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Molybdenum-Zirconium-Titanium alloy Sintering

What is molybdenum titanium alloy?

Molybdenum-titanium alloy is an alloy composed of metallic molybdenum as the base element and the alloying elements titanium and carbon. The representative grade is Mo-0.5Ti alloy, which is a molybdenum alloy containing 0.40%~0.55% (mass fraction) of titanium and 0.01%~0.04% (mass fraction) of carbon.

Molybdenum-titanium alloy is an alloy composed of molybdenum and titanium, the most famous being Mo-0.5Ti alloy. Most of the molybdenum-titanium alloys are made into alloy ingots by powder mixing, pressing and sintering, and then processed into materials. The process is simple and the yield is high.

There are two main sintering methods for molybdenum-zirconium-titanium alloys: hydrogen protection sintering and vacuum sintering.

1. Hydrogen protection sintering: The so-called hydrogen protection sintering is sintering in the state of hydrogen.

During the hydrogen protection sintering process, due to the reduction effect of hydrogen, the oxides in the molybdenum powder will be replaced by hydrogen, reducing the oxygen content in the material to less than tens of μg/g, but for the addition of titanium, zirconium, etc. Active element molybdenum alloys, due to the high activity of alloying elements, will react with impurity gases in hydrogen to form oxides, nitrides, hydrides, etc., resulting in high impurity content in molybdenum-zirconium-titanium alloys, which seriously affects its mechanical properties . Therefore, vacuum sintering is generally used for the sintering of molybdenum-zirconium-titanium alloys.

2. Vacuum sintering: Vacuum sintering is a method of sintering porcelain blanks under vacuum conditions, and its porosity is relatively small. Compared with hydrogen protection sintering, vacuum sintering effectively reduces the gas content of impurities such as oxygen and nitrogen in the molybdenum-zirconium-titanium alloy.

In the vacuum sintering process, generally a slight excess of carbon element (relative to the predetermined composition) is added to deoxidize the metal oxide through the reduction of carbon element. Among them, there are two main deoxidation mechanisms: metal oxides in the carbon reduction system produce metal carbides and copper and molybdenum dioxide undergo a disproportionation reaction under vacuum and high temperature to produce metal molybdenum and molybdenum trioxide gas is extracted. In the disproportionation reaction of metal oxides and molybdenum dioxide in the carbon reduction system, the temperature at which the two reactions start is related to the partial pressure of the product gas in the furnace. As the partial pressure of the product in the furnace decreases, the reaction start temperature gradually decreases. Therefore, increasing the vacuum degree in the furnace and reducing the partial pressure of the product gas can lower the temperature at which the deoxygenation reaction proceeds, which is beneficial to the deoxygenation.