摘要
研究了多种强韧化方法以提高超高温陶瓷材料抗热冲击性能,包括碳化硅晶须增强增韧、石墨软相增韧和氧化锆相变增韧。同时,还研究了碳化硅含量对超高温陶瓷材料的抗氧化性能影响。研究结果表明:碳化硅晶须和氧化锆的添加显著提高了材料的抗热冲击临界温差,而石墨软相的引入对抗冲击临界温差的影响不大,但显著提高了裂纹扩展阻力和强度保持率。高SiC含量超高温陶瓷材料在1 800℃以下具有的优异的抗氧化性能,在更高的温度下,高与低的SiC含量对超高温陶瓷材料的抗氧化性能均不利,通过优化材料的组分以降低材料表面温度是提高超高温陶瓷材料的抗氧化性能的一个非常有效的途径。
In order to improve the thermal shock resistance of the ultra-high temperature ceramics （UHTCs） , a variety of strengthening and toughening methods, including SiC whisker strengthening and toughening, soft phase graphite toughening and zireonia phase transformation toughening, have been investigated. Meanwhile, the effect of SiC content on the oxidation resistance of UHTCs was also studied. The results show that the additions of SiC whisker and zirconia significantly improve the critical thermal shock temperature of UHTCs, while the introduction of graphite has minor effect on the critical thermal shock temperature, yet has greatly improved the crack resistance and retained the strength rates of UHTCs. UHTCs with high SiC content has excellent oxidation resistance below 1800 ℃. However, either high or low SiC content above 1800 ℃ is unfavorable to the oxidation resistance of the materials. An effective way to improve the oxidation resistance of UHTCs is to reduce the surface temperature by component optimization.
出处
《中国材料进展》
CAS
CSCD
2011年第1期27-31,25,26,共7页
Materials China
基金
国家自然科学基金资助项目(51072042)
黑龙江省杰出青年基金
特种环境复合材料技术国防科技重点实验室开放基金(HIT.KLOF.2009026)资助项目
关键词
超高温陶瓷材料
强韧化
抗热冲击
抗氧化
ultra-high temperature ceramics （UHTCs）
strengthening and toughening
thermal shock resistance
oxi- dation resistance
