Also called an indirect flame furnace. A furnace with a partition (muffle) made of refractory material with good thermal conductivity between the heat source or heating element and the firing chamber. Without a muffle, thermal efficiency is better and the operating temperature can be higher, but problems such as the material being sintered becoming dirty, the atmosphere inside the furnace changing, and the heating element being damaged can occur. As a countermeasure, the material to be sintered is generally placed in a sagger before firing, but when this is not sufficient, a muffle furnace is used. This furnace is essential for firing ceramics, such as electronic ceramics and new ceramics, whose functions must be precisely controlled. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
間接炎式炉ともいう。熱源あるいは発熱体と焼成室との間に,熱伝導性のよい耐火物による隔壁(マッフル)をつけた炉。マッフルがないほうが熱効率はよく,使用温度も高くとることができるが,被焼成物が汚れる,炉内の雰囲気が変化する,発熱体が侵されるなどの問題が生ずる場合がある。その対策として被焼成物を匣鉢(さや)に入れて焼成することが一般に行われるが,それでも不十分な場合にはマッフル炉を使用する。エレクトロニクスセラミックスとかニューセラミックスとか呼ばれる,精密に機能を制御しなければならないセラミックスの焼成には不可欠な炉である。
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