Gel injection molding method for high-gravity alloy

Abstract

The invention discloses a gel injection molding method for high-gravity alloy, which belongs to the field of powder metallurgy. The method is characterized by comprising the following steps: firstly, weighing metal powder of tungsten, nickel, iron, copper, molybdenum, and the like used as raw materials with the average particle size of 1 to 100 micros according to a proportion, and ball-milling the metal powder for 1 to 20 hours to mix the metal powder evenly; then, mixing a monomer and a cross linker in a mass ratio of (1-250): 1, and dissolving the mixture into deionized water to obtain 10 to 55 percent solution; adding the evenly-mixed alloy powder and dispersant accounting for 0.01 to 5 percent of the volume of the alloy powder into the solution, ball-milling the mixture for 2 to 10 hours to form slurry with good fluidity, and exhausting the air for 5 to 60 minutes; and adding 0.02 to 2 percent of catalyst and initiator accounting for 0.02 to 5 percent of the mass of the monomer into the slurry, stirring the mixture evenly and slowing injecting the mixture into a die after exhausting, solidifying the mixture for 20 to 180 minutes at the temperature of between 20 and 70 DEG C, then releasing the solidified mixture from the die, drying the mixture for 30 to 120 hours in vacuum, and then sintering the mixture for 0.5 to 3 hours at the temperature of between 1,100 and 1,550 DEG C to obtain high-gravity alloy workpieces. The molded alloy workpieces have consistent performance, small weight dispersion degree, high size precision and high yield. The method does not need complex equipment and special degreasing process, and has simple process and low production cost.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and in particular provides a method for preparing high specific gravity alloy products with high solid phase content, excellent performance and complex shape by gel injection molding. Background technique [0002] High specific gravity alloys refer to the addition of nickel, iron, copper or other alloying elements to tungsten as a matrix, with a specific gravity of 17.0-18.5g / cm 3 between. Due to its advantages of high density, high strength and hardness, strong ability to absorb X-rays or γ-rays, high corrosion and oxidation resistance, good electrical conductivity, and low thermal expansion coefficient, it is often used as shielding materials, contact materials and armor-piercing projectile materials. Used in aerospace, energy, military, machinery and metallurgy and other fields. [0003] At present, there are two series of high specific gravity tungsten alloys, W-Ni-Cu ...

AI Technical Summary

Problems solved by technology

However, due to the influence of binders and degreasing, currently only parts with relatively complex shapes and small thickness (or diameter) (10mm) can be formed.

The development of large-thickness parts or other parts with large dimensions and cross-sectional changes with more complex shapes is restricted

For parts with large cross-section changes, large diameters (>80mm), small ring thickness and width, and large-diameter tungsten alloy armor-piercing projectile cores (greater than 20mm), the current powder injection molding technology is used. difficulty

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