Manufacturing process of tungsten and molybdenum composite material

Abstract

The invention relates to a manufacturing process of a tungsten and molybdenum composite material. The manufacturing process comprises the steps: (1) tungsten powder and molybdenum powder are screened,and a small amount of copper powder is added; (2) a mixture is added into a ball grinding tank to be subjected to ball grinding and mixed; (3) tungsten and molybdenum mixed powder is pressed into a tungsten and molybdenum biscuit; (4) the tungsten and molybdenum biscuit is placed in a heating furnace to be heated to 800-1600 DEG C under a vacuum condition, heat preservation is conducted for 60-120 min, and a tungsten and molybdenum skeleton is obtained; (5) the tungsten and molybdenum skeleton is placed in a silicon nitride crucible, and the temperature is increased to 1100-1400 DEG C under the vacuum condition; and (6) the heating furnace is filled with argon, cooled to 1000 DEG C or below, and then naturally cooled to the room temperature, then discharging is conducted, and the tungstenand molybdenum composite material is obtained. The relative density of a tungsten and molybdenum alloy can reach 98%-99%, materials are saved, the process is simplified, and implementation is easy; and the impurity content in the tungsten and molybdenum composite material is low, tungsten grains are fine, the compactness is high, and the requirements of related products can be met.

Description

technical field [0001] The invention relates to the technical field of tungsten-molybdenum composite materials, especially a manufacturing process of tungsten-molybdenum composite materials. Background technique [0002] It is difficult for tungsten and molybdenum to form a real alloy. Generally, powder metallurgy is used to prepare a "false alloy", which is essentially a composite material. The tungsten billet prepared by powder metallurgy is impregnated or pressed with mixed powder The blank is then obtained by liquid phase sintering. At present, there is still a production process using tungsten and molybdenum mixed copper powder, which is usually powder mixing, forming, sintering, subsequent processing, or forming separately with tungsten powder and molybdenum powder, and stacking the immersion copper compact and the tungsten compact on the At a high temperature of 1200-1300 °C, the sintering and immersion copper process are combined. The biggest disadvantage of this t...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this technology is that the particle size of the powder is coarse, and the particle size of the powder does not have sintering activity. The solubility of tungsten in copper is only 10-5atm% at 1200°C. Although repressing and refiring or subsequent thermal processing can increase the product density, However, the cost increases, the efficiency decreases, and the tungsten grains are further coarsened during sintering, which cannot meet the requirements of the product.