SiC/Ni_3Al界面固相反应(英文)  

INTERFACIAL SOLID STATE REACTION BETWEEN Ni_3 Al AND SiC

作　　者：赵学法[1] 汤文明[1] 曹菊芳[1] 高建杰[1] 吴玉程[1] 郑志祥[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《硅酸盐学报》2008年第8期1047-1052,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

摘　　要：使用扫描电子显微镜、电子能谱仪、X射线衍射仪对经1050℃等温热处理10h的SiC/Ni3Al界面固相反应层的成分分布、微结构及相组成等进行了研究。结果表明:SiC/Ni3Al界面固相反应层由Ni5.4Al1Si2、石墨态C及NiAl构成,反应物原子(Si,C,Ni和Al)在反应层中连续分布,均呈现下坡扩散的特征。反应层由随机C沉积区(random carbon precipitation zone,R-CPZ)及无碳沉积区(carbon precipitation free zone,C-PFZ)两个亚层构成。其中,R-CPZ靠近SiC侧,主要由Ni5.4Al1Si2构成,片状和颗粒状的石墨态C随机地分布其中;C-PFZ靠近Ni3Al侧,主要由Ni5.4Al1Si2及NiA构成,不含有石墨态C。The microstructure and the element distributions of the reaction zone in interface SiC/Ni3Al composite annealed at 1 050 ℃ for 10 h were studied using a scanning electron microscope with an energy dispersive spectrometer and X-ray diffractometer. The results show that the reaction zone on the interface of SiC/Ni3Al consists of Ni5.4Al1Si2, graphitic carbon and NiAl. The reactant atoms, i.e., Si, C, Ni, and Al, are distributed uniformly in the reaction zone through downhill diffusion. The reaction zone is composed of two sub-zones： the random carbon precipitation zone （R-CPZ） and the carbon precipitation free zone （C-PFZ）. The R-CPZ, adjacent to the SiC side face, contains the Ni5.4Al1Si2 matrix with the plate/sphere-like graphitic carbon precipitates randomly distributed. The C-PFZ, adjacent to the Ni3Al side face, contains Ni5.4Al1Si2 and NiAl without the graphitic carbon precipitates.

关 键 词：碳化硅 镍三铝化合物 反应偶 界面固相反应 

分 类 号：TB323[一般工业技术—材料科学与工程] O643.1[理学—物理化学]