摘要
研究了急冷处理对氧化烧结氮化硅结合碳化硅复合材料强度的影响,结果表明,经急冷(1400℃)处理制备的试样强度有明显提高。通过X射线衍射仪(XRD)对材料进行物相分析和场发射扫描电镜(FE-SEM)观察材料的断面形貌,发现经1400℃急冷处理后的试样内部有大量碳硅石(moissanite)晶相出现,并且在Si3N4晶界处,生成了很多小颗粒,这些可能是试样强度提高的原因所在。
The effects of quenching on strength of Si3N4-SiC composite materials sintered in oxidizing atmosphere are studied in the paper. The results show that the bend strength of samples quenched （1400℃） increase obviously. It has been revealed that there are a lot of moissanite crystal phase in samples, and small particles in grain boundary of Si3N4, these small particles are helpful to increase samples＇ strength according to XRD and FE-SEM results.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2007年第10期53-55,共3页
China Ceramics
关键词
复合材料
氮化硅
碳化硅
急冷
氧化
烧结
composite materials, Si3N4, SiC, quench, sintered in oxidation
