Influence of processing atmosphere on the microstructural evolution of submicron alumina powder during sintering
Influence of processing atmosphere on the microstructural evolution of submicron alumina powder during sintering
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DOI：
10.1016/j.ceramint.2009.03.037
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发表时间：
2009-09-01
影响因子：
5.2
通讯作者：
Tomasi, R.
中科院分区：
文献类型：
--
作者：
Chinelatto, A. S. A.;Tomasi, R.
对亚微米氧化物粉末烧结的研究揭示了有趣的行为，特别是在加热过程中早期低温转变中的微观结构演变方面。在这项工作中，对亚微米氧化铝粉末进行了实验，在空气、干燥空气和高真空（10(-8) atm）中从900°C到1400°C烧结后表征了其微观结构演变和致密化。结果表明，加工气氛强烈影响收缩发生前低温下的粒度分布。收缩随着晶粒生长而开始，并且烧结气氛影响烧结动力学。该因素与先前的粒度分布变窄有关，可能会影响烧结最后阶段的晶粒生长和致密化。 (C) 2009 Elsevier Ltd 和 Techna Group S.r.l.版权所有。
Investigations into the sintering of submicron oxide powders have revealed interesting behavior, particularly insofar as it concerns their microstructural evolution in the early, low temperature transformations during heating. In this work, experiments were conducted on a submicron alumina powder, whose microstructural evolution and densification were characterized after sintering from 900 degrees C to 1400 degrees C in air, dry air and high vacuum (10(-8) atm). The results indicated that the processing atmosphere strongly influences the particle size distribution at low temperatures before shrinkage occurs. Shrinkage began concomitantly with grain growth and the sintering atmosphere influenced the sintering kinetics. This factor, which is associated with previous narrowing of the particle size distribution, may affect grain growth and densification during the final stage of sintering. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.