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OALib Journal期刊
ISSN: 2333-9721
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cuo--tio2复合助剂低温烧结氧化铝陶瓷的机理(i)
Keywords: 无机非金属材料,氧化铝,烧结助剂,液相烧结,固相反应烧结
Abstract:
？向氧化铝陶瓷中添加总量固定、但m(cuo)/m(tio2)不同的cuo--tio2复合助剂,研究其对氧化铝陶瓷烧结性能、微观结构以及物相组成的影响,揭示复合助剂的低温烧结机理.结果表明,cuo与tio2不易发生化合反应,分别以液相烧结和固相反应烧结来促进氧化铝陶瓷的致密化进程;tio2与al2o3反应生成a12ti7o15的固相烧结,比cuo的液相烧结更能有效地促进陶瓷的晶粒生长与致密化.在tio2固相烧结的基础上适当引入cuo液相,能够最大程度地降低氧化铝陶瓷的烧结温度;当在50gal2o3粉体中添加总量为0.025mol的cuo--tio2复合助剂,并使m(tio2)/m(cuo+tio2)为0.80时,氧化铝陶瓷在1250℃烧结后其密度达到理论密度的98%以上.
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