Influence of Particle Size on the Electrical Resistivity of Compacted Mixtures of Polymeric and Metallic Powders
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- Angelos Malliaris
- Department of Metallurgical Engineering, Drexel University, Philadelphia, Pennsylvania 19104
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- D. T. Turner
- Department of Metallurgical Engineering, Drexel University, Philadelphia, Pennsylvania 19104
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<jats:p>Powder samples of high-density polyethylene and nickel of particle sizes Rp and Rm, respectively, were mixed and compacted at room temperature under a pressure of 1000 kg/cm2. Microscopic examination of polished sections of the compact, by reflected light, showed that the metallic particles did not penetrate the polymeric particles and that this resulted in a segregated distribution of metallic particles at high ratios of Rp/Rm. The electrical resistivity of the compacts had a value of 1016 Ω cm unless the composition of metal reached a critical value, beyond which the resistivity decreased markedly by as much as twenty orders-of-magnitude. This critical composition was found to decrease with an increase in the ratio Rp/Rm throughout the range studied of from 1 to 16. The general features of the dependence of electrical resistivity on composition of metal could be rationalized by reference to a model according to which small particles of nickel form a monolayer on the large particles of polymer in the mixture of powders. This arrangement was supposed to be but little changed during compaction and to result in a segregated distribution of metal which can be visualized as approximating to the accommodation of metallic particles on three mutually perpendicular sets of lattice planes. The critical composition for a sudden decrease in electrical resistivity was assumed to correspond to the first nonzero probability for infinitely long chains of contiguously occupied lattice sites.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 42 (2), 614-618, 1971-02-01
AIP Publishing
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詳細情報 詳細情報について
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- CRID
- 1362262945534676480
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- NII論文ID
- 30015891351
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- NII書誌ID
- AA00693547
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- ISSN
- 10897550
- 00218979
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