Rare-earth-oxide-doped W-Cu composite material and preparation method thereof

A technology of rare earth oxides and composite materials, which is applied in the field of nanomaterial technology and powder metallurgy, can solve problems such as splashing of copper liquid and failure to meet the requirements of ultra-high voltage for the use of contact materials, so as to improve sintering activity and suppress W-W phase Agglomeration, effect of improving sintering formability and forging performance

Active Publication Date: 2013-07-31
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the copper infiltration process, and the copper infiltration temperature exceeds 1200°C, it is easy to form a copper-rich area in a local area, and the vacuum arc gathers in the copper-rich area to ca

Method used

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  • Rare-earth-oxide-doped W-Cu composite material and preparation method thereof
  • Rare-earth-oxide-doped W-Cu composite material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] (1) Prepare W-5Cu composite powder containing rare earth oxide by a two-step thermal hydrogen reduction method of mixed solution-atomization drying-calcination-high energy ball milling-(low temperature + high temperature); weigh 31.8 g of copper chloride crystals and 271.9 g Ammonium metatungstate crystals, 2g yttrium nitrate crystals, 3g polyethylene glycol were dissolved in 660ml deionized water to prepare a solution with a concentration of 10%, and a 10% nitric acid solution was added to adjust the pH of the above solution to 4. And let it stand for 30 minutes to obtain a stable mixed salt solution;

[0029] The mixed dissolved salt solution is atomized and dried, the temperature of the inlet is 250°C, the temperature of the outlet is 80°C, and the nozzle rotation speed is 20000r / min to obtain the oxide mixed powder precursor, and then the oxide powder precursor is driven in the air The body is calcined, 300°C for 2h to remove the water and part of the...

Example Embodiment

[0033] Example 2

[0034] (1) Prepare W-20Cu composite powder containing rare earth oxide by a two-step method of mixed solution-atomization drying-calcination-high-energy ball milling-(low temperature + high temperature) thermal hydrogen reduction; weigh 97g copper sulfate crystals and 128g metatungstic acid Sodium crystals, 3g cerium nitrate crystals, and 3g triethanolamine were dissolved in 740ml deionized water to prepare a solution with a concentration of 30%, and 10% nitric acid solution was added to adjust the pH of the above solution to 3, and let it stand for 30 minutes. A stable mixed dissolved salt solution is obtained; the mixed dissolved salt solution is atomized and dried, the inlet temperature is 400°C, the outlet temperature is 150°C, and the nozzle rotation speed is 30000r / min to obtain the oxide mixed powder precursor, and then The oxide powder precursor is calcined in the air, the water and part of the complexing agent in the dissolved salt are removed by holdi...

Example Embodiment

[0038] Example 3

[0039] (1) Prepare W-30Cu composite powder containing rare earth oxides by a two-step thermal hydrogen reduction method of mixed solution-atomization drying-calcination-high energy ball milling-(low temperature + high temperature); weigh 125g copper nitrate crystals, 103g ammonium paratungstate crystals, 2g lanthanum nitrate crystals and 3g ethanolamine were dissolved in 770ml deionized water to prepare a solution with a concentration of 20%, and a 10% nitric acid solution was added to adjust the pH of the above solution to 3.5, and let it stand for 30 minutes to obtain a stable mixture Dissolving salt solution; the mixed dissolved salt solution is atomized and dried, the temperature of the inlet is 300℃, the temperature of the outlet is 100℃, and the nozzle rotation speed is 15000r / min to obtain the oxide mixed powder precursor, and then in the air The oxide powder precursor was calcined, and the temperature was kept at 400°C for 1.5 hours to remove the water ...

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Abstract

The invention provides a W-Cu composite material which is characterized by comprising the following components in percentage by mass: 5-30 wt% of Cu, 0.5-2 wt% of rare-earth oxide and the balance of W. The invention also provides a preparation method of the W-Cu composite material. The density of the composite material is up to 99.2%, the density uniformized coefficient of different positions is less than 5%, the room temperature tensile strength is greater than 900 MPa, the elongation percentage is greater than 10%, and the fracture toughness K1C is greater than 28 MPa.m<1/2>; and thus, the composite material satisfies the performance requirements of electric contact materials and liner materials for complete density, structure uniformity, ablation resistance and the like of the W-Cu alloy.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and powder metallurgy, in particular to a method for preparing a W-Cu composite material doped with rare earth oxides prepared by nanotechnology. Background technique [0002] The W-Cu composite material composed of W and Cu has the advantages of both W and Cu, that is, it has the characteristics of high density, high sound velocity, high thermal conductivity, high temperature resistance, and ablation resistance. It is widely used in electrical contact materials, rocket jets, etc. Throat lining materials and petroleum perforating bullet materials, etc. However, the traditional W-Cu composite material adopts mechanical alloying + high-temperature liquid phase sintering or infiltration method, and the W-Cu composite material has low density, poor structure uniformity, and weak ablation resistance, which restricts its application in aerospace, national defense and military industries, etc. App...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/05
Inventor 舒大禹陈强胡传凯张帷夏祥生康凤
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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