Hot-dip Aluminized Coating on TZM Alloy

TZM alloy（Mo-0.5 Ti-0.08 Zr-0.02（wt%））is kind of a high temperature alloy of molybdenum base alloy which are widely used in high temperature nuclear reactor, aviation, electricity generation and as the high temperature resistance material and structural material of chemical industry. However, alloy in the high temperature is easy oxidation and so it will limit alloy's application field. After studies found when the temperature higher than 540℃ the molybdenum of TZM alloy will oxidation quickly to form non-protection MoO3 oxide layer. This oxide layer will volatilize at 750℃ and make molybdenum matrix oxide and volatilize which is bad for alloy’s properties.

Using hot-dip aluminized coating technique to make aluminized layer on TZM alloy surface to improve high temperature oxidation resistance. The hot-dip temperature is 730℃and hot-dip time is 3min or 5min. Clad layer is combine with surface aluminized layer and inner alloy layer and the inner alloy layer is mainly Al4Mo and Al5Mo phase. Besides, the micro-hardness of inner alloy layer reach at HV760. The clad layer and substrate is metallurgical bonding. What’s more, aluminized layer has good high temperature oxidation resistance property.

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