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- W2064578314 abstract "Abstract Unlike compacts of pure ceramics and cermets used extensively in a variety of industrial applications, including sophisticated parts of internal combustion engines and gas turbines, plastics-whether moulded or compacted - have not been utilised as machine- or plant-components. Because of their usually low thermal conductivity and low volume resistivity they are generally regarded as thermal and electrical insulators rather than as industrially viable materials. These limitations are fully recognised and consequently a considerable amount of research has been conducted with a view to extending the scope of polymeric materials. Combinations of polyesters, polycarbonates, polyethylenes and polypropylenes with metallic or non-metallic additives incorporated directly into the polymer chains or used as “fillers”, have produced partially conductive, “semi-insulating” materials with, often, pre-oriented stress properties. However, thorough mixing is possible only if particulate matter is used, and satisfactory results are obtained only when the subsequent compacting process leads to a high degree of consolidation. Although solid-phase static compaction gives high densities at low compacting rates, the pressures generated lie in the low range of 200 to 500 MPa, which precludes the inter-particle bonding necessary for high strength of the compact. This latter property can only be generated by a dynamic compacting process involving the creation and passage of a shock wave, under which circumstances, integrally bonded compacts can be produced. These fall into the four main groups of polymer/polymer aggregates, polymer matrix/ceramic mixtures (developed with a view to enhancing anti-wear and lubrication properties), polymer matrix/metallic composites of interest in the electronic industry, and polymer/chemical powder compacts having potential use in bioengineering applications. Of these, the metallic-content aggregates, with either retained polymeric matrix, or eventually freed of it to exist as a “sponge”-like structure, are of considerable interest and consequently some indication of their likely properties is provided here." @default.
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- W2064578314 date "1989-03-01" @default.
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- W2064578314 title "Properties of particulate PVC-metallic explosively compacted aggregates" @default.
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- W2064578314 doi "https://doi.org/10.1016/0378-3804(89)90090-9" @default.
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