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Method for preparing elconite

A technology of tungsten-copper alloy and copper powder, which is applied in the field of preparation of tungsten-copper composite materials, can solve the problems of high gas content such as oxygen in nano powder, low tungsten content, difficulty in forming a skeleton, and low compact density.

Active Publication Date: 2009-01-28
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only prepare tungsten-copper alloys with a copper content of 5-25%, and it is difficult to form a stable skeleton if the tungsten content is too low
In addition, at present, there are more researches on the preparation of high-density tungsten-copper alloys by preparing tungsten-copper nanocomposite powders, which are also concentrated on tungsten-copper alloys with a copper content of less than 25%, and because there is a high oxygen content in the nano-powders. The problems of equal gas content and relatively low compact density make it difficult to achieve compaction by direct sintering in actual production.

Method used

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  • Method for preparing elconite
  • Method for preparing elconite
  • Method for preparing elconite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: the mass percentage of copper is 25%, the preparation of the tungsten-copper alloy that balance is tungsten

[0016] Copper powder with 5wt%, purity ≥ 99.5%, particle size of 15 μm, and tungsten powder with the same mass percentage as the tungsten in the tungsten-copper alloy with 25wt% copper content, that is, 75wt% by weight, 99.5% purity, The tungsten powder with a particle size of 4.2μm is put into the mixing cylinder, and a small amount of cemented carbide balls are added, mixed for 12 hours until the mixture is uniform, and the machine is turned off for 1 hour before unloading. The mixed material is molded under the pressure of 200Mpa (pressed into a disc with a diameter of 40mm in a steel mold, the following examples are the same), and the obtained compact is placed in a hydrogen furnace for pre-sintering. The sintering temperature is 950 ° C. hours, a tungsten-copper alloy skeleton is obtained. After cooling and unloading, measure the mass M=120g ...

Embodiment 2

[0019] Embodiment 2: The mass percent of copper is 35%, the preparation of the tungsten-copper alloy that balance is tungsten

[0020] Copper powder with 15wt%, purity ≥ 99.5%, and a particle size of 18 μm, and tungsten powder with the same mass percentage as the tungsten in the tungsten-copper alloy with a copper content of 35wt%, that is, 65wt% by mass and 99.5% purity, The tungsten powder with a particle size of 3.7μm is put into the mixing cylinder, and a small amount of cemented carbide balls are added, mixed for 12 hours until the mixture is evenly mixed, and the machine is turned off to cool for 1 hour before unloading. The mixture is molded under a pressure of 190Mpa (pressed into a disc with a diameter of 40mm in a steel mold), and the obtained compact is placed in a hydrogen furnace for pre-sintering at a sintering temperature of 900°C and kept for 1.5 hours to obtain tungsten copper Alloy skeleton. After cooling and unloading, measure the mass M=120g and volume V=1...

Embodiment 3

[0023] Embodiment 3: the mass percentage of copper is 40%, the preparation of the tungsten-copper alloy that balance is tungsten

[0024] Copper powder with 20wt%, purity ≥ 99.5%, and a particle size of 20 μm, and tungsten powder with the same mass percentage as the tungsten in the tungsten-copper alloy with a copper content of 40wt%, that is, the mass is 60wt%, and the purity is 99.5%, The tungsten powder with a particle size of 5.0 μm is put into the mixing cylinder, and a small amount of cemented carbide balls are added, mixed for 16 hours until the mixture is evenly mixed, and the machine is turned off to cool for 1 hour before unloading. The mixture is molded under a pressure of 180Mpa (pressed into a disc with a diameter of 40mm in a steel mold), and the obtained compact is placed in a hydrogen furnace for pre-sintering at a sintering temperature of 900°C and kept for 1 hour to obtain tungsten copper Alloy skeleton. After cooling and unloading, measure the mass M=120g a...

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Abstract

The invention discloses a making method of high-copper elconite with copper content at 25wt%-40wt%, which comprises the following steps: blending 5wt%-20wt% copper powder with purity over 99. 5% and grain size at 15-20um and tungsten 60-75wt% powder with purity over 99% and grain size at 3-6um evenly; moulding; shaping; controlling the degree of porosity lamda within 35%+-2%; sintering; obtaining the frame of elconite; calculating cupric cemented content; placing copper powder with purity over 99. 5% and grain size below 76um and copper piece with the same size as frame surface size on the elconite frame; loading in the graphite copple; adopting alumina to fill; heating to permeate copper.

Description

technical field [0001] The invention relates to the preparation of a tungsten-copper composite material, in particular to a preparation method of a tungsten-copper alloy with a copper mass percentage of 25% to 40% and a high copper content. Background technique [0002] Tungsten-copper alloy is a kind of composite material composed of tungsten and copper, which is evenly distributed in two phases and neither solid solution nor compound. And copper's high electrical conductivity, high thermal conductivity, plasticity and easy processing, and copper can absorb a large amount of arc energy when it evaporates at high temperature in the arc, reduce the arc temperature, improve the use conditions and reduce the electric corrosion. Due to the above advantages, tungsten copper alloy has been widely used as electrical contact and electrode materials, and more and more used in aerospace, nuclear industry and electronic industry as nozzle throat lining, electron beam target and packagi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/10C22C1/04B22F3/16C23C10/28
Inventor 刘孙和傅崇伟李鹏吴昊
Owner ZHUZHOU HARD ALLOY GRP CO LTD