液相法制备联碳－碳复合材料Si－W防氧化涂层中的晶粒长大  

GRAIN GROWTH IN A Si-W COATING FOR C / C COMPOSITES BY LIQUID REACTION-FORMATION

作　　者：成来飞[1] 张立同[1] 徐永东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室

出　　处：《材料研究学报》1996年第6期661-664,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金

摘　　要：研究了液相法制备Ｃ／Ｃ复合材料的Ｓｉ－Ｗ涂层及其在氧化试验中晶粒长大的过程实验结果表明：在涂层制备过程中，有液态Ｓｉ参与的Ｓｉ和Ｗ的液－固反应在生成ＷＳｉ２的同时，在被－固界面张力的作用下，ＷＳｉ２晶粒迅速靠近；在涂层氧化过程中，在ＷＳｉ２晶体界面能和液－固界面张力的联合作用下，ＷＳｉ２晶粒通过溶解－沉淀的方式发生异常长大．进一步的观察表明，涂层中的晶粒长大能提高涂层的防氧化性能．A multilayer coating for C / C composites with a outer layer by liquid reaction-formationmethod is prepared, and then the gum growth in the coating in the preparation and oxidation process is investigated. The results show that as WSi2 grains are formed by the liquid-solid reachon between the Si andW, they come in contact with each other forced by the liquid-solid interfacial tension in the prcness of coating preparation. Unusual groWth of WSi2 grains takes place through dissolve-predpitation manner in theoxidation process forced by interfacial energy of gains and the liquid-solid interfadal tension. The graingrowth in the coating is beneficial to its oxidation protection.

关 键 词：防氧化涂层 晶粒长大 复合材料 碳-碳 

分 类 号：TB332[一般工业技术—材料科学与工程]