Relation between oxygen concentration in AlN lattice and thermal conductivity of AlN ceramics sintered with various sintering additives
Relation between oxygen concentration in AlN lattice and thermal conductivity of AlN ceramics sintered with various sintering additives
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DOI：
10.2109/jcersj2.119.291
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发表时间：
2011-04-01
影响因子：
1.1
通讯作者：
Oh-Ishi, Katsuyoshi
中科院分区：
文献类型：
--
作者：
Kobayashi, Ryota;Moriya, Yoshiaki;Oh-Ishi, Katsuyoshi
采用无压烧结方法，分别添加5质量%Y_2O_3、2质量%Y_2O_3-3质量%Al_2O_3、3质量%Y_2O_3-1质量%CaO-0.08质量%B和6质量%Y_2O_3-2质量%CaO-0.16质量%B，对样品的相对密度、物相组成、晶格参数c和热导率进行了测定。利用AlN的氧浓度与晶格参数c之间的关系，由晶格参数c估算了AlN晶格中的氧浓度。为了分析样品的热导率对热导率的影响，我们绘制了由晶格参数c估算的AlN晶格中的氧浓度与热电阻率的关系图，这与本文测量的热导率相反。用5质量%Y_2O_3和3质量%Y_2O_3~(-1)质量%CaO-0.08质量比B烧结的样品的数据位于Slack或Harris等人提出的AlN晶格中氧浓度与AlN热电阻率的关系图上。(Harris‘s线)，相反，2质量%Y_2O_3-3质量%Al_2O_3和6质量%Y_2O_3-2质量%CaO-0.16质量%B烧结的样品则位于Harris’s线上方。结果表明，AlN晶格中的氧含量、密度和晶界相的存在都会影响样品的导热系数。(C)2011年日本陶瓷学会。版权所有。
Aluminum nitride (AlN) ceramics were fabricated by pressureless sintering with various sintering additives such as 5 mass % Y2O3, 2 mass % Y2O3-3 mass % Al2O3, 3 mass % Y2O3-1 mass % CaO-0.08 mass % B, and 6 mass % Y2O3-2 mass % CaO-0.16 mass % B. The relative density, phases present, lattice parameter c, and thermal conductivity of the samples were evaluated. The oxygen concentration in AlN lattice was estimated from the lattice parameter c by using the relation between the oxygen concentration and the lattice parameter c of AlN. To analyze the effects on the thermal conductivity of the samples, we plotted the oxygen concentration in AlN lattice estimated from the lattice parameters c versus the thermal resistivity, which is inverse of the thermal conductivity measured in this work. The data of the samples sintered with 5 mass % Y2O3 and 3 mass % Y2O3-1 mass % CaO-0.08 mass To B located on the plot of the relation between oxygen concentration in AlN lattice and thermal resistivity of AlN presented by Slack (Slack's line) or Harris et al. (Harris's line), respectively, in contrast, the data of the samples sintered with 2 mass % Y2O3-3 mass % Al2O3 and 6 mass % Y2O3-2 mass % CaO-0.16 mass % B, which contain excess grain boundary phases, located above the Harris's line. It was suggested that the thermal conductivity of the samples could be influenced by the density, the oxygen content in AlN lattice, and the presence of grain boundary phases. (C) 2011 The Ceramic Society of Japan. All rights reserved.