Liquid Phase Formation and Sintering Mechanism of Nitride-Oxide Ceramics.

氮化物-氧化物陶瓷的液相形成和烧结机理。

• 批准号: 05650629
• 负责人: SHINOZAKI Kazuo
• 金额: $ 1.6万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650629/
• 关键词: Aluminum Nitride; AlN; Grain Boundary Phases; Y_2O_3-Al_2O_3; Liquid Phase Formation; Liquid Phase Sintering; High Temperature DTA

The liquid phase formation in the system AlN-Y_2O_3-Al_2O_3 and the sintering mechanism in Y_2O_3 doped AlN system were investigated using self-made high-temperature DTA and quenching method. We prove the AlN itself reacts with grain boundary phases to form liquid phase at high temperature using the high-temperature DTA.High-temperature DTA applicable upto 2000ﾟC for non-oxygen atmosphere was made using the DTA unit that composed BN cell and Re20%W/Re40%W thermocouple. The DTA cell was constructed for reducing the leak current and carbon vapor. The D.C.power source was used for reducing the noise.Y_4Al_2O_9-AlN,Y_3Al_5O_<12>-AlN,and the eutectic composition between Y_3Al_5O_<12> and Al_2O_3 and AlN systems were used for detecting the liquid phase formation temperature by means of the DTA.Phase chemistry for the samples after DTA measurement revealed no compounds between AlN and Y_2O_3-Al_2O_3 system. The liquid phase formation temperature decreased significantly (80 to 230ﾟC) by the addition of AlN to Y_2O_3-Al_2O_3 composition. The lowest temperature of the liquid phase formation in this experiment was 1690ﾟC.Lattice parameter of Y_4A_<12>O_9 changed slightly in the sample Y_4Al_2O_9-AlN system quenched at above liquid phase formation temperature. EPMA shows, however, no direct observation of nitrogen dissolution to Y_4Al_2O_9. This means the phase diagram of the system Y_2O_3-Al_2O_3-AlN is eutectic type. Partial phase diagram of the system Y_3Al_5O_<12>-AlN was proposed using DTA and quenchying results.The liquid phase sintering of the Y_2O_3 added AlN system proceeds through the large amount of liqauid phase made of Y_2O_3 additive, impurity oxygen and AlN itself. During cooling liquid phase decomposes into Y-Al-O and AlN,oxygen remains in the Y-Al-O phases and decomposed AlN is purified. This produces the high thermal conductive AlN.

用自制的高温差热分析仪和淬火法研究了AlN-Y_2 O_3-Al_2O_3体系中液相的形成和Y_2O_3掺杂AlN体系的烧结机理。用高温差热分析证明了AlN本身在高温下与晶界相反应形成液相，用BN电池和Re20%W/Re40%W热电偶组成的差热分析装置进行了适用于2000 ℃无氧气氛的高温差热分析。差热分析池的构造是为了减少漏电流和碳蒸气。采用直流电源降低噪声，用差热分析（DTA）方法测定了Y_4Al_2O_9-AlN、<12>Y_3Al_5O_3-AlN以及Y_3Al_5O_3-Al_2O_3和AlN体系的共晶组成<12>，发现AlN和Y_2O_3-Al_2O_3体系之间没有化合物。在Y_2O_3-Al_2O_3体系中加入AlN后，液相形成温度显著降低（80 ~ 230 ℃）。本实验中液相形成的最低温度为1690 ℃，在<12>高于液相形成温度淬火的样品Y_4Al_2O_9-AlN体系中，Y_4A_O_9的晶格常数变化不大。电子探针（EPMA）没有直接观察到氮在Y_4Al_2O_9中的溶解。这表明Y_2O_3-Al_2O_3-AlN系统的相图为共晶型。利用<12>差热分析和淬火实验结果，提出了Y_3Al_5O_3-AlN体系的部分相图，Y_2O_3添加AlN体系的液相烧结是通过Y_2O_3添加剂、杂质氧和AlN本身形成的大量液相进行的。在冷却过程中，液相分解为Y-Al-O和AlN，氧保留在Y-Al-O相中，分解的AlN被纯化。这产生了高导热性的AlN。

项目成果

K.Shinozaki: "Liquid Phase Formation in the System Y_2O_3-Al_2O_3-AlN System." J.Am.Ceram.Soc.,in preparation.

K.Sinozaki：“Y_2O_3-Al_2O_3-AlN 系统中的液相形成。”

K.Shinozaki, S.Arunaga, H.Yamashita, Y.Sawada and N.Mizutani: "Liquid Phase Formation in the System Y_2O_3-Al_2O_3-AlN System." J.Am.Ceram.Soc.(in preparation.).

K.Shinozaki、S.Arunaga、H.Yamashita、Y.Sawada 和 N.Mizutani：“Y_2O_3-Al_2O_3-AlN 系统中的液相形成。”

K.Shinozaki: "Liquid phase formation and sintering of AlN." The Abstracts of the 95th Annual Meeting of the American Ceramic Society,SXV-40-93. 210 (1993)

K.Sinozaki：“AlN 的液相形成和烧结。”

K.Shinozaki, H.Yamashita, N.Mizutani and Y.Sawada: "Liquid phase formation and sintering of AlN." The Abstracts of the 95th Annual Meeting of the American Ceramic Society. SXV-40-93. 210 (1993)

K.Shinozaki、H.Yamashita、N.Mizutani 和 Y.Sawada：“AlN 的液相形成和烧结。”

H.Yamashita, K.Shinozaki and N.Mizutani: "The temperature measurement of the liquid phase fromation in AlN-Y_2O_3(CaO)-Al_2O_3 system using a self-made high temperarure DTA(in Japanese)." Teh Abstract of 1993 Annual Meeting of Ceram.Soc.Japan. 3C05. 601 (

H.Yamashita、K.Shinozaki 和 N.Mizutani：“使用自制的高温 DTA 测量 AlN-Y_2O_3(CaO)-Al_2O_3 体系中液相形成的温度（日文）”。