放電焼結のプロセス解析・制御とマイクロ・マクロモデリング

抄録

The densification or sintering processes in spark sintering has systematically investigated from the standpoint of punch-powder compact-die system, unlike the conventional situation such as the simple convenient method for fabricating sintered body. The systematic investigation consists of the following serial subjects; (1) clarification of principle of process, (2) modeling of coupling between micro- and macro-phenomena, (3) generalization of process control, (4) fabrication of high performance and multi-functional materials by optimization of process factors. Especially, the micro-phenomena in and/or between powder particles were coupled with the macro-phenomena such as heat transfer in the punch-compact-die system through micro/macro-coupling model. The coupling analysis for electricity (voltage and current) and heat was carried out by using Ohm's and Fourier's laws on the basis of the thermal energy conservation law. The optimized system for spark sintering process was proposed by the computer simulation based on micro/macro-coupling modeling and enabled to attain full densification even for poor sinterable materials, which led to the successful development of many metallic and ceramic materials in the industrial fields.