复合陶瓷挺柱钎焊变形的研究及其控制

复合陶瓷挺柱钎焊后，由于陶瓷、金属线膨胀系数的不同，在挺柱中产生较大的残余应力和变形，从而影响其使用性能，通过试验，研究了影响挺柱变形的因素和规律。结果表明，钢套的强度和厚度、钎料的厚度、熔点及强度是影响挺柱焊后变形的主要因素，采用高屈服极限或者较厚的钢套时钎焊变形较小；钎料厚度较厚时钎焊变形较大，采用低熔点，低屈服极限的Sn基活性钎料可显著地降低钎焊变形，基本可能满足挺柱工作的表面凸起量要求。

Control of Brazing Deformation of Ceramic-metal Composite Cam Follower

Residual stress and deformation were induced as a result of the thermal expansion mismatch between the steel body and ceramic of the brazed ceramic metal composite cam follower. Different factors influencing the deformation were studied. The results showed that the brazing deformation was mainly influenced by the strength and thickness of the steel body, and the thickness, melting point and yield strength of the filler metal. Smaller deformation could be got when the steel body used had a bigger thickness or a higher yield strength. Thicker filler metal led to bigger deformation. The brazing deformation could be successfully reduced by using Sn based active filler metal, which had lower melting point and lower yield strength.