日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 10 (2003),
pp. 528-537

Densification Rate of Cu-Al2O3 Composite in the Spark Sintering Process

Hideaki Kuramoto1, Kazuhiro Matsugi2, Kohsei Kawahara2, and Osamu Yanagisawa2

1Hiroshima City Industrial Promotion Center, Hiroshima 730-0052
2Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527

Abstract:

The densification rate of Cu-Al2O3 composite was measured and analyzed to investigate the influences of the alumina particles addition on the densification process in the spark sintering process.

The consolidation of Cu-10~} 50 vol%Al2O3 composites proceeds due to the plastic flow of copper powder compact matrix. The effect of the alumina particles on the spark sintering of composites was analyzed based on the following equation, including the increase of relative density of composite compact, D-D0, that of copper (Dc-c-D0) and alumina (Dal-al-D0) and the particle contact probability of ``copper-copper'' ((1-Vp)2), ``copper-alumina''(2Vp(1-Vp)) and ``alumina-alumina'' (Vp2).
\[
(D-D0)={(1-Vp)2+2η Vp(1-Vp)(Dc-c-D0)+Vp2(Dal-al-D0)
\]
where η is a ratio of the relative density increase at ``copper-alumina'' particle contacts to that at ``copper-copper'' particles contacts, and η ≤q 1. Moreover, D, Dc-c and Dal-al are the relative density of composite compact, copper and alumina at a given temperature and pressure, respectively, and Vp is the volume fraction of added alumina particles.


(Received February 17, 2003)

Keywords:

spark sintering, Cu-Al2O3 composite, plastic deformation, power law creep deformation, threshold stress


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