SPS sintering & joining based on preparation of tungsten-molybdenum composite target

Abstract

High energy ball milling and spark plasma sintering(SPS) were used to make high density pure W bulk, the relative density of samples can reach more than 97.0%. TZM alloy powder was laid on the surface of the W bulk, SPS was used to sinter TZM and join W with TZM at the same time. This experiment realized the joining between W bulk and TZM powder without interlayer. The effects of sintering temperature and cooling rate on the microstructure and mechanical properties of W/TZM alloy joints were investigated.The results show that W is well joined with TZM alloy, and there are no holes, microcracks and unwelded defects in the interface. When the sintering temperature is within the scope of 1400-1600℃, W/TZM joints shear strength increases with the increase of sintering temperature. The shear strength of the joints obtained by rapid cooling is higher than that of the joints with slow cooling at the same sintering temperature. When the sintering temperature is 1600℃ and taken rapid cooling, the shear strength of joint is higher than that of the other samples, the maximum shear strength is 159.7 MPa.

Keywords

• sps
• tungsten
• tzm alloy
• sintering
• target
• diffusion bonding