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KINETIC DEMIXING IN ALPHA-ALUMINA DURING COOLING - INFLUENCE ON THE POWDER REACTIVITY

机译:冷却过程中铝对铝的动力学脱氧-对粉末反应性的影响

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摘要

We study the influence of the thermal treatment conditions on the solute cation redistributions at the near surface of alumina samples. Experiments have been done both on Mg-doped alpha-alumina powders and on Mg- and Ti-doped alpha-alumina single crystals. The results have been analyzed taking into account the influence of two competing effects: the cation redistribution kinetics and the driving force of matter transport related to the cooling rate and due to the electrochemical potential gradient which appears in the material during cooling. The influence of the alumina powder characteristics on the sintering kinetics has been followed using dilatometry. As expected, densification is favoured when the surface area increases. However, a lower shrinkage is observed for powders highly contaminated with silicon. [References: 9]
机译:我们研究了热处理条件对氧化铝样品近表面溶质阳离子再分布的影响。已经对掺镁的α-氧化铝粉末以及掺镁和钛的α-氧化铝单晶进行了实验。分析结果时考虑了两个竞争效应的影响:阳离子再分配动力学和物质传输的驱动力与冷却速率有关,并且归因于冷却过程中材料中出现的电化学势梯度。氧化铝的粉末特性对烧结动力学的影响已经通过膨胀法进行了跟踪。如所预期的,当表面积增加时,致密化是有利的。但是,对于高度被硅污染的粉末,收缩率较低。 [参考:9]

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