摘要
利用X射线衍射仪、扫描电子显微镜、压汞仪和热重分析仪等方法,在1100～1500℃范围内研究了Sialon结合SiC复相材料的高温抗氧化行为。结果表明:(1)随氧化温度升高,由于氧化致密层的形成,试样氧化增重速率降低,在1500℃氧化试样由于气泡破裂严重,氧化面积增大使氧化增重率有所提高;(2)随氧化温度升高出现氧化钝化现象,使得Sialon结合SiC复相材料表现出很好的高温抗氧化性能;(3)高温氧化使得Sialon结合SiC复相材料常温抗压强度比氧化前提高;随氧化温度升高,氧化膜表面形成较多气泡和开口空洞,使耐压强度呈下降趋势。
High temperature oxidation behavior of Sialon-bonded SiC multiphase material was investigated in 1100-1500 ℃ by means of X-ray diffractometer,scanning electronic microscopy,mercury injection apparatus and thermogravimetry.The results showed that：（1）The oxidation weight increment rate of sample decreased with increasing oxidation temperature due to the formation of dense oxidation layer.The oxidation weight increment rate of sample oxidized at 1500 ℃ elevated owing to the increase of oxidation area resulting from the burst of surface bubble;（2）Oxidation passivation occured with the increase of oxidation temperature,so Si3N4-bonded SiC multiphase materials had excellent oxidation resistance;（3）High temperature oxidation resulted in the decrease of apparent porosity and increase of compressive strength at room temperature of Sialon-bonded SiC multiphase material.The compressive strength of samples oxidized at high temperature decreased with the increase of oxidation temperature as a result of formation and burst of surface bubble.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2012年第2期332-335,共4页
Bulletin of the Chinese Ceramic Society
