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Porous tungsten blank with gradient continuous changing porosity degrees and preparation method

A gradient change, porous tungsten technology, applied in the field of powder metallurgy, can solve problems such as complex spatial geometric features

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous tungsten billet prepared by the present invention has a continuously changing porosity gradient from the surface of the material to the internal porosity, which is expected to solve the problem of preparing continuous gradient tungsten-copper-tungsten alloy parts with complex spatial geometric characteristics. Material creates conditions

Method used

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  • Porous tungsten blank with gradient continuous changing porosity degrees and preparation method
  • Porous tungsten blank with gradient continuous changing porosity degrees and preparation method

Examples

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Effect test

Embodiment 1

[0021] Example 1: Preparation of Porous Tungsten Blanks with Continuously Varying Porosity Gradients for High Temperatures

[0022] Mix 70% (mass fraction) 10-micron tungsten powder with 30% (mass fraction) 5-micron tungsten powder in a ball mill for 6-8 hours, then put the mixed tungsten powder into a rubber sleeve and perform cold isostatic at 300MPa Press treatment, the relative density of the green compact is 57%. The tungsten powder compacts were placed in a tubular electric furnace with flowing nitrogen for oxidation-gasification treatment of tungsten. In order to realize the oxidation-gasification treatment effect of the tungsten component, the nitrogen gas was introduced into a buffer bottle containing water to humidify before entering the electric tube furnace. The tungsten component was subjected to "oxidation-gasification" treatment for 1.5 hours at 970°C, and cooled with the furnace. It was then reduced in high purity hydrogen at 900°C for 1 hour. Finally, it wa...

Embodiment 2

[0023] Example 2: Preparation of Porous Tungsten Blanks with Continuously Varying Porosity Gradients at Room Temperature

[0024] First, mix 60% (mass fraction) of 10-micron tungsten powder with 40% (mass fraction) of 5-micron tungsten powder in a ball mill for 6-8 hours. Block samples were formed under pressure of 600-650 MPa, and the relative density of green compacts was 78%. The tungsten powder compacts were placed in a tubular electric furnace with flowing nitrogen for oxidation-gasification treatment of tungsten. In order to realize the oxidation-gasification treatment effect of the tungsten component, the nitrogen gas was introduced into a buffer bottle containing water to humidify before entering the electric tube furnace. The tungsten component was subjected to "oxidation-gasification" treatment for 2 hours at 870°C, and cooled with the furnace. It was then reduced in high purity hydrogen at 920°C for 1 hour. The porosity distribution in the porous tungsten blank i...

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Abstract

The invention discloses a porous tungsten blank with gradient continuous changing porosity degrees and a preparation method, and belongs to the technical field of powder metallurgy. In the porous tungsten blank, from the surface to the interior, the porosity degrees are distributed in a gradient manner from high to low, and continuously change. The preparation method comprises the steps that an original porous tungsten blank of which the relative density is 55 to 85% is put in a water vapor-containing inert atmosphere; through the high temperature oxidation-gasification treatment of water vapor for tungsten components, the tungsten components are volatilized and escape from the original porous tungsten blank, pore forming is achieved, and a porous tungsten rough blank with gradient continuous changing porosity degrees is obtained; and after cooling, high temperature reduction is carried out, and the porous tungsten blank with gradient continuous changing porosity degrees is obtained. The preparation method is simple in technology, convenient to operate, short in process and environment-friendly to use, can solve the preparation problem of continuous gradient tungsten copper alloy parts with relatively complex space geometrical characteristics, creates conditions for manufacturing continuous gradient tungsten copper composites, and is applicable to industrial application.

Description

technical field [0001] The invention relates to a porous tungsten blank with continuously changing porosity gradient and a preparation method, and belongs to the technical field of powder metallurgy. Background technique [0002] Tungsten-copper composite material combines the high hardness and high melting point of metal tungsten with the high thermal conductivity and excellent machinability of copper. Wide range of applications. For tungsten-copper alloys with a tungsten content (mass percentage) exceeding 45%, a homogeneous tungsten-copper composite material is usually prepared by copper infiltration technology based on a porous tungsten skeleton. With the development of science and technology, for example, the working temperature and pressure of a new generation of solid-fuel rocket motors have increased, and the scouring and ablation capabilities of high-temperature gas on the rocket throat lining have increased. The working time of sweat cooling effect is greatly sho...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C1/04B22F3/11C22C27/04
CPCB22F3/1143C22C1/04C22C1/08C22C27/04
Inventor 曹顺华肖彬马新星李世康
Owner CENT SOUTH UNIV
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