Ceramic joining through reactive wetting of alumina with calcium aluminate refractory cements

被引：24

作者：

Geetha, K ^{[1
]}

Umarji, AM ^{[1
]}

Kutty, TRN ^{[1
]}

机构：

[1] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India

来源：

BULLETIN OF MATERIALS SCIENCE | 2000年 / 23卷 / 04期

关键词：

G -> C conversion; reaction bonding; alumina ceramics; calcium aluminate; high temperature cements;

D O I：

10.1007/BF02720077

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Compositions in CaO-Al2O3 system have been prepared by gel-to-crystallite conversion method. Reactive powders of 1 : 2, 1 : 1, 2: 1 and 3 : 1 of CaO and Al2O3 compositions were obtained by calcining the product at 800-1200 degrees C. Fine grained powders were used as refractory cement for joining alumina ceramics. An optimum temperature of 1450 degrees C for 4 h produced joints of satisfactory strength. The microstructure and X-ray phase analysis of the fractured joint surface clearly indicate reactive wetting of the alumina ceramics. This wetting enhances the joining of alumina substrates and can be attributed to the formation of Ca12Al14O33 liquid phase. The results are explained by using CaO-Al2O3 phase diagram.

引用

页码：243 / 248

页数：6

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