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Effect of molybdenum on properties of tungsten - based alloy anvil block

  • Mosten
  • 16 Nov

High specific gravity alloy is a kind of tungsten based, adding a small amount of Cu, Ni, Co, Fe and other elements through liquid phase sintering alloy. It has high strength and hardness, good electrical and thermal conductivity characteristics. It is widely used in aviation, military and electrical industry, such as gyro rotor, kinetic energy penetrator, tungsten alloy armor penetrator, ray shielding material; Electric contact material, electric upsetting die, riveting machine, etc.

High specific gravity alloy is generally divided into Tungsten Nickel Copper and Tungsten Nickel Iron two series. Because the latter has higher strength and hardness than the former. Therefore, it is an ideal material for electric upsetting die. There have been many researches on the composition of W-Ni-Fe alloy. The W-Ni-Fe alloy with 90% tungsten content has the best strength and ductility. In the aspect of Ni Fe ratio, some studies show that the strength and plasticity of Ni Fe ratio is the best when the ratio is 2-4. It is also believed that Ni: Fe has the best comprehensive performance when it is between 1 and 3. When it exceeds this range, it is easy to form brittle intermetallic compounds. However, when Ni: Fe is higher, the ductility of the alloy increases and the strength hardness decreases.

Molybdenum is a kind of body-centered cubic metal, which can be miscible with tungsten. It also has a large solid solubility in Ni and Fe. Adding Mo to W-Ni-Fe alloy may have the effect of refining grain. In addition, Molybdenum also has the characteristics of good electrical and thermal conductivity. Therefore, the addition of Molybdenum may improve the strength, hardness and electrical conductivity of the alloy, which is important for the requirements of good conductivity and thermal conductivity, high temperature strength, hardness and oxidation resistance of the electric heating coarse anvil block material.