Preparation method of molybdenum-tungsten alloy powder

Abstract

The invention discloses a preparation method of molybdenum-tungsten alloy powder. The method comprises the steps that firstly, molybdenum trioxide and tungstic acid are added into diluted ammonia water to be dissolved to obtain an ammonium molybdate and ammonium tungstate mixed solution; secondly, the ammonium molybdate and ammonium tungstate mixed solution is sprayed and dried to obtain a molybdenum-tungsten composite oxide precursor; thirdly, the molybdenum-tungsten composite oxide precursor is subjected to roasting decomposition under the temperature gradient condition to obtain a molybdenum-tungsten composite oxide; fourthly, the molybdenum-tungsten composite oxide is subjected to first-stage reduction under the hydrogen condition to obtain a molybdenum-tungsten low-valence oxide; andfifthly, the molybdenum-tungsten low-valence oxide is subjected to second-stage reduction under the hydrogen condition to obtain the molybdenum-tungsten alloy powder. The molybdenum-tungsten alloy powder is prepared by fully mixing molybdate ions and tungstate ions and conducting roasting and reduction, so that size and mass differences of molybdenum particles and tungsten particles are small, hybrid power is high, the uniformity of the molybdenum-tungsten alloy powder is improved, and the problem of insufficient uniformity caused by mechanical mixing of molybdenum powder and tungsten powder is eliminated.

Description

technical field

[0001] The invention belongs to the technical field of powder material preparation, in particular to a method for preparing molybdenum-tungsten alloy powder. Background technique

[0002] Molybdenum and tungsten are the elements of the fifth and sixth periods of the sixth subgroup in the periodic table of elements, and they are refractory metals with relatively similar physical and chemical properties. Molybdenum and tungsten are mainly used in metal products, catalysts in petroleum smelting, and metal targets in the electronics industry in industrial production.

[0003] Molybdenum-tungsten alloy powder is the raw material for preparing molybdenum-tungsten alloy. The uniformity of molybdenum-tungsten alloy powder directly affects the high-temperature strength and service life of molybdenum-tungsten alloy. The traditional method of preparing molybdenum-tungsten alloy powder is a mechanical mixing method. The steps are: 1. Mechanically mix molybdenum powder a...

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