A kind of preparation method of fine grain high specific gravity tungsten alloy

Abstract

The invention discloses a preparation method of a fine-grained high-specific-gravity tungsten alloy, which comprises the following steps: (1) taking materials according to the ratio: 80-95 parts of pure tungsten powder, 5-20 parts of pure metal bonding phase powder; (2) raw materials Treatment: Dry the mixed powder under vacuum conditions, and then put it into the barrel of the powder feeder of the laser rapid prototyping system for standby; (3) Device preparation: Use high-purity argon to replace the atmosphere in the forming chamber, and then use the circulation purification method Reduce the water and oxygen content in the forming chamber; establish a three-dimensional model of the fine-grained high-density tungsten alloy sample to be processed, and perform layered slicing and path planning; (4) Laser preparation and forming: start the laser rapid prototyping system, coaxial output laser and The powder, according to the set slice information and scanning path information, is melted and deposited on the shaped substrate layer by layer. The method uses powder-feeding laser rapid prototyping technology to prepare fine-grained high-density tungsten alloys, which is simple, fast and efficient, and the size of the prepared tungsten grains is almost the same as that of the original tungsten powder.

Description

technical field [0001] The invention relates to the technical field of alloy material preparation, in particular to a method for preparing fine-grained high-density tungsten alloy by laser rapid forming technology. Background technique [0002] High specific gravity tungsten alloy is a two-phase alloy composed of tungsten particles and a bonding phase. There is also a certain solid solubility in the phase. High specific gravity tungsten alloys have a wide range of applications in aerospace, weapons, automobiles, energy, medical and other defense and civilian industries. [0003] Traditional high specific gravity tungsten alloys are generally formed by liquid phase sintering of raw tungsten powder with an average particle size of 0.5-6 microns and nickel, iron, copper and other powders with an average particle size of 1-6 microns. However, in the liquid phase sintering process The tungsten grains are dissolved and separated in the bonding phase, so that the original tungste...

AI Technical Summary

Problems solved by technology

However, the preparation process of this ultrafine / nanocomposite powder is complicated, and the subsequent preparation of fine-grained high-density tungsten alloy still needs to go through the processes of mixing, charging, pressing, and sintering. The entire manufacturing cost and manufacturing difficulty

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