Effective and controllable preparation method of framework with multi-polar hole structure

A multi-pole hole and skeleton technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of tungsten skeleton pore distribution, etc., and achieve the effects of low arc ablation rate, high withstand voltage strength and high mechanical strength

Pending Publication Date: 2020-10-16
XIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an effective and controllable method for preparing a skeleton with a multipolar pore structure, which solves the problem of tungsten skeleton pore distribution in the preparation process of tungsten-copper composite materials

Method used

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  • Effective and controllable preparation method of framework with multi-polar hole structure
  • Effective and controllable preparation method of framework with multi-polar hole structure
  • Effective and controllable preparation method of framework with multi-polar hole structure

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preparation example Construction

[0024] The present invention provides an effective and controllable method for preparing a skeleton with a multipolar porous structure, which is specifically implemented according to the following steps:

[0025] Step 1, first prepare spherical aggregate tungsten powder by flame spraying reduced tungsten powder, and prepare spherical tungsten powder with porous structure;

[0026] Among them, the scanning electron microscope (SEM) morphology of tungsten powder is as follows: figure 1 As shown, the initial powder presents a typical bimodal particle size distribution, that is, it is composed of two parts with a particle size of 15-40 μm and 40-63 μm; figure 1 It can be seen that spherical tungsten powder is made of a large number of unreduced tungsten powder agglomerates, and its shape is irregular, such as rods, rods, etc., and the particle size is different. Multiple particles gather together to form honeycomb through holes with developed surface area; It can be seen that the...

Embodiment 1

[0034] Step 1, firstly prepare spherical aggregate tungsten powder by flame spraying reduced tungsten powder, obtain spherical tungsten powder with a particle size of 15 μm, and the powder appearance is as follows figure 1 As shown, the content of Ct in tungsten powder is 0.16%-0.20%; the content of Ti is 0.0004%-0.0006%, the content of Al and Mn is 0.0440%-0.0460%; the content of O is 0.04%-0.06% %;

[0035] Step 2, using spark plasma sintering technology to prepare a tungsten skeleton with a multi-pole structure, and placing spherical tungsten powder with a particle size distribution of 15 μm in a graphite module with an inner diameter of 40 mm. The module is then loaded into the SPS device (Germany Raunstein FCT System Co., Ltd. HP D25); an axial pressure of 16Mpa is applied on the powder bed, and then increased to 40Mpa; after that, vacuum sintering is carried out at 1450°C with a heating rate of 100 ℃ min -1 and 50°C min -1 , the holding time is 5 minutes; in the cooli...

Embodiment 2

[0038] Step 1, firstly prepare spherical aggregate tungsten powder by flame spraying reduced tungsten powder, and obtain spherical tungsten powder with a particle size of 63 μm, the powder appearance is as follows figure 1 As shown, the content of Ct in tungsten powder is 0.16%-0.20%; the content of Ti is 0.0004%-0.0006%, the content of Al and Mn is 0.0440%-0.0460%; the content of O is 0.04%-0.06% %;

[0039]Step 2, using spark plasma sintering technology to prepare a tungsten skeleton with a multi-pole structure, and placing spherical tungsten powder with a particle size distribution of 63 μm in a graphite module with an inner diameter of 40 mm. The module was then loaded into the SPS device (HP D25, FCT Systems GmbH, Raunstein, Germany), and an axial pressure of 16Mpa was applied on the powder bed, and then increased to 40Mpa. Afterwards, vacuum sintering was carried out at 1500 °C with a heating rate of 100 °C min -1 and 50°C min -1 , the holding time is 5min; in the coo...

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Abstract

The invention discloses an effective and controllable preparation method of a framework with a multi-polar hole structure. The preparation method specifically comprises the following steps of S1, reducing initial tungsten powder by flame spraying to prepare spherical aggregate tungsten powder; and S2, preparing a tungsten framework of the multi-polar hole structure from the spherical aggregate tungsten powder prepared in the S1 by adopting a discharge plasma sintering technique. The preparation method provided by the invention solves the problem of preparing the tungsten framework of the multi-polar hole structure in a process of preparing a copper-tungsten alloy by an infiltration sintering method.

Description

technical field [0001] The invention belongs to the technical field of alloy microstructure refinement, and in particular relates to an effective and controllable preparation method of a skeleton with a multipolar pore structure. Background technique [0002] Tungsten copper (W-Cu) composite material has high melting point, high hardness, high strength, Low cost and other excellent performance, widely used in automobiles, aerospace, furnace components, electronics, medical equipment, sports equipment, welding electrodes, nuclear power plants and other fields. However, due to the large difference in physical and chemical properties such as melting point, thermal expansion coefficient and density of tungsten and copper, they can neither dissolve each other nor form intermetallic compounds. Therefore, in the process of preparing copper-tungsten alloy by traditional infiltration and sintering method, the seepage of copper liquid in the tungsten skeleton with discontinuous mutat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C27/04B22F1/00
CPCC22C1/08C22C27/04B22F1/145
Inventor 杨鑫张兆洋王犇马文君王婉琳邹军涛
Owner XIAN UNIV OF TECH
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