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A kind of preparation method of high-pressure billet strength tungsten powder

A high-strength, tungsten powder technology, applied in the field of tungsten industry, can solve problems such as cracks or edge drop, insufficient compacts, etc., and achieve the effects of simple process, improved compact strength, and low energy consumption

Active Publication Date: 2021-07-23
GUANGDONG XIANGLU TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the compact does not have sufficient strength, it is prone to cracks or edge drop, corner drop, and collapse during forming or processing.

Method used

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  • A kind of preparation method of high-pressure billet strength tungsten powder
  • A kind of preparation method of high-pressure billet strength tungsten powder
  • A kind of preparation method of high-pressure billet strength tungsten powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Conventional powder preparation method: use YTO as a raw material for reduction in a reduction furnace, in which the thickness of the material layer is controlled between 8 and 14mm, the heating rate is 50°C / h, and the hydrogen dew point is -65°C to -70°C; five-zone reduction The temperature distribution is within the range of 750-900°C, and the residence time in the high-temperature zone is 150-160 minutes; the reduced powder is sieved twice with 80 / 160 mesh, and finally the conventional powder is obtained, which is sealed and stored.

Embodiment 2

[0028] Preparation method of high slab strength powder: After mixing BTO\PTO\YTO in the ratio of 2:5:10 in the double cone mixer for 2.0 hours, the mixture of these three tungsten oxides is used as the raw material, and the raw materials are laid flat Reduction is carried out in a reduction furnace in a boat. The material layer thickness is controlled between 10-12mm, the heating rate is 50°C / h, the hydrogen dew point is -70°C--75°C; the five-zone reduction temperature is 720°C for the first zone and 770°C for the second zone , The temperature of the third zone is 820°C, the temperature of the fourth zone is 860°C, and the temperature of the fifth zone is 920°C; the time of staying in each high temperature zone is 35min; the reduced powder is sieved twice with 80 / 200 mesh , and finally obtain a high green strength powder, which is sealed and stored.

[0029] Through the comparison of the above two processes, it is not difficult to find that the high pressure blank strength po...

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Abstract

The invention discloses a preparation method of high-pressure billet-strength tungsten powder. It includes the following steps: mix blue tungsten oxide\purple tungsten oxide\yellow tungsten oxide in a double cone mixer for 2.0~4.0h according to the mass ratio of 1~2:4~6:8~10; The mixture of three kinds of tungsten oxide is used as the raw material, and the raw material is placed in a boat and reduced in a reduction furnace; the thickness of the material layer is controlled between 10 and 12mm; the heating rate is set to 50°C / h, and the hydrogen dew point is ‑70℃~‑75℃, the five-zone reduction temperature distribution is in the range of 700~950℃, the residence time is 170~180min for reduction reaction; the reduced powder is sieved twice with 80 / 200 mesh, and finally the high compact strength is obtained Powder, sealed and stored. The invention does not require calcination and other intermediate processes, and directly mixes materials for reduction, has a simple process and low energy consumption, and the process is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of tungsten industry, in particular to a preparation method of high-pressure billet-strength tungsten powder. Background technique [0002] The melting point and hardness of metal tungsten rank first among all metals. The high melting point of tungsten combined with its high density makes it have special uses in civil and defense industries, such as manufacturing high-temperature structural parts and electronic components. In addition, tungsten alloy has a series of excellent physical and mechanical properties, which makes tungsten-based alloys widely used in the fields of national defense, aerospace, energy, metallurgical industry, etc., and occupies an important position in the national economy. [0003] In recent years, with the rapid development of my country's economy, the application of tungsten products has grown rapidly, and the demand for large-diameter thin-walled tubes and large-size thin tungsten plates th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 付胜戴湘平
Owner GUANGDONG XIANGLU TUNGSTEN
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