| (YCa)F3助烧AlN陶瓷的显微结构和热导率 |
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| 引用本文： | 刘耀诚,周和平,乔梁.(YCa)F3助烧AlN陶瓷的显微结构和热导率[J].无机材料学报,2000,15(4). |
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| 作者姓名： | 刘耀诚 周和平 乔梁 |
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| 作者单位： | 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室, 崐北京 100084 |
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| 摘 要： | 采用（ＣａＹ）Ｆ_３为助烧结剂，低温烧结（１６５０℃， ６ｈ）制备出热导率为２０８Ｗ／ｍ·Ｋ的ＡＩＮ陶瓷，在烧结过程中，热导率随保温时间的变化服从方程：λ（ｔ）＝λ∞－△λ（０）·ｅ~（－ｔ／ｒ）·用ＳＥＭ、 ＳＴｈＭ、 ＴＥＭ和 ＨＲＥＭ对 ＡＩＮ陶瓷的显微结构及其对热导率的影响进行了研究，结果表明，晶粒尺寸对ＡＩＮ陶瓷热导率的影响可以忽略，而分隔在ＡＩＮ晶粒之间的晶界相会降低热导率。
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| 关 键 词： | 氮化率 烧结 热导率 显微结构 扫描热显微镜 |
Microstructure and Thermal Conductivity of Aluminium Nitride with (YCa)F3 as Sintering Aid |
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| LIU Yao-Cheng,ZHOU He-Ping,QIAO Liang.Microstructure and Thermal Conductivity of Aluminium Nitride with (YCa)F3 as Sintering Aid[J].Journal of Inorganic Materials,2000,15(4). |
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| Authors: | LIU Yao-Cheng ZHOU He-Ping QIAO Liang |
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| Abstract: | Aluminium nitride ceramics were successfully fabricated through low-temperature sintering by using (YCa)F3 as the sintering aid. AlN ceramics with a high thermal conductivity of 208W/m were obtained after the specimen was sintered at 1650C for 6h. Calculation based on the present and reported results led to an equation which describes the dependence of thermal conductivity of AlN on the soaking time in sintering: (t)=-(0) et/. SEM, TEM, SThM and HREM were employed to study the microstructure-property relationship of AlN ceramics. It was concluded that AlN grain sizes have little effect on the thermal conductivity, while grain boundary phases deteriorate thermal conductivity |
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| Keywords: | aluminium nitride sintering thermal conductivity microstructure SThM |
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