Deoxidation Mechanism of TZM Alloys during Vacuum Sintering
- Details
- Category: Molybdenum knowledge
- Published on 09 December 2015
- Written by yiping
- Hits: 430
There are two sintering methods of TZM alloy which are sintering with hydrogen protection and vacuum sintering. Sintering with hydrogen protection, due to alloy element has high activity they will react with foreign gas of hydrogen to form oxide, nitride, hydride and so on. So the impurity of TZM alloy stay at a high level and it also impact TZM alloy’s mechanical properties. On the other hand, using vacuum sintering, in order to reduce the oxygen content will add little excessive carbon through reducing action of carbon element to metal oxide and deoxidizing.
Research TZM alloy which add activity metal elements and carbon element oxygen content change in vacuum sintering and through thermodynamic calculation and analysis to research alloy’s deoxidation mechanism. After research found there are two kind of deoxidation mechanism:
1. The metal oxide of carbon reduction system will produce metal carbide and CO.
2.MoO2 in the vacuum high temperature will occurs disproportionated reaction to form Mo and MoO3 gas and the gas of MoO3 will be pulled out by vacuum system.
What’s more, to improve the vacuum degree of furnace and to reduce pratial pressure of product’s gas can benefit to decrease the temperature during deoxidation reaction and good for deoxidation.
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