Effects of carbothermal reduction on the thermal and electrical conductivities of aluminum nitride ceramics
Effects of carbothermal reduction on the thermal and electrical conductivities of aluminum nitride ceramics
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DOI：
10.1016/j.ceramint.2010.04.001
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发表时间：
2010-09-01
影响因子：
5.2
通讯作者：
Lee, Sung-min
中科院分区：
文献类型：
--
作者：
Kim, Hui-sik;Chae, Jung-min;Lee, Sung-min
本研究试图通过添加不同数量的钇烧结添加剂或通过在功率处理步骤中使用加碳来引入原位碳热还原来控制氧含量。虽然钇和碳的加入都提高了导热系数和电阻率，但对于含有3或5 wt% Y2O3的试样，碳的加入对提高直流体积电阻率更有效。在晶粒的电导率和晶界的几个因素中，晶粒的电导率似乎与AlN陶瓷的热导率更相关。此外，在晶界区观察到钇的富集。我们还发现原位碳热还原会产生少量的钇铝酸盐第二相，这有利于AlN陶瓷的抗等离子体性能。(C) 2010 Elsevier Ltd and Techna Group S.r.l保留所有权利。
This study attempts to control the oxygen content by adding various amounts of yttria sintering additives or by introducing an in situ carbothermal reduction using a carbon addition during the Power processing step. While both yttria and the carbon addition increased the thermal conductivity and electrical resistivity, carbon addition was more effective in increasing the DC volume resistivity for specimens that had 3 or 5 wt% Y2O3. Among several elements of the electrical conductivities of the grains and grain boundaries, the conductivity of the grains appeared to be more relevant to the thermal conductivities of AlN ceramics. In addition, yttrium enrichment was observed in the grain boundary region. We also found that an in situ carbothermal reduction resulted in a small amount of yttrium-aluminate second phases, which are beneficial to the plasma resistance of the AlN ceramics. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.