Affiliation:
1. Harbin Institute of Technology
Abstract
HfB2-HfC-SiC ultrahigh temperature ceramics (UHTCs) were prepared and characterized in
this paper. It is showed that the densities of the HfB2-HfC-SiC reach 98.5% of the theory density. The
room temperature compressive properties of the HfB2-HfC-SiC are good, while those at high temperature
decrease rapidly. The volume expansion ratio monotonously increases (up to 2.35% at 2300°C) with
increasing temperature. Furthermore, with increasing temperature, the average linear expansion
coefficient hardly changes, while the instant linear expansion coefficient decreases first, and followed by
an increase. The minimum value of the instant linear expansion coefficient is 5.65×10-6/K at 900°C and
that of the mean linear expansion coefficient is 7.39×10-6/K at 1340°C. HfB2-HfC-SiC were burned with
the plasma arc heater. After 8-second ablation, part of the SiC particles melted and spurted from the
composites, and holes appeared.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献