytworzonych materiałów i możliwości ich wykorzystania.
EN
The paper presents possibilities of application of plastics processing technologies to graded materials manufacturing. At the beginning Polymer Graded Materials (PGMs) are shortly characterized, next chosen technologies of their manufacture are presented. Attention is focused on such technologies as casting, centrifugal casting, pressing, co-extrusion and "in situ" polymerization. Examples of ready Polymer Gradient Materials and possibilities of their applications are also presented.
5
Content available remote Magnetic properties of polymer matrix composites filled with ferrite powders
80%
Stabik J. , Chrobak A. , Haneczok G. , Dybowska A.
Archives of Materials Science and Engineering
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2011
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tom Vol. 48, nr 2
97-102
EN
The aim of this paper was to present magnetic properties research results of polymer matrix composites. The influence of the kind of fillers and amount of fillers on the magnetic properties of the composites was studied and is presented in this paper.
6
Content available remote Magnetic induction of polymer composites filled with ferrite powders
70%
Stabik J. , Dybowska A. , Pluszyński J. , Szczepanik M. , Suchoń Ł.
Archives of Materials Science and Engineering
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2010
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tom Vol. 41, nr 1
13-20
EN
Purpose: The goal of this work was to determine influence of amount and type of ferrite fillers on magnetic induction of epoxy composites. Six mixtures that contain different amount of ferrite powder were prepared. Additionally an effect of type and amount of introduced ferrite powder on epoxy resin processing conditions and parameters was searched. Design/methodology/approach: In this research the method of preparing polymeric gradient composites was centrifugal casting. The experimental procedure focused on evaluating the magnetic induction of gradient composites. Magnetic induction of composites based on epoxy resin, which contain ferrite powders was measured using milliteslometer. Measurements were performed for three filler contents and for two types of filler. Findings: Centrifugal casting method allowed obtaining materials with different percentage of ferrite content in subsequent layers of cylindrical composites. Moreover it was observed that values of magnetic induction were higher for composite with barium ferrite than for composite with strontium ferrite but the difference was not too high. Research limitations/implications: The main problem of this work was about limitation of maximum level of fillers content. Adding more filler than 30%vol caused very rapid composite viscosity increase and made air removing and casting impossible. For that reason there were made composites with 10%vol., 20%vol. and 30%vol. of ferrite powders. Trials were performed with mixtures that contained up to 50%vol. of filler. Practical implications: Method applied in this research allowed to obtain materials that are characterized by gradient of magnetic properties. Such composites find applications in electrotechnical industry and in mechanical engineering. Originality/value: New polymeric gradient materials were developed using centrifugal casting technology. Magnetic properties of these composites were determined depending on distance from the surface of the test piece.
7
Content available remote Chosen manufacture methods of Polymeric Graded Materials with electrical and magnetic properties gradation
70%
Stabik J. , Chomiak M. , Dybowska A. , Suchoń Ł. , Mrowiec K.
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2012
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tom Vol. 54, nr 2
218--226
EN
Purpose: The purpose of the paper is to present main results of Polymeric Graded Materials (PGMs) investigations realized in Silesian University of Technology, Division of Metallic and Polymeric Materials Processing. Methods of PGMs manufacture with electrical and magnetic properties gradation are mainly discussed. Design/methodology/approach: In short introduction general remarks on functionally graded materials (FGMs) and PGMs are presented. Next, methods used to prepare PGMs are presented together with physical basics determining composition, structure and properties gradation. Research methodology and chosen results showing PGMs structure and properties are also presented. Findings: Achieved results show that it is possible do design graded material structure and composition and to manufacture PGM that not precisely but in high extend meets designed requirements. The basic condition to accomplish this task is that physical basics of structure and composition gradient formation are known and relations between technological process parameters and ready material characteristics are properly applied. Research limitations/implications: Only chosen methods of PGMs manufacture are presented and only chosen PGMs characteristics are discussed. Practical implications: Presented technologies are widely used in industry to processing polymeric materials. Defined changes in parameters and properly designed composition will allow to utilize these technologies to PGMs manufacture. Ready parts with properties gradation may be applied in almost all industry branches. Few possible applications are presented in the text. Originality/value: New types of PGMs are described in the paper. Attention is paid mainly to materials with gradation of electrical and magnetic properties. The paper may be interesting for scientists involved in PGMs and for industry engineers looking for materials with electrical and magnetic properties gradation.
8
Content available Magnetic properties of polymer matrix composites filled with ferrite powders
70%
Stabik J. , Chrobak A. , Haneczok G. , Dybowska A.
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