TZM Alloy Boat

TZM alloy has many good properties, such as high temperature resistance, high strength, high melting point, high elastic modulus, low linear expansion coefficient, good corrosion resistance and good thermal conductivity, so it is widely used in various fields. TZM alloy is also often prepared to a boat for molybdenum powder production. As we knew, molybdenum powder should produce at high temperature environment, which is at least 1000 ℃. The boat used for containing molybdenum powder should have good high temperature resistance, not easily deformed, and at high temperature there is not oxidation reaction to produce impurities.

TZM alloy not only meet the above requirements, and using TZM alloy to make bout for molybdenum powder production can improvement the strength of powder, and also does not increase the impurity content of molybdenum powder. Titanium zirconium molybdenum alloy is made in a boat usually using a combination method, which is to mix stamping method with welding method. TZM alloy boat production processes are as following:

1. To obtain TZM alloy plates by vacuum furnace melting method or a powder metallurgy method.  The alloy boat molding temperature is about 600 ℃ and heating type is isothermal heating.
2. Select the GTAW welding process to weld TZM alloy. When the welding current at 210A, welding speed is 4mm/s and the argon gas flow rate is 8-12L / min, the weld of TZM is the best;

3. TZM alloy will oxidation at high temperatures, so during process, should do some oxidation resistance treatment. At 0 ~ 400 ℃, the oxidation rate of the alloy is slow and the surface will generate volatile MoO2. At 400 ~ 750 ℃, the alloy is rapidly oxidized and the surface will generate volatile MoO3. At 800-1000 ℃, alloy quality significantly fewer, because MnO3 is  evaporation.

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