Densification of powder compacts by fast pulse heating under pre

Details Densification of powder compacts by fast pulse heating under pre Densification of powder compacts by fast pulse heating under pre

1991-01-10

1992-12-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264102, 264125, H05B 100, B29C 6700

Patent

active

051695723

ABSTRACT:
A process for producing dense bodies from mixtures of materials with significantly different electrical resistivities. A mixture of electrically conducting powder and a dielectric or semiconducting powder is subjected to pressure and an intense electric current pulse of sufficiently short duration such that the heating is largely confined to the material of superior electrical conductivity. Densification is achieved under pressure prior to the attainment of thermal equilibrium within the mixture. Diamond/titanium diboride and boron carbide/titanium carbide composites are typical of the process.

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patent: 4659508 (1987-04-01), Higuchi
B. Marchon, J. Carrazza, H. Heinemann, and G. A. Somorjai, Carbon, v 26, n 4, pp. 507-514, 1988.
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M. Shimada, Ceramic Bulletin, v.65, n8, 1986, pp. 1153-1155.
M. Shimada et al., Ceramics International, v8, n3, 1982, pp. 93-98.
M. Shimada et al., J. Am. Ceram. Soc., v68, n2, 1985 pp. C-38-C-40.

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