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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(ii)
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:
？固定cuo(0.4%)和tio2(4%)的添加量、改变tio2(0--32%)和cuo(0--3.2%)的添加量(质量分数,下同),研究了cuo--tio2复合助剂对氧化铝陶瓷烧结性能、微观结构、物相组成以及烧结激活能的影响,以揭示复合助剂的低温烧结机理。结果表明,在1150--1200℃tio2固溶入al2o3生成al2ti7o15相,并生成大量正离子空位提高了扩散系数,从而以固相反应烧结的作用机理促进了氧化铝陶瓷的致密化;tio2在al2o3中的极限固溶度为2%--4%,超过固溶极限的tio2对陶瓷烧结没有促进作用;添加适量的cuo(0.4%)可将tio2在al2o3中的固溶温度降低到1100℃以下,并以液相润湿作用促进氧化铝陶瓷的致密烧结。陶瓷烧结激活能的计算结果定量地印证了上述烧结机理;当在al2o3中添加4%的tio2和2.4%的cuo,可将烧结激活能降低到54.15kj？?mol-1。
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