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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 cause local melting, causing severe splashing of copper liquid and forming a concentrated ablation area, which cannot meet the requirements. Requirements for the use of contact materials for ultra-high voltage

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
Comparison scheme
Effect test

Embodiment 1

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

[0029] The mixed dissolved salt solution is atomized and dried, the temperature of the feed port is 250°C, the temperature of the discharge port is 80°C, and the rotation speed of the nozzle is 20000r / min to obtain the oxide mixed powder precursor, and then the oxide powder precursor is mixed in the air Calcined the body, kept at 300°C for 2 hours to remove water and part of...

Embodiment 2

[0034] (1) Prepare W-20Cu composite powder containing rare earth oxides by using mixed solution-atomization drying-calcination-high energy ball milling-(low temperature + high temperature) two-step hot hydrogen reduction method; weigh 97g of copper sulfate crystals, 128g of 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 a 10% nitric acid solution was added to adjust the pH value of the above solution to 3, and allowed to 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, the nozzle rotation speed is 30000r / min, and the oxide mixed powder precursor is obtained, and then The oxide powder precursor was calcined in the air, kept at 500°C for 1h to remove water and part of the complexing agent in the molten s...

Embodiment 3

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

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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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