通電焼結機における黒鉛型内温度の均一化

抄録

Many electric current sintering machines are currently used, since short-time heating and sintering of highly dense compacts can be realized by making use of Joule heat. However non-uniform temperature distribution inside the mold in the conventional electric current sintering machines was a disadvantage and hence was not necessarily suitable for the commercial production of high grade sintered materials for electronic devices. Multi-axis electric current sintering equipment, which has a vertical pressing axis and two independent horizontal current axes, has been developed to solve the above problem.
The present study was carried out using this equipment. Temperatures inside the graphite mold of 140 mm inner diameter were measured for single axis electrification and two axis electrification by alternately changing the current axis. It was found that the temperature at the center was lower than that at the point of 62 mm from the center and that in the latter case the temperature difference was successfully controlled to 10 K, whereas in the former case the temperature difference was as large as 100 K.