Sintering and Grain Growth of Alumina
Sintering and Grain Growth of Alumina
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DOI：
10.1111/j.1151-2916.1954.tb13993.x
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发表时间：
1954-12
影响因子：
3.9
通讯作者：
W. Smothers;H. J. Reynolds
中科院分区：
文献类型：
--
作者：
W. Smothers;H. J. Reynolds
研究了添加杂质（氧化物）类型对氧化铝烧结和晶粒生长的影响。将重量为1%的杂质添加到商用Be-grained alumina中，或与ilcl3共沉淀形成氢氧化物。烧制收缩率、体积密度和表观孔隙率测量被用来将烧结与岩石学和电子显微镜观察到的晶粒生长联系起来。一些促进晶粒生长的添加剂与氧化铝进入固溶体，使晶格充分应变，从而大大增加了材料的输运。其他添加剂被认为产生玻璃相，这将大大增加表面扩散和导致晶粒长大。由于杂质在加热时产生的相对较大的气相可能被吸附在氧化铝上，一些添加剂降低了晶粒的生长；其他添加剂可能会造成阴离子空缺，以减少物质的运输，或者可能会产生复杂的阴离子，其流动或扩散可能受到阻碍。
The sintering and grain growth of alumina as a function of the type of impurity (oxide) added was studied. One weight per cent of the impurity was added to a commercial Be-grained alumina or was coprecipitated with iilcl3 to form hydroxides. Fired shrinkage, bulk density, and apparent porosity measurements were used to correlate sintering with grain growth as observed by the petrographic and electron microscope. Some additives which increased grain growth were believed to enter into solid solution with alumina and to strain the lattice sufficiently to increase material transport greatly. Other additives were believed to produce a glassy phase which would greatly increase surface difusion and resulting grain growth. Some additives decreased grain growth because of the relatively large vapor phase produced by the impurity upon heating which may have been sorbed on the alumina; other additives may have Wed anion vacancies to reduce material transport or may have produced complex anions whose flow or diffusion may have been impeded.