熔盐法Cf/SiC复合材料表面钛金属化研究

Ti Metallization of Cf/SiC Composites Surface by Molten Salt Reaction

摘要:

为了实现Cf/SiC复合材料与难熔金属的连接，通过熔盐法在Cf/SiC复合材料表面沉积钛金属层。用SEM和EDS研究金属化层的形貌及成分；用X射线衍射分析金属化层的相组织；用定量金相法测量钎焊料的铺展特性。研究表明：钛金属化层均匀致密，与基体结合紧密，钛金属可渗入纤维间孔隙，比较完整地包覆在Cf/SiC复合材料外表面。金属化层主要成分为TiC、Ti5Si3。金属化层与SiC界面分为3层，由内到外主要成分为Ti5Si3、TiC和Ti5Si3。表面金属化后的Cf/SiC复合材料与钛合金钎焊料润湿性明显改善，润湿角从153.9o降低为13.2o

Abstract:

Ti metallized coating was prepared on the surface of carbon fiber reinforced silicon carbide matrix (Cf/SiC) composite by molten salt reaction to make joining the composite with high melt point metals such as Ti. The morphologies and compositions of Ti metallized coating were analyzed by SEM and EDS. The phase components were assessed by XRD. The wettability of the solder was measured by quantitative metallography. The results show that Ti metallized coating is uniform and dense, and bound with the matrix closely. Ti can infiltrate into the gaps of the fibers, and cover the surfaces of the Cf/SiC composite. The main phases of the metalized coating consist of TiC and Ti5Si3. There are three transition layers between SiC and the metallized, i. e. Ti5Si3 layer, TiC layer and Ti5Si3 layer. The wettability of Cf/SiC composites surface to Ti is greatly improved by metallization, and the contact angle is deceased from 153.9° to 13.2° at 950 oC