材料科学
钇
热导率
烧结
微观结构
陶瓷
氮化物
相(物质)
还原气氛
氧气
晶界
氧化物
电导率
杂质
矿物学
复合材料
冶金
物理化学
化学
图层(电子)
有机化学
作者
Hai Jiang,Xiaoyun Huo,Xiaohong Wang,Xue‐Kai Lan,Wenzhong Lü
标识
DOI:10.1016/j.ceramint.2023.07.267
摘要
The effect of yttrium fluoride (YF3) on the densification behavior, microstructure, phase composition and thermal conductivity of aluminium nitride (AlN) ceramics with yttrium oxide (Y2O3) and YF3 additives were studied. Since YF3 provided liquid phases and promoted densification at a lower temperature, the sintering temperature required to reach the full density of AlN samples decreased with the increase in YF3 content. Appropriate addition of YF3 could improve the thermal conductivity of AlN ceramics, but the values of thermal conductivity decreased as YF3 increased further. It is attributed to the ability of YF3 to react with oxygen impurity was worse than that of Y2O3. Moreover, the reducing atmosphere significantly affected the phase composition, and the oxygen content in grain boundary phases decreased at 1750 °C and 1800 °C. Therefore, the proper proportion of Y2O3–YF3 additives could simultaneously improve densification and the thermal conductivity of AlN samples at a low sintering temperature.
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