High-billet-strength tungsten powder and preparation method thereof

A high-strength, tungsten powder technology, applied in the field of high-pressure billet-strength tungsten powder and its preparation, can solve problems such as unstable composition control, high production costs, and easy agglomeration of materials to block the furnace.

Active Publication Date: 2021-05-28
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the operation of traditional powder blending to prepare high-pressure billet tungsten powder is simple, it has the disadvantages of complicated process and small cost advantage
The tungsten powder produced by using high-phase blue tungsten as raw material can meet the demand for green compact strength, but the production of high-phase blue tungsten has disadvantages such as easy agglomeration of materials to block the furnace, high production cost, and unstable composition control.
[0004] Therefore, the preparation method of the existing high slab strength tungsten powder needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Using ammonium paratungstate as raw material, the transition state violet tungsten (violet tungsten 75wt%, WO 2 25wt%), wherein the temperature in the rotary kiln is 720-760°C, the slightly reducing atmosphere is ammonia, and the flow rate of ammonia is 0.7m 3 / h;

[0035] 2. Spread the transition state violet tungsten in a boat and reduce it under a hydrogen atmosphere to obtain a high compact strength tungsten powder. The thickness of the material layer is controlled at 12 mm, and the reduction adopts three stages of reduction (that is, the first reduction, the second reduction and third reduction), the hydrogen dew point is controlled at -65°C, the first reduction temperature is controlled at 680°C, the holding time is 1.2h, the second reduction temperature is controlled at 750°C, the holding time is 1.2h, and the third reduction temperature is controlled at 950°C ℃, holding time 1.2h;

[0036] 3. Pass the reduced high-pressure blank strength tungsten powder thr...

Embodiment 2

[0038] 1. Using ammonium paratungstate as raw material, the transition state purple tungsten (purple tungsten 85wt%, WO 2 15wt%), wherein the temperature in the rotary kiln is 740-770°C, the slightly reducing atmosphere is hydrogen, and the flow rate of hydrogen is 0.4m 3 / h;

[0039] 2. Spread the transition-state violet tungsten as the raw material in a boat, and reduce it in a hydrogen atmosphere to obtain high-pressure tungsten powder. , the second reduction and the third reduction), the hydrogen dew point is controlled at -70°C, the first reduction temperature is controlled at 730°C, the holding time is 1.2h, the second reduction temperature is controlled at 790°C, the holding time is 1.2h, the third reduction temperature Control at 940°C, holding time 1.2h;

[0040] 3. Pass the reduced high-pressure blank strength tungsten powder through a 200-mesh sieve to remove coarse particles and mechanical inclusions.

Embodiment 3

[0042] 1. Using ammonium paratungstate as raw material, the transition state purple tungsten (purple tungsten 95wt%, WO 2 5wt%), wherein the temperature in the rotary kiln is 700-740°C, the slightly reducing atmosphere is a mixture of ammonia and hydrogen, and the flow rate of ammonia is 0.3m 3 / h, the flow rate of hydrogen is 0.1m 3 / h;

[0043] 2. Spread the transition state violet tungsten as the raw material in the boat, the thickness of the material layer is controlled at 18mm, and reduce it in a hydrogen atmosphere to obtain high-pressure billet-strength tungsten powder. Among them, the hydrogen dew point is controlled at -75°C, and the first reduction temperature is Control at 750°C, holding time 1.5h, second reduction temperature at 840°C, holding time 1.5h, third reduction temperature at 950°C, holding time 1.5h;

[0044] 3. Pass the reduced high-pressure blank strength tungsten powder through a 200-mesh sieve to remove coarse particles and mechanical inclusions.

...

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Abstract

The invention discloses high-billet strength tungsten powder and a preparation method thereof. The preparation method comprises the step of reducing transition-state purple tungsten in a hydrogen atmosphere so as to obtain the high-billet strength tungsten powder. According to the method, the production cost is reduced while the tungsten powder with the billet strength larger than or equal to 3.5 MPa is stably prepared.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a high-slab-strength tungsten powder and a preparation method thereof. Background technique [0002] With the development of society and the continuous advancement of science and technology, the market demand for large-size tungsten sheets and large-diameter thin-walled tubes that are difficult to form is increasing. The increase in the quality requirements of end products has led to higher and higher requirements for the quality of powder raw materials in the downstream production chain, and good powder raw materials are the basis for the production of high-performance tungsten products and alloy products with high tungsten content. The current tungsten market is highly competitive and has been in a state of oversupply for a long time. In order to enhance market competitiveness, how to improve product quality and reduce production costs is particularly critical. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00
CPCB22F1/0003B22F9/22B22F2301/20B22F1/14Y02P10/25
Inventor 张龙辉徐国钻周俊安羊求民黄一春钟志强王红云
Owner CHONGYI ZHANGYUAN TUNGSTEN
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