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Nanocrystalline tungsten-based alloy block body material and preparation method thereof

A tungsten-based alloy and bulk material technology, applied in the field of nanocrystalline tungsten-based alloy bulk material and its preparation, can solve the problems of insignificant performance improvement effect, difficult to meet practical application requirements, etc., and achieve improved wettability and interface bonding. force, to achieve the effect of strengthening the binder phase and achieving a uniform distribution

Inactive Publication Date: 2009-05-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Paper "Preparation of W-4Ni-2Co-1Fe Alloy by Electric Field Activation Sintering" (Li Xiaoqiang, Zheng Feng, Li Yuanyuan, Powder Metallurgy Materials Science and Engineering, 2008, 13(2), 102~105) improved the adhesion of tungsten and tungsten by adding Co element. The interfacial bonding force between the junction phases improves the strength and ductility of the alloy to a certain extent. It is still due to the powder composition ratio and the selection of sintering process parameters. Although a near-nanocrystalline bulk tungsten alloy has been obtained, its performance The improvement effect is not obvious, and it is still difficult to meet the requirements of practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a nanocrystalline tungsten-based alloy bulk material comprises the following steps and process conditions thereof:

[0030] Step 1: Ingredients

[0031] The dosage of tungsten, nickel, iron, molybdenum and cobalt powder is calculated by weight percentage: W86wt%, Ni7wt%, Fe3wt%, Mo3wt%, Co1wt%, contain unavoidable trace impurities; W, Ni, Fe, Mo and Co powder All are added in the form of simple substances, wherein, the average particle diameter of W powder is about 2.0-2.5 μm, and the purity is ≥99.0%; the average particle diameter of Ni powder is about 1-3 μm, and the purity is ≥99.8%; the average particle diameter of Fe powder is about 1-3 μm, The purity is ≥99.5%; the average particle diameter of molybdenum powder is about 1-3 μm, and the purity is ≥99.5%; the average diameter of Co powder is about 1-3 μm, and the purity is ≥99.0%.

[0032] Step 2: Mix the powder

[0033] The Fe, Co, Ni powders and W, Mo powders formulated in step 1 were put ...

Embodiment 2

[0046] A method for preparing a nanocrystalline tungsten-based alloy bulk material comprises the following steps and process conditions thereof:

[0047]Step 1: Ingredients

[0048] The dosage of tungsten, nickel, iron, molybdenum and cobalt powder is calculated by weight percentage: W88wt%, Ni6.5wt%, Fe2.5wt%, Mo2wt%, Co1wt%, contain unavoidable trace impurities; W, Ni, Fe, Both Mo and Co powder are added in the form of simple substances, and their average particle diameter and purity are the same as those in Example 1.

[0049] Step 2: Mix the powder

[0050] Put Fe, Co, Ni powder and W, Mo powder in step 1 into V-0.002 type mixer and dry mix for 12 hours to get Fe-Co-Ni mixed powder and W-Mo mixed powder.

[0051] Step 3: High energy ball milling

[0052] The Fe-Co-Ni mixed powder and the W-Mo mixed powder after dry mixing in the step 2 are carried out each pre-ball milling respectively for 50 hours, until Fe, Co and Ni in the Fe-Co-Ni mixed powder form a solid solution ...

Embodiment 3

[0063] A method for preparing a nanocrystalline tungsten-based alloy bulk material comprises the following steps and process conditions thereof:

[0064] Step 1: Ingredients

[0065] The tungsten, nickel, iron, molybdenum and cobalt powder are dosed according to weight percentage: W86wt%, Ni7.5wt%, Fe2.5wt%, Mo2wt%, Co2wt%, contain unavoidable trace impurities; W, Ni, Fe, Both Mo and Co powder are added in the form of simple substances, and their average particle diameter and purity are the same as those in Example 1.

[0066] Step 2: Mix the powder

[0067] The Fe, Co, Ni powders and W, Mo powders formulated in step 1 were respectively put into a V-0.002 type mixer and dry mixed for 24 hours to obtain Fe-Co-Ni mixed powder and W-Mo mixed powder.

[0068] Step 3: High energy ball milling

[0069] The Fe-Co-Ni mixed powder and W-Mo mixed powder after dry mixing in step 2 were pre-ball milled for 30 hours and 60 hours respectively, until Fe, Co and Ni in the Fe-Co-Ni mixed po...

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Abstract

The invention relates to a plastic forming technique and a powder metallurgical technique, in particular to a nano crystal tungsten based alloy block material and a method for preparing the same. The block material comprises the following components in weight percentage: 86 to 88 percent of W, 6.5 to 7.5 percent of Ni, 2.5 to 3.5 percent of Fe, 2 to 4 percent of Mo and 1 to 2 percent of Co. The preparation method comprises the following steps: Fe-Co-Ni and W-Mo after dry mixing are ball milled in advance respectively until the Fe, Co and Ni completely form solid solution, and tungsten phase crystal grain is thinned to below 100nm; the Fe-Co-Ni and W-Mo are subjected to high energy ball milling until the Fe-Co-Ni is evenly distributed around the W-Mo crystal grain; and the discharge plasma rapid sintering is adopted. The nano crystal tungsten based alloy block material has the advantages of reasonable formula, even and thin microstructure, nearly full compact, higher hardness and tensile strength and good specific elongation, and the method for preparing the block material effectively improves the mechanical performances of the sintering material.

Description

technical field [0001] The invention relates to plastic forming technology and powder metallurgy technology, in particular to a nanocrystalline tungsten-based alloy bulk material and a preparation method thereof. Background technique [0002] Due to its high density, excellent physical and mechanical properties and good corrosion resistance, tungsten-based alloys have extremely broad application prospects in industries such as military, aviation, aerospace and electric meters. Existing tungsten-based alloys are mainly composed of matrix phase tungsten and binder phase nickel, iron, etc., and are mainly prepared by methods such as hot isostatic pressing and hot pressing sintering. However, due to the long sintering time and high sintering temperature of the hot isostatic pressing and hot pressing sintering methods, the structure of the sintered material obtained is relatively coarse, which is not conducive to improving the comprehensive performance of the sintered material. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/04B22F9/14
Inventor 李小强李元元幸红伟夏伟邵明屈盛官张大童杨超
Owner SOUTH CHINA UNIV OF TECH
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