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Tungsten alloy powder casting machining method

A processing method and alloy powder technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of long demoulding time, high cost, and long process, and achieve uniform size and easy control, which is beneficial to complete removal and avoid cracking effect

Pending Publication Date: 2021-03-30
SUZHOU MIMO METAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tungsten alloy material obtained by this method has high density and high strength, but there are problems of large number of molds, large tonnage of equipment required, long demoulding time, long process and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix the mixed tungsten alloy powder (as shown in Table 1) and the binder according to a certain ratio (mass ratio 92:8) and mix and stir for 40 minutes, then granulate, and then send it to the injection molding machine for injection molding in the mold to obtain the tungsten alloy green embryo. Among them, the injection temperature is controlled at 110°C, the mold temperature is 20°C, the injection pressure is 800bar, and the injection speed is 50mm / s; then the green tungsten alloy embryo is soaked in normal temperature n-heptane solvent for 6 hours and then dried; then Tungsten alloy green embryo embedded in Al after solvent degreasing 2 o 3 Staged thermal degreasing in powder, where Al 2 o 3 The average particle size is 5.5 μm; finally put the tungsten alloy green embryo after thermal degreasing into the molybdenum wire furnace 2 Sintering is carried out in a protective atmosphere, the sintering temperature is 1400°C, the sintering time is 180 min, and the ultra-...

Embodiment 2

[0036] The mixed tungsten alloy powder (mixed as shown in Table 1) and the binder were mixed and stirred according to a certain ratio (95:S5) for 40 minutes, then granulated, and then sent to an injection molding machine for injection molding in a mold to obtain a tungsten alloy green embryo. Among them, Control the injection temperature at 120°C, the mold temperature at 26°C, the injection pressure at 1200bar, and the injection speed at 80mm / s; then put the green tungsten alloy embryo into normal temperature n-heptane solvent for 10 hours and then dry it; after degreasing the solvent, the tungsten Alloy green embryo embedded in Al 2 o 3 Staged thermal degreasing in powder, where Al 2 o 3 The average particle size is 8.5μm, put the tungsten alloy green embryo after thermal degreasing into the molybdenum wire furnace for H 2 Sintering was carried out in a protective atmosphere, the sintering temperature was 1530 °C, the sintering time was 120 min, and the ultra-high densit...

Embodiment 3

[0038] The mixed tungsten alloy powder (as shown in Table 1) and the binder were mixed and stirred according to a certain ratio (98:S2) for 40 minutes, then granulated, and then sent to an injection molding machine for injection molding in a mold to obtain a tungsten alloy green embryo. Among them, Control the injection temperature to 140°C, the mold temperature to 35°C, the injection pressure to 1200bar, and the injection speed to 140mm / s; then put the green tungsten alloy embryo into normal temperature n-heptane solvent for 10 hours and then dry it; after degreasing the solvent, the tungsten Alloy green embryo embedded in Al 2 o 3 Staged thermal degreasing in powder, where Al 2 o 3 The average particle size of the tungsten alloy is 10 μm, and the tungsten alloy green embryo after thermal degreasing is put into the molybdenum wire furnace for H 2 Sintering was carried out in a protective atmosphere, the sintering temperature was 1600 °C, the sintering time was 180 min, a...

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Abstract

The invention discloses a tungsten alloy powder casting machining method. The method comprises the steps that S1, spherical tungsten powder is prepared; S2, mixed tungsten alloy powder is prepared; S3, injection molding is conducted, specifically, the mixed tungsten alloy powder and an adhesive are mixed and then made into granules, and then the granules are fed into an injection molding machine to be subjected to injection molding in a mold to obtain a tungsten alloy blank; S4, solvent degreasing is conducted, specifically, the tungsten alloy blank is put into a normal-temperature n-heptane solvent to be soaked for 6-10 hours and then dried for standby application; and S5, thermal degreasing is conducted, specifically, the tungsten alloy blank obtained after solvent degreasing is buried in Al2O3 powder to be subjected to segmented thermal degreasing, and is slowly cooled to the normal temperature to obtain an ultrahigh-density tungsten alloy powder casting. According to the method, tungsten alloy parts with ultrahigh density and ultrahigh shape complexity can be directly prepared, and the problems that in the prior art, machining is complex, energy consumption is large, the manufacturing cost is high, raw material waste is large, and the rate of finished products is extremely low are solved.

Description

technical field [0001] The invention relates to a processing method for tungsten alloy powder castings, belonging to the field of tungsten alloy castings. Background technique [0002] Tungsten has the advantages of high melting point, high density, high strength, high wear resistance, low thermal expansion coefficient, good corrosion resistance and oxidation resistance. Pure tungsten and ultra-high-density tungsten alloy materials have extensive and important applications in defense and military industry, aerospace, atomic energy and nuclear industry, electronic information and other industries. However, tungsten has inherent properties that are difficult to sinter and process, which limits its application. [0003] The traditional preparation method of tungsten alloy mainly adopts the powder metallurgy method to prepare the billet, and then further increases the density by extrusion, including liquid phase sintering or solid phase sintering. The tungsten alloy material o...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/22B22F3/10C22C27/04C22C1/04
CPCB22F3/225B22F3/1025C22C27/04C22C1/045B22F2998/10B22F1/065B22F1/10B22F1/103B22F1/142B22F3/1007
Inventor 王林生
Owner SUZHOU MIMO METAL SCI & TECH
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