Molybdenum News Center

Hypoxia TZM Alloy

TZM alloy having high oxygen content will reduce the second phase dispersion strengthening effect, resulting in mechanical properties decrease. Besides, under high temperature and vacuum environment alloy’s service life is decrease and application is limited. TZM alloy oxygen content control can from two ways, to control the oxygen content of the raw material and to control production parameter.

To produce hypoxia TZM alloy can choose hypoxia molybdenum powder as raw material, by vacuum mixing, and then put mixed powder into special drum with vacuum preservation or argon gas protection. But during charge and pressing process without any protection, molybdenum powder surface will absorb water vapor or oxygen, resulting in the oxygen content of alloy has increased. The oxygen content of alloy is hard to below 500 × 10^-6, and the vacuum mixing is difficult.

In addition, you can also add carbide in the raw materials to reduce the oxygen content in the alloy. In general, as long as the unlimited increase in C content, TZM alloy oxygen content can be effectively controlled. But carbide increasing has a greater impact on subsequent processing, thereby reducing the mechanical properties of the alloy.

Specific ways to reduce the oxygen content of TZM alloy are as following:
1. Molybdenum powder oxygen content is controlled between 200 ~ 600 × 10^-6;
2. Reduce doping, mixing, pressing and sintering process oxygen adsorption;
3. From the thermodynamic aspects may reduce Ti and Zr oxides formation, or using strong reducing elements to restore Ti and Zr oxides;
4. Adjust the sintering process parameters to control the alloy’s oxygen content.

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