RBSiC陶瓷素坯连接研究

RBSiC陶瓷素坯连接研究

张舸

【期刊名称】《红外与激光工程》 【年(卷),期】2014(000)0z1

【摘要】The join slurry is composed by silicon carbide (SiC) powder, phenolic resin and carbon black. Joining SiC green body after deairing, and then the reaction bonded SiC(RBSiC) joining mirror blank was prepared by reaction sintering. The relationship of the slurry formula and the microstructure of weld were discussed. The bending strength and the coefficient of thermal expansion of joining RBSiC ceramic were tested. The research shows that PEG200 and PVP can make carbon black dispersing homogeneous in the join slurry, and there is no residual carbon black in the weld after reaction sintering, so the microstructure of RBSiC ceramic is no different from the weld. The blending strength of joining green body and joining RBSiC ceramic are 24.9 MPa and 322.9 MP arespectively, and the fracture occurred in the base material. The ΔCTE of base and weld material is only 0.011 4 ppm during - 100- 400℃.%将碳化硅( Si C )微粉、酚醛树脂和炭黑等均匀混合，配置成连接浆料，真空除泡后连接SiC陶瓷素坯，高温反应烧结后得到反应烧结SiC(RBSiC)连接镜坯。讨论了浆料配方对焊缝显微结构的影响，测试了RBSiC连接坯体的力学性能和线膨胀系数。研究表明：连接浆料中加入聚乙二醇200(PEG200)和聚乙烯醇吡咯烷酮(PVP)，能够有效分散炭黑，保证反应烧结过程中炭黑与硅完全反