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ultra fine alumina
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To dissolve aluminum hydrate by use of industrial sulfate acid,and to neutralize by aqueous ammonia,and then to be treated by complexing depuration,washing and diffusion processes.In laboratory,high-purity and ultra-fine alumina with a purity of 99 99% and grain size d 50 (in diameter)of 0 5μm was made.

采用工业硫酸溶解工业氢氧化铝,再用氨水中和,经过络合除杂、洗涤、分散等工艺过程,试验研究获得了纯度达9999%、粒径d50为05μm的高纯超细氧化铝产品

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...

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

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.

 
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