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High specific gravity tungsten alloy material and preparation method for nano crystal block thereof

A high specific gravity, tungsten alloy technology, applied in the field of plastic forming technology and powder metallurgy, can solve the problems of not obtaining nanocrystalline bulk materials, increasing equipment investment, harsh sintering equipment, etc., to achieve a simplified material preparation process route and short sintering time , the effect of reducing the production cost

Inactive Publication Date: 2009-11-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the composition formula of tungsten alloy and the selection of sintering process, nanocrystalline bulk materials have not been obtained.
In addition, because the spark plasma sintering method mainly uses a single pulse current to sinter the powder, in order to realize the full sintering and densification of the powder body, a higher requirement is put forward for the peak intensity of the pulse current, which brings more stringent requirements on the sintering equipment. Requirements directly increase equipment investment, resulting in increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Formula of high specific gravity tungsten alloy

[0028] The components and their contents in terms of mass percentage are: tungsten W: 93.0%, nickel Ni: 4.5%, iron Fe: 1.5%, cobalt Co: 1.0%, containing unavoidable trace impurities;

[0029] Tungsten, nickel, iron and cobalt are all added in the form of simple substances. Among them, the diameter of tungsten powder is about 2.3-2.7μm, and the purity is ≥99.0%; the diameter of nickel powder is about 1-3μm, and the purity is ≥99.8%; iron powder Flat particle diameter is about 1-3μm, purity ≥99.5%; cobalt powder flat particle diameter is about 1-3μm, purity ≥99.0%;

[0030] Step 2: Mix the powder

[0031] Dry mix in V-0.002 type powder mixer for 24 hours according to the mass percentage of the above powder raw materials;

[0032] Step 3: High energy ball milling

[0033] The ball milling process was completed in a QM-2SP20 planetary ball mill, the material of the balls and the inner wall of the ball mill cylinde...

Embodiment 2

[0037] Step 1: Formula of high specific gravity tungsten alloy

[0038] The components and their contents in terms of mass percentage are: W: 93.0%, Ni: 3.5%, Fe: 2.0%, Co: 1.5%, containing unavoidable trace impurities.

[0039] Tungsten, nickel, iron and cobalt are all added in the form of simple substances. Among them, the diameter of tungsten powder is about 2.3-2.7μm, and the purity is ≥99.0%; the diameter of nickel powder is about 1-3μm, and the purity is ≥99.8%; iron powder Flat particle diameter is about 1-3μm, purity ≥99.5%; Co powder flat particle diameter is about 1-3μm, purity ≥99.0%;

[0040] Step 2: Mix the powder

[0041] Dry mix in V-0.002 type powder mixer for 24 hours according to the mass percentage of the above powder raw materials;

[0042] Step 3: High energy ball milling

[0043] The ball milling process was completed in a QM-2SP20 planetary ball mill, the material of the balls and the inner wall of the ball mill cylinder was YG8 hard alloy, the mass r...

Embodiment 3

[0047] Step 1: Formula of high specific gravity tungsten alloy

[0048] The components and their contents in terms of mass percentage are: W: 93.0%, Ni: 4.0%, Fe: 1.8%, Co: 1.2%, containing unavoidable trace impurities.

[0049]Tungsten, nickel, iron and cobalt are all added in the form of simple substances, among which, the diameter of tungsten powder is about 2.3-2.7μm, and the purity is ≥99.0%; the diameter of nickel powder is about 1-3μm, and the purity is ≥99.8%; Co powder Flat particle diameter is about 1-3μm, purity ≥99.0%; Iron powder flat particle diameter is about 1-3μm, purity ≥99.5%;

[0050] Step 2: Mix the powder

[0051] Dry mix in V-0.002 type powder mixer for 24 hours according to the mass percentage of the above powder raw materials;

[0052] Step 3: High energy ball milling

[0053] The ball milling process was completed in a QM-2SP20 planetary ball mill, the material of the balls and the inner wall of the ball mill cylinder was YG8 hard alloy, the mass r...

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Abstract

The invention relates to a preparation method of a high specific gravity tungsten alloy material and a nano crystal block. In the present invention, firstly, the tungsten, nickel, iron and cobalt powders are proportioned according to the following mass percentages: W93.0%, Ni3.5-4.5%, Fe1.5-2.0%, Co1.0-1.5%, and the rest are Trace impurities; after powder mixing, high-energy ball milling is carried out until the tungsten phase grains in the ball-milled powder are refined to the nanometer level, and then square wave DC pulse-constant current is used for rapid sintering, sintering pressure: 40MPa~50MPa, sintering time: 3 ~8 minutes, the nanocrystalline block high specific gravity tungsten alloy material can be obtained after sintering. The high-specific-gravity tungsten alloy of the invention has a reasonable formula, can help to obtain nanocrystalline sintered materials, and can improve the comprehensive mechanical properties of sintered materials. The invention obviously lowers the requirements for equipment, thereby reducing the cost, and is particularly beneficial to the localization of the production of bulk nanocrystalline high-density tungsten alloy materials.

Description

technical field [0001] The invention relates to plastic forming technology and powder metallurgy technology, in particular to a high-specific-gravity tungsten alloy material and a method for preparing nanocrystal blocks thereof. Background technique [0002] Due to its high density, excellent mechanical properties and good corrosion resistance, tungsten-based alloys have broad application prospects in the defense industry and civilian industry. The existing tungsten-based high-density alloys are mainly composed of matrix tungsten and binder phases such as nickel, cobalt, and iron, and are mainly prepared by methods such as hot isostatic pressing, radiation heating sintering, and induction sintering. Among them, due to the long sintering time and high sintering temperature of the hot isostatic pressing and radiation heating sintering methods, the structure of the sintered material obtained is relatively coarse, which is not conducive to improving the performance of the sinter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/04B22F9/04B22F3/105
Inventor 李小强李元元郑峰屈胜官夏伟
Owner SOUTH CHINA UNIV OF TECH
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