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Mosten Alloy Co., Ltd.

Effect of hot isostatic pressing on near net forming of tungsten shaped parts by plasma spraying

  • Mosten
  • 3 Dec

Tungsten has excellent properties such as high melting point, high density and good high temperature conductivity. It plays an important role in national defense industry and national economy, especially in aerospace, nuclear industry and other cutting-edge fields. With the rapid development of national defense industry and national economy, tungsten and tungsten alloy thin-walled or complex shape parts are increasingly widely used in various departments. Typical examples include nozzle throat lining of solid rocket motor, nozzle for attitude and orbit control satellite motor, crucible for rare earth and nonferrous metals smelting, quartz glass melting and heating body for induction furnace.

At present, the preparation technology of thin-walled or complex shape tungsten components is an internationally recognized problem. The traditional methods include chemical vapor deposition (CVD), physical vapor deposition (PVD), self propagating high temperature synthesis (SHS), powder metallurgy PM, etc. The relative density of PM cold pressed green billets is only 60 ~ 65%, and the volume shrinkage is as high as 30 ~ 40% in the subsequent high temperature sintering process, resulting in serious deformation, cracking or collapse of thin-walled or complex shaped parts. However, CVD, PVD, SHS and other methods have long production cycle, low forming efficiency and high processing cost. The development of material science urgently needs the follow-up of new forming and processing methods. Because of its spray temperature as high as 10000 ℃ and spray speed of 300 ~ 400m / s, plasma spray forming technology is very suitable for fusion bonding of tungsten based refractory metal powder. The results show that the powder can be directly sprayed onto the preformed core mold, the deposition efficiency of the powder can reach 8kg / h, the coating thickness can be accurately controlled (the error is within the range of + / - 0.025mm); the plasma spraying construction is flexible, and is not limited by the size and shape of the formed parts. Therefore, using plasma spraying technology to prepare various kinds of thin-walled or complex shape tungsten components is easy to realize its short process precision near net forming.

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Tungsten