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A production method and system for high billet strength tungsten powder

A production method and technology for high-pressure blanks, applied in the field of powder metallurgy, can solve the problems of low compaction strength and poor forming performance of tungsten powder, and achieve the effects of good pressing performance, simple preparation steps, and easy control of process parameters.

Inactive Publication Date: 2015-12-23
赣州江钨友泰新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] For this reason, the present invention uses ammonium paratungstate and purple tungsten oxide as raw materials, mixes ammonium paratungstate and purple tungsten oxide according to a certain ratio, and performs hydrogen reduction in a reduction furnace to obtain tungsten powder with high purity and high compact strength; or ammonium paratungstate and purple tungsten oxide The tungsten powder obtained after the direct hydrogen reduction of tungsten oxide is mixed in a certain proportion, and the compact strength of the powder reaches 3.0-5.0MPa, which can be widely used in the preparation of tungsten-based high-density, high-temperature-resistant tungsten products, and overcomes the tungsten powder produced by conventional processes. Poor formability and low green strength

Method used

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  • A production method and system for high billet strength tungsten powder
  • A production method and system for high billet strength tungsten powder

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Mix industrially pure ammonium paratungstate and purple tungsten oxide at a ratio of 3:7, and place them in a stainless steel boat, with a powder layer thickness of 10mm;

[0030] (2) Place the mixed powder in the step (1) of Example 1 in the high temperature zone of the reduction furnace, raise the temperature at a rate of 10°C / min, keep it at 900°C for 2 hours, and the hydrogen dew point is -45°C ;

[0031] (3) Pass the reduced powder through a 160-mesh sieve to obtain high compacted strength tungsten powder with an average Fsss particle size of 3 μm, and the compacted strength reaches 3.6 MPa.

Embodiment 2

[0033] (1) Place commercially pure ammonium paratungstate powder in a stainless steel boat, and the thickness of the powder layer is 8mm;

[0034] (2) Place the powder in the step (1) of Example 2 in the high temperature area of ​​the reduction furnace, raise the temperature at a rate of 10°C / min, keep it at 950°C for 2 hours, and the hydrogen dew point is -45°C ;

[0035] (3) the powder after reduction in the step (2) of embodiment 2 is crossed 160 mesh sieves, and is recorded as 1# tungsten powder;

[0036] (4) Put commercially pure purple tungsten oxide powder in a stainless steel boat, and the thickness of the powder layer is 10mm;

[0037] (5) Place the powder in the step (4) of Example 2 in the high temperature zone of the reduction furnace, raise the temperature at a rate of 10°C / min, keep it at 850°C for 2 hours, and the hydrogen dew point is -45°C;

[0038] (6) the powder after reduction in the step (5) of embodiment 2 is crossed 160 mesh sieves, is recorded as 2# t...

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Abstract

Disclosed is a method for producing high compact strength tungsten powder. Ammonium paratungstate and purple tungsten oxide serving as raw materials are uniformly mixed according to a certain proportion, mixed powder is placed into a hydrogen reduction furnace, the thickness of a material bed is 5-25mm, the mixed powder is heated up to 700-1100 DEG C at the speed of 5-20 DEG C / min and is directly reduced with hydrogen, holding time is 1-5 hours, the dew-point temperature of the hydrogen ranges from -40 DEG C to -65 DEG C, and finally, reduced powder is sieved to obtain the high compact strength tungsten powder. The tungsten powder produced by the method can be pressed into high-strength compact without adding any forming agents, the compact strength of the tungsten powder is as high as 3.0-5.0MPa, and a tungsten product made of the tungsten powder has the advantages of high density, fine high-temperature resistance, stable quality and the like. The preparation method and preparation steps are quite simple, and technological parameters of the preparation process are easily controlled.

Description

technical field [0001] The present invention relates to a production method and system of high compact strength tungsten powder, in particular to a method and system for producing high compact strength tungsten powder by direct hydrogen reduction using ammonium paratungstate and purple tungsten oxide as raw materials, belonging to the technical field of powder metallurgy. technical background [0002] At present, in order to prepare high-density, high-temperature-resistant tungsten products, higher requirements have been put forward for the pressing performance and forming performance of tungsten powder. Therefore, how to optimize the compaction performance and formability of tungsten powder is particularly important. [0003] The conventional tungsten powder preparation process is used to reduce different tungsten oxide raw materials with hydrogen. The prepared tungsten powder has the characteristics of complete particle development, relatively concentrated particle size di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
Inventor 魏柏万李志锋廉丽莠
Owner 赣州江钨友泰新材料有限公司
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