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Mosten Alloy Co., Ltd.

Production flow of niobium-tungsten alloy powder

  • Mosten
  • 23 Aug

In order to prepare niobium-tungsten alloy powder with uniform particle size distribution, low oxygen and nitrogen content and high sphericity, a new preparation method was proposed. The method can also make up for the defects of traditional technology such as complicated process, uncontrollable process parameters and easy introduction of impurities.

A new production process of niobium-tungsten alloy powder:

1) Preparation of bar: tungsten, niobium, molybdenum, zirconium and other metal raw materials were hot-melted to form niobium-tungsten alloy liquid, and the niobium-tungsten alloy liquid was cast or forged to form niobium-tungsten alloy bar, and its was less than 0.05mm;

2) The surface of niobium-tungsten alloy bar is treated to ensure no pollution on its surface;

3) Vacuumization and inert gas replacement: the smelting chamber prepared by niobium-tungsten alloy powder was vacuumized, the limit vacuum was 0.3 Pa ~ 0.5 Pa, and the smelting chamber prepared by alloy powder was replaced 2 ~ 3 times by inert gas.

4) Smelting: Adopt the way of no crucible induction heating coil melted niobium tungsten alloy bars, the parameters of the induction coil (from 1, 2, 3, phi n) for (50100,10,3), adjust the power, make the niobium tungsten alloy melt pre alloy bars and produces continuous metal droplet, among them, the phi 1 to the bottom of the induction coil circle diameter, phi 2 for induction coil top circle diameter, φ3 is the inner diameter of induction coil, n is the number of turns of induction coil;

5) atomization: an open atomizer is used to atomize the metal droplets to form niobium-tungsten alloy powder;

6) Screening classification: in the inert gas protection state, different mesh number of niobium-tungsten alloy powder screening classification.

Note: The chemical composition of the niobium-tungsten alloy in step (1) as a percentage by weight is: The W content is 4.5-5.5%, Mo content is 1.7-2.3%, Zr content is 0.7-2.2%, O content is less than or equal to 0.01%, H content is less than or equal to 0.0015%, other impurities are less than 0.15%, the residual Nb, and its chemical composition is uniform.