摘要
将两种颗粒增韧相与HfB2陶瓷基体按配比混料、热压制备了双相颗粒混杂增韧HfB2陶瓷复合材料,重点研究其高温压缩性能、热膨胀性能、耐烧蚀性能以及显微组织。结果表明,HfB2复合材料的室温压缩性能较高,但高温下压缩性能显著下降。随着温度升高,HfB2复合材料的体积膨胀率单调增加;平均线膨胀系数变化平缓;而瞬时线膨胀系数先减小后增大,有一个最小值,最小瞬时线膨胀系数在900℃,其值为5.65×10-6/K。该复合材料在等离子电弧加热器上烧蚀8s后,部分韧化相熔化飞出,留下孔洞。
The two phase particle softening HfB2 composites were prepared by means of mixing and hot-pressing. Their compressive properties, hot expansion coefficient, ablation resistance and the microstructure were studied. The results showed that the compressive properties of the HfB2 composites at room temperature were finer, while those at high temperature decreased sharply. With the temperature increased, the volume expansion ratio increased gradually; the average linear expansion factor hardly changed; while the instant linear expansion factor decreased first, and then raised, there was a minimum value. It was 5. 65×10^-6/K at 900℃. After the HfB2 composites had been ablated on the plasma-arc heater for 8s, the partial softening particles of the composites were melted and spurted, remaining holes.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2006年第1期24-26,65,共4页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(90205034)
关键词
HfB2陶瓷
颗粒增韧
性能
显微组织
HfB2 ceramics
particle softening
property
microstructure
作者简介
李金平（1969-），男，博士后，副教授，主要从事超高温陶瓷材料以及特种粉末冶金工艺的研究，联系地址：哈尔滨南岗区一匡街2号哈工大科学园A座3010信箱（150080）。
