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稀土氧化物和CaF2对AlN陶瓷烧结性能及热导率的影响
作者：贺智勇1 2 王峰1 2 张启富1 2 刘秋元1 2 3 千粉玲1 2 刘秀1 2 
单位：1. 中国钢研科技集团有限公司新冶集团 北京 100081 2. 特种陶瓷与耐火材料北京市重点实验室 北京 100081  3. 清华大学材料学院 北京 100084 
关键词：氧化钇–氧化铈–氟化钙 氮化铝陶瓷 气孔率 热导率 
分类号：TQ174
出版年,卷(期):页码：2018,46(6):0-0
DOI：10.14062/j.issn.0454-5648.2018.06.01
摘要：

 以4%Y2O3、3%Y2O3–1%CeO2、3%Y2O3–1%CaF2和3%Y2O3–0.5%CeO2–0.5%CaF2(质量分数)为助烧剂，于1 860 ℃制备得到了AlN陶瓷。研究了不同助烧剂体系对AlN陶瓷物相组成、显微结构、烧结性能及热导率的影响。结果表明：所得样品的物相组成中均含有AlN与钇铝酸盐相，在含有CeO2助烧剂的样品中还检测到少量的铈铝氧化物相；样品晶粒尺寸分布均在3~8 μm之间。与添加一元及二元助烧剂相比，三元助烧剂的引入能更有效促进AlN陶瓷烧结致密化，强化其导热性能。添加三元助烧剂制备得到AlN陶瓷的体积密度为3.29 g/cm3，气孔率为0.58%，热导率为184.8 W/(m•K)。

 The AlN ceramic was prepared at 1 860 ℃ with the sintering aids of 4%Y2O3, 3%Y2O3–1%CeO2,3%Y2O3–1%CaF2 and 3%Y2O3–0.5%CeO2–0.5%CaF2 (mass fraction) respectively. The effects of different sintering aids on the phase composition，microstructure, sintering property and thermal conductivity of AlN ceramics were investigated. The results showed that AlN and yttrium aluminate oxide phases were detected in all the samples. Some weak diffraction peaks corresponding to cerium aluminum oxide were also found in the samples with the sintering aids containing CeO2. The grain size of all the samples was in the range of 3–8 μm. Compared with the addition of single and binary sintering aids, the introduction of ternary sintering aids into the sample could promote the sintering densification of AlN ceramic and enhance its thermal conductivity. The AlN ceramic with the bulk density of 3.29 g/cm3, porosity of 0.54%, thermal conductivity of 184.8 W/(m•K) was obtained by the addition of ternary sintering aids.
基金项目：
国家科技重大专项 (2013ZX02104)资助。
作者简介：
参考文献：

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