摘要
用扫描电子显微镜、电子能谱仪、X射线衍射等研究了在Ar气氛中,经1150℃,10h等温热处理后,Si3N4/Fe,Si3N4/Fe3Al平面偶界面固相反应区的形貌、成分分布、显微结构及相组成。结果表明:Si3N4/Fe界面固相反应形成约120μm厚的反应区,Fe含量从Si3N4侧到Fe侧逐渐增加,反应区中的Si成分约为5%(原子分数),反应区主要由Fe(Si)固溶体构成,其中均匀地分布着细小的孔洞;Si3N4/Fe3Al界面固相反应形成约3μm厚的反应区,反应区具有比Fe3Al高得多的Al含量,反应区由FeAl,Fe(Al,Si)固溶体及三元化合物Al9FeSi3构成。Si3N4/Fe3Al具有比Si3N4/Fe高得多的界面化学相容性。
After Si3N4/Fe,Si3N4/Fe3Al couples had been heat treated at 1 150 ℃ for 10 h in Ar atmosphere, the morphologies, phases, microstructures and elemental distributions in the reaction zones of the couples were studied using a scanning electron microscope with an energy disperse spectroscopy analyzer and X-ray diffraction. The results show that there is a reaction zone about 120μm thick on the Si3Na/Fe interface by solid state reaction. The reaction zone is composed of Fe（Si） solid solution, in which many small pores are distributed uniformly. The Fe content in the reaction zone gradually increases from the Si3N4 surface to the Fe surface, and the Si content of the reaction zone is 5% in mole. The thickness of the interfacial reaction zone formed by the Si3N4/Fe3Al solid state reaction is about 3 μm. The reaction zone is composed of FeAl, Fe（Al, Si） solid solution and AIgFeSi3, and in which the A1 content is higher than in Fe3Al. The chemical compatibility of the Si3N4/Fe3Al system sample is much higher than that of the Si3N4/Fe system.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第5期871-876,共6页
Journal of The Chinese Ceramic Society
基金
安徽省自然科学基金(050440704)资助项目
关键词
氮化硅
铁三铝
界面固相反应
显微结构
相组成
silicon nitride
tri-iron aluminide
interfacial solid state reaction
microstructure
phase composition
