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

Bulletin of materials science

T R N Kutty¹  A M Umarji¹  K Geetha¹ 

[1] Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Materials Research Centre, Indian Institute of Science, Bangalore 560 012, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$

关键词: G â†�?? C conversion;    reaction bonding;    alumina ceramics;    calcium aluminate;    high temperature cements.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Compositions in CaOâ€�?�Al₂O₃ system have been prepared by gelâ€�?�toâ€�?�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 800â€�??1200°C. Fine grained powders were used as refractory cement for joining alumina ceramics. An optimum temperature of 1450°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 CaOâ€�?�Al₂O₃ phase diagram.

【 授权许可】

Unknown