Microstructure and thermal conductivity of spark plasma sintering AlN ceramics
Microstructure and thermal conductivity of spark plasma sintering AlN ceramics
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DOI：
10.1179/026708309x12506933873666
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发表时间：
2011-02
影响因子：
1.8
通讯作者：
X. He;F. Ye;L. Liu;H. J. Zhang
中科院分区：
文献类型：
--
作者：
X. He;F. Ye;L. Liu;H. J. Zhang
采用火花等离子烧结技术，分别以Y2O3、Sm2O3和Dy2O3为烧结添加剂，在1700℃的较低烧结温度下制备了致密的氮化铝陶瓷。研究了三种烧结添加剂对AlN陶瓷相组成、显微结构和导热性能的影响。结果表明，这些烧结添加剂不仅通过液相烧结机制促进了致密化，而且通过减少氧杂质提高了导热性。与Y2O3和Dy2O3相比，Sm2O3能有效提高AlN陶瓷的导热性。扫描电镜观察表明，火花等离子烧结法制备的AlN陶瓷的显微组织较为均匀，但AlN的晶粒尺寸、形状和二次相的位置随烧结添加剂的不同而不同。添加剂主要通过影响AlN晶粒的生长和二次相的位置来影响AlN陶瓷的导热性。
Dense aluminium nitride ceramics were prepared by spark plasma sintering at a lower sintering temperature of 1700°C with Y2O3, Sm2O3 and Dy2O3 as sintering additives respectively. The effects of three kinds of sintering additives on the phase composition, microstructure and thermal conductivity of AlN ceramics were investigated. The results showed that those sintering additives not only facilitated the densification via the liquid phase sintering mechanism, but also improved thermal conductivity by decreasing oxygen impurity. Sm2O3 could effectively improve thermal conductivity of AlN ceramics compared with Y2O3 and Dy2O3. Observation by scanning electron microscopy showed that AlN ceramics prepared by spark plasma sintering method manifested quite homogeneous microstructures, but AlN grain sizes and shapes and location of secondary phases varied with the sintering additives. The thermal conductivity of AlN ceramics was mainly affected by the additives through their effects on the growth of AlN grain and the location of secondary phases.