刘磊仁;聂光临;黄丹武;赵振华;包亦望;伍尚华;

• 1:广东工业大学机电工程学院
• 2:中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室

摘要(Abstract)：

Al_2O_3作为应用最广的陶瓷基板，优异的力学强度、韧性与导热性能是确保其安全可靠服役的前提。稀土金属氧化物(La_2O_3、Y_2O_3)掺杂是提升Al_2O_3陶瓷力学性能的有效方法，然而，单一掺杂的强化效果有限，因此，采用La_2O_3-Y_2O_3复掺的方法以望进一步提升Al_2O_3陶瓷基板的抗弯强度与断裂韧性，并在此基础上探讨了La_2O_3-Y_2O_3复掺对Al_2O_3陶瓷热导率的影响规律。采用流延工艺分别于1550℃、1600℃保温2 h制得了Al_2O_3陶瓷，研究了烧结温度和La_2O_3/Y_2O_3掺量之比对Al_2O_3陶瓷物相组成、显微结构、力学-热学性能的影响，研究结果表明：当烧结温度为1550℃时，随着La_2O_3/Y_2O_3掺量之比的降低，Al_2O_3陶瓷的热导率逐渐增大，而其抗弯强度和断裂韧性呈先上升后下降的变化趋势，4 wt.%La_2O_3-1wt.%Y_2O_3复掺制得的Al_2O_3陶瓷最高抗弯强度为(682.24±41.51)MPa、最高断裂韧性为(5.58±0.56) MPa·m^(1/2)，且其热导率较5 wt.%La_2O_3单掺试样高20.3%；当烧结温度为1600℃时，随着La_2O_3/Y_2O_3掺量之比的降低，Al_2O_3陶瓷的热导率逐渐增大，而其抗弯强度和断裂韧性逐渐减小，即掺加5 wt.%La_2O_3的Al_2O_3陶瓷(5:0-1550℃)最高抗弯强度为(629.57±31.15)MPa、断裂韧性为(5.71±0.34) MPa·m(1/2)，且其热导率较5 wt.%La_2O_3单掺试样高20.3%；当烧结温度为1600℃时，随着La_2O_3/Y_2O_3掺量之比的降低，Al_2O_3陶瓷的热导率逐渐增大，而其抗弯强度和断裂韧性逐渐减小，即掺加5 wt.%La_2O_3的Al_2O_3陶瓷(5:0-1550℃)最高抗弯强度为(629.57±31.15)MPa、断裂韧性为(5.71±0.34) MPa·m^(1/2)。由上述两个烧结温度获得的最优强度-韧性试样的性能对比可知，La_2O_3-Y_2O_3复掺的强化效果与烧结温度密切相关，4:1-1550℃试样的热导率与弯曲强度分别较5:0-1600℃试样高5.6%、8.4%，说明La_2O_3-Y_2O_3复掺有利于低温烧结制备力学-热学综合性能优异的Al_2O_3陶瓷。

关键词(KeyWords)： Al_2O_3陶瓷;抗弯强度;热导率;断裂韧性;流延成型

Abstract:

Keywords:

基金项目(Foundation): 广东省“珠江人才计划”本土创新科研团队项目(2017BT01C169);; 广东省基础与应用基础研究基金项目(2020A1515010004);; 绿色建筑材料国家重点实验室开放基金(2019GBM03)

作者(Authors): 刘磊仁;聂光临;黄丹武;赵振华;包亦望;伍尚华;

DOI: 10.13957/j.cnki.tcxb.2021.06.016

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