TZM molybdenum alloy refers to aluminum alloy containing titanium 0.4~0.6%(wt), zirconium 0.08~0.12%(wt) and carbon 0.02 ~ 0.03% (wt), also known as molybdenum titanium zirconium alloy. Titanium and zirconium both play the role of solid solution strengthening and carbide dispersion strengthening in the alloy, and the composite titanium zirconium carbide is more stable than the single titanium carbide at high temperature, TZM molybdenum alloy has better high temperature strength and higher recrystallization temperature.
TZM alloy has the characteristics of high melting point, high strength, high elastic modulus, small linear expansion coefficient, low vapor pressure, good thermal conductivity, strong corrosion resistance and good mechanical properties at high temperature, so it can be widely used in many fields.
TZM alloy (molybdenum zirconium titanium alloy) common preparation methods are: arc melting - casting method and powder metallurgy technology.
1. Arc melting - casting method is to melt pure molybdenum with an arc and add a certain amount of Ti, Zr and other alloying elements by weight percentage, and then get TZM alloy (molybdenum zirconium titanium alloy) by conventional casting method.
2. Powder metallurgy has unique chemical composition and mechanical and physical properties, which cannot be obtained by traditional casting methods. The high-purity molybdenum powder was mixed with TiH2 powder, ZrH2 powder and graphite powder in a uniform proportion and then formed by cold isostatic pressing, and then sintered at high temperature in a protective atmosphere to obtain TZM blank. The billet was then rolled (forged at high temperature), annealed at high temperature, rolled (forged at medium temperature) at medium temperature, annealed at medium temperature to eliminate the stress, and then rolled (forged at medium temperature) to obtain TZM finished products. The rolling (forging) process of billet and the subsequent heat treatment have great influence on the properties, anisotropy and texture of the material.
TZM alloy (molybdenum zirconium titanium alloy) is usually prepared into bars and plates. Powder metallurgy can save large equipment such as vacuum consumable electric arc furnace, large extruder and forging hammer, and corresponding high temperature heating furnace, so as to simplify the working procedure, shorten the production cycle, reduce the consumption, improve the production capacity and yield, and thus greatly reduce the cost.
TZM alloy (molybdenum zirconium titanium alloy) widely used in military industry, such as valve body, rocket nozzle, gas pipeline and nozzle throat liner in torpedo engine. The main shaft of the platinum-rhodium-clad agitator used in the glass furnace of the color picture tube glass shell production line is to make use of its corrosion resistance to metal liquid.
In addition, TZM alloy (molybdenum zirconium titanium alloy) also widely used in nuclear energy equipment, such as radiation shield, support frame, heat exchanger, rail, etc.