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Preparing method of carbon nanometer tube reinforced tungsten copper composite material

A technology of carbon nanotubes and composite materials, which is applied in the field of preparation of carbon nanotube-reinforced tungsten-copper composite materials, can solve the problems affecting the performance of WCu composite materials and the integrity of tungsten skeleton, so as to improve the performance of arc ablation resistance, Effect of improving wear resistance and improving mechanical properties

Active Publication Date: 2017-09-05
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WC, as an additional particle, will affect the integrity of the tungsten skeleton during the preparation process, thereby affecting the performance of the WCu composite material.

Method used

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  • Preparing method of carbon nanometer tube reinforced tungsten copper composite material
  • Preparing method of carbon nanometer tube reinforced tungsten copper composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, mix powder:

[0037] After mixing tungsten powder, copper powder and CNTs according to the ratio of 79% W, 20% Cu and 1% CNTs, they were mixed in a high-energy ball mill at a speed of 200r / min for 12 hours according to a ball-to-material ratio of 10:1 to make them evenly mixed to obtain WCu mixed powder with dispersed distribution of CNTs;

[0038] Step 2, suppress:

[0039] The mixed powder obtained in step 1 is pre-compressed and maintained on a hydraulic press according to the compactness of the green body after pressing to 40%, the pre-compression pressure to 200 MPa, and the holding time to 90s to obtain a composite material green body;

[0040] Step 3, liquid phase sintering and infiltration:

[0041] The composite material green body obtained in step 2 is heated in a computer-programmed high-temperature hydrogen atmosphere sintering furnace at a heating rate of 25°C / min. When the temperature reaches 1300°C, it is kept for 120 minutes and then cooled wit...

Embodiment 2

[0043] Step 1, mix powder:

[0044] After mixing tungsten powder, copper powder and CNTs according to the ratio of 75% W, 23% Cu and 2% CNTs, they were mixed in a high-energy ball mill at a speed of 300r / min for 10 hours according to a ball-to-material ratio of 3:1 to make them evenly mixed to obtain WCu mixed powder with dispersed distribution of CNTs;

[0045] Step 2, suppress:

[0046] The mixed powder obtained in step 1 is pre-compressed and maintained on a hydraulic press according to the compactness of the green body after pressing to 60%, the pre-compression pressure to 400 MPa, and the holding time to 60s to obtain a composite material green body;

[0047] Step 3, liquid phase sintering and infiltration:

[0048] The composite material green body obtained in step 2 is heated in a computer-programmed high-temperature hydrogen atmosphere sintering furnace at a heating rate of 20°C / min. When the temperature reaches 1400°C, it is kept for 80 minutes and then cooled with ...

Embodiment 3

[0050] Step 1, mix powder:

[0051]After mixing tungsten powder, copper powder and CNTs according to the ratio of 72% W, 25% Cu and 3% CNTs, they were mixed in a high-energy ball mill at a speed of 400r / min for 8 hours according to a ball-to-material ratio of 5:1 to make them evenly mixed to obtain WCu mixed powder with dispersed distribution of CNTs;

[0052] Step 2, suppress:

[0053] The mixed powder obtained in step 1 is pre-compressed and maintained on a hydraulic press according to the compactness of the green body after pressing to 50%, the pre-compression pressure to 340 MPa, and the holding time to 30s to obtain a composite material green body;

[0054] Step 3, liquid phase sintering and infiltration:

[0055] The composite material green body obtained in step 2 is heated in a computer-programmed high-temperature hydrogen atmosphere sintering furnace at a heating rate of 15°C / min. When the temperature reaches 1350°C, it is kept for 40 minutes and then cooled with th...

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Abstract

The invention provides a preparing method of a carbon nanometer tube reinforced tungsten copper composite material. The preparing method comprises the specific steps that at first, tungsten powder, copper powder and carbon nanometer tubes are added into a high-energy ball mill according to the proportion to be subjected to ball milling and mixed uniformly, and WCu mixed powder with the CNTs dispersed and distributed is obtained; then the mixed powder is pressed to obtain a composite material green body; and finally, the composite material green body is subjected to liquid phase sintering and infiltration in a high-temperature hydrogen atmosphere sintering furnace, and then the carbon nanometer tubes and the in-situ synthesis tungsten carbide mingled reinforced tungsten copper composite material are obtained. According to the preparing method, by means of the high-energy ball milling technology, the CNTs are dispersed and distributed on the surfaces of tungsten particles and copper particles, by means of high-temperature sintering, carbon sources of the surfaces of the tungsten particles and tungsten are subjected to an in-situ reaction to generate WC phases or W2C phases, the carbon sources of the surfaces of the copper particles will be dispersed and distributed in the copper phases, and then electric arc ablation resistant performance, wear resistance, high-temperature strength and the like of the WCu composite material are improved.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method of a carbon nanotube reinforced tungsten-copper composite material. Background technique [0002] Tungsten-copper (WCu) composite materials are widely used as ultra-high voltage (UHV) electrical contacts, heat sink materials, Welding electrodes and conductive and high temperature components. With the continuous deterioration of its service environment and the continuous increase of its service life requirements, more stringent requirements are put forward for WCu composite materials. Especially as an arc contact for high frequency opening and closing, in addition to the conventional thermal conductivity, electrical conductivity and arc ablation resistance, higher requirements are put forward for the high temperature strength and wear resistance of WCu composite materials. WC ceramic particles and W have similar properties in many aspect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F3/10
CPCC22C1/05B22F3/1007B22F3/1035
Inventor 张乔卓龙超梁淑华邹军涛肖鹏
Owner XIAN UNIV OF TECH
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