Powder metallurgy TZM molybdenum alloy
TZM alloy（Titanium Zirconium Molybdenum alloys） is a commonly used molybdenum alloy, with excellent high temperature strength, good thermal conductivity and thermal expansion properties. It is widely used in aviation industry, electronics industry and material industry. General powder metallurgy TZM alloy by adding carbon black, titanium hydride powder, zirconium hydride powder to molybdenum powder, mixed and then hydrogen or vacuum sintering to prepare TZM alloy （Titanium Zirconium Molybdenum alloys）. Generally, the content of Ti in TZM alloy （Titanium Zirconium Molybdenum alloys） ranges from 0.45% to 0.55%, the content of Zr is from 0.08% to 0.12%, and the content of C is from 0.01% to 0.04%. Part of titanium and zirconium in TZM alloy prepared by powder metallurgy method is solically dissolved in molybdenum matrix, part of larger particles of titanium and zirconium still exist as simple substances, and part of titanium and zirconium combine with oxygen in the preparation process to form oxides. In addition, due to the large particles of carbon black, random uniform distribution after mixing, C, Ti, Zr atoms need to pass a long path of diffusion to meet, in order to react to form dispersed TiC, ZrC, so the number of formed is very small, so the high and low temperature strength of TZM alloy is low.
Using REDOX graphene as the carbon source for preparing TZM molybdenum alloy, REDOX graphene is evenly dispersed and adhered to the surface and pores of titanium hydride and zirconium hydride particles by taking advantage of its small size and the presence of oxygen-containing groups that are easy to disperse in solvent, and TiC and ZrC are directly in-situ formed in the subsequent sintering process. Or through the diffusion reaction to form TiC and ZrC, greatly increase the content of dispersed carbide in TZM molybdenum alloy, reduce the solid solution in the matrix Ti, Zr content, thereby increasing the high and low temperature strength and plasticity of TZM molybdenum alloy.
