Properties of materials produced by extruding and sintering plasticized powder mixtures
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A study was made of the sintering of porous specimens obtained by extruding plasticized mixtures of carbonyl nickel and electrolytic copper powders. It is demonstrated that, in the presence of reaction with the plasticizer, the sintering kinetics of the specimens are similar to those for loosely poured specimens and high-porosity compacts.
The sintering quality of the specimens was evaluated from their electrical resistivity. The harmful influence of the carbon from the plasticizer on the sintering of copper specimens was confirmed.
The tensile strength of specimens was measured and found to be in good agreement with data obtained with the aid of the statistical theory of strength of porous materials. The maximum strength was 280 MN/m2 (28.6 kg/ mm2) for the nickel specimens and 75 MN/m2 (7.65 kg/mm2) for the copper specimens.
A study of the microstructures of the specimens demonstrated that the particle size of the starting powders and their reaction with the plasticizer exert a substantial influence on the resulting porosity, pore size, and character of pore distribution. Large powder particle size together with the harmless influence of plasticizer during sintering results in the formation of large, branched pores, many of which are of the open type.
KeywordsTensile Strength Electrical Resistivity Powder Particle Powder Mixture Open Type
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