In-situ reaction mechanism and joint microstructure and properties of CuSnTi composite brazing material
Simplifying the preparation process of CuSnTi solder and reducing production costs are crucial for the development of high-performance tools.In this paper,direct mechanical mixing technique of Cu,Sn,and Ti metal powders was employed to synthesize CuSnTi brazing materials,which was then used to brazed PcBN/YG8 heterogeneous materials.The evolution of microstructures of CuSnTi brazing materials at different reaction temperatures were studied,the in-situ reaction mechanism of brazing materials during the brazing process was revealed,and the microstructure and properties of joint were analyzed.The results show that the in-situ reaction of CuSnTi brazing material can be mainly divided into three stages:in the first stage,Sn melts and reacts with Cu to form Cu6Sn5 and Cu3Sn in sequence;in the second stage,CuTi,Cu4Ti3,CuTi3,and CuSn3Ti5 precipitate surrounding Ti particles in sequence;in the third stage,liquid brazing material reacts with graphite substrate leading to the formation of TiC,and then solidification and precipitation of irregular CuSn3Ti5.PcBN/YG8 joints brazed with mechanical mixed powder brazing material and alloy powder brazing material both have good metallurgical bonding,with shear strengths of 96.06 MPa and 91.40 MPa,respectively.The joint brazed with mechanical mixed powder brazing material breaks at the PcBN site and exhibits excellent mechanical properties.
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维普
