预热粉体爆炸烧结超细氧化铝陶瓷初步研究

Preliminary Study on Ultra-fine Alumina Ceramic by Technique of Powder Preheating and Explosive Cansolidation

预热粉体爆炸烧结具有烧结时间短（0．1微秒内），产生作用力大（几十个GPa）、能瞬时将超细粉体和纳米粉体烧结成致密陶瓷的优点．本研究将单相超细氧化铝粉（0．4μm）首先预热到800℃，然后进行爆炸烧结，获得了密度超过98％TD的超细氧化铝陶瓷，并用SEM和XRD分析了氧化铝陶瓷的显微结构．

The technic of powder preheating and explosive c0nsolidation has these predominances, i.e. It has very short sintering time (0.1μS) and can release great force (tens of GPa),the ultra-fine powder or nano-powder can be sintered into high-density ceramic immediately. In this research, the single-phase ultra-fine powder(0.4μm) was preheated to 800℃ at first, then the method of explosive consolidation was adopted and the ultra-fine alumina ceramic whose density was over 98% TD was gotten. The microstructure of alumina ceramic was analysed by SEM and XRD