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High Performance TZM Alloy Rod Production

TZM alloy rod can be used to produce the casting mold, rocket nozzle throat liner, nozzle, effuser and gas conduits and so on. High performance TZM alloy rod not only has long life, but also can produce high performance products, thus to development high-performance TZM alloy rod is conducive to expanding its application range.

TZM alloy rods usually produce by powder metallurgy method. Doped with 0.55% (wt) titanium hydride powder (TiH₂), 0.12% (wt) zirconium hydride powder (ZrH₂) and 0.05% (wt) carbon powder (C) into molybdenum powder, was placed in a V-type blender mixing tub for 24 hours, making powder well mixed. And the TiH₂, ZrH₂ and C powder’s purity is higher than 99.5%. Under the pressure of 196MPa pressed the mixed powder by isostatic pressing method and the material density is 7.2g/cm³. Through hydrogen the material sintered at induction heating sintered, and after sintering the blank density is more than 9.5g / cm³.

In TZM alloy related products, TZM alloy rod deformation processing is more difficult. If TZM alloy rod direct hot forge without extrusion, the alloy has low yield. Therefore, after sintered alloy rod should process hot extrusion to cogging and then forged. In the hot extrusion cogging and forging process, if you can control the heating temperature and the deformation quantity, the mechanical properties of alloy rods can be improved. However, due to the lack of technology, it is difficult to control the process parameters, so processing as this way will reduce the mechanical properties of the alloy. TZM alloy is kind of brittle material, during forging it is prone to cracking, and thus alloy rods should work with large deformation and quickly forged during forging. After extrusion cogging and forged molding TZM alloy rod has poor mechanical properties, but compared to other materials, TZM alloy can meet products’ performance requirement and has high yield.

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