摘要
将氧化锆添加到氧化铝基陶瓷中,系统研究了其加入量(外加质量分数分别为0.75%、1.5%、2.25%和3%)对试样烧结性能、高温膨胀性能及导热性能的影响。通过高温立式热膨胀仪、激光导热仪等分析测试技术对试样进行了性能表征,结果表明:随着氧化锆加入量的增大,试样的显气孔率增大,体积密度减小;试样的导热系数随氧化锆的加入呈指数衰减,导热性能降低;其热膨胀系数呈正弦曲线变化,wt(ZrO2)%为1.5%～2.0%的试样热膨胀系数最小。氧化锆的引入,可改善氧化铝基陶瓷材料的抗热震性能。
By adding zirconia to alumina ceramic matrix composites at different levels of 0. 75wt. %, 1.5wt. %, 2.25wt. % and 3wt. %, the influences on sintering performance, thermal expansion property and thermal conductivity were systematically investigated. Using the SEM, High-temperature dilatometer and Laserflash thermal analyzer, etc, the property characterization of the samples was conducted. According to the results, the ascending additions of zirconia increase the apparent porosity and decrease the bulk density; the thermal conductivity is exponentially descending ; thermal expansion coefficient follows a sinusoidal trend, of which the sample of zirconia between1.5wt. % and 2. Owt. % is the least. It is manifested that application of zirconia can improve the thermal shock resistance of alumina ceramic matrix composites.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2013年第2期264-267,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金"基质显微结构参数与耐火浇注料物理性能的相关性研究"资助项目(50774057)
关键词
氧化锆
氧化铝
导热系数
热膨胀系数
抗热震性
zirconia
alumina
thermal conductivity
thermal expansion coefficient
thermal shock resistance
