材料期刊网

Ti(3)SiC(2) joining has been successfully achieved by depositing a thin Cu or Zr layer on it and heat treating at low temperatures of 950 degrees or 1100 degrees C in an argon atmosphere, respectively, which are similar to 500 degrees C lower than the previous solid solution joining method. X-ray diffraction and scanning electron microscope analyses reveal that a continuous Cu(3)Si or Zr-silicide layer forms at the joint interface through the outward diffusion of Si atoms from the Ti(3)SiC(2) substrate into the deposited Cu or Zr layer. The strength of joints is evaluated by tensile bond-strength test and 4-point bending test methods. The Ti(3)SiC(2)/Cu/Ti(3)SiC(2) joints always fail from the substrate instead of from the bonding interface, while the Ti(3)SiC(2)/Zr/Ti(3)SiC(2) joints fail from the joint interface during tensile bond-strength test. The 4-point bending strength of Ti(3)SiC(2)/Cu/Ti(3)SiC(2) joints reaches a value of 238 MPa, which is 68% of the Ti(3)SiC(2) substrate. So joining using a Cu or Zr film as the interlayer followed by heat treating is a practical and efficient method for joining Ti(3)SiC(2).