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Method for preparing spherical wolfram carbide powder

A technology of tungsten carbide powder and tungsten carbide, which is applied in the field of preparing spherical tungsten carbide powder, which can solve the problems of long process flow, low production efficiency, and difficulty in tungsten carbide dispersion control.

Inactive Publication Date: 2012-09-19
赣州海盛钨业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dispersion control of cast tungsten carbide at ultra-high temperature is difficult, the process is long, and the production efficiency is low

Method used

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  • Method for preparing spherical wolfram carbide powder
  • Method for preparing spherical wolfram carbide powder
  • Method for preparing spherical wolfram carbide powder

Examples

Experimental program
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Embodiment 1

[0027] Example 1: The average particle size of raw material casting tungsten carbide powder is 50 μm, the input power of argon plasma during the spheroidization process is 30 kW, and the negative pressure of the system is maintained at 130 mm Hg. The main plasma working gas argon and the auxiliary gas hydrogen pressure are both 0.5MPa. The pressure of the carrying gas nitrogen is 0.6MPa, the flow rate of the carrying gas is 600L / h, and the feeding rate of tungsten carbide powder is 40g / min.

Embodiment 2

[0028] Example 2: The average particle size of raw material casting tungsten carbide powder is 70 μm, the input power of argon plasma during the spheroidization process is 35 kW, and the negative pressure of the system is maintained at 180 mm Hg. The main plasma working gas argon and auxiliary gas hydrogen pressure are 0.6MPa. The pressure of the carrying gas nitrogen is 0.75MPa, the flow rate of the carrying gas is 700L / h, and the feeding rate of tungsten carbide powder is 35g / min).

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Abstract

The invention relates to a method for preparing novel thermal spraying powder material, in particular to a method for preparing spherical wolfram carbide powder. The method for preparing spherical wolfram carbide powder comprises the following steps: heating casting tungsten carbide powder raw material by establishing a stable argon plasma and adjusting a plasma parameter, and cooling and solidifying the casting tungsten carbide powder raw material to obtain the wolfram carbide powder. Compared with the traditional casting tungsten carbide powder, the obtained wolfram carbide powder has better flowability, purity and surface smoothness of particles, and lower porosity of the powder size. With the method provided by the invention, the problems that the traditional casting tungsten carbide powder has poor flowability, low apparent density, poor use performance and the like because of the shapes of slices, strips, plates and the like are solved, the shapes of the particles are changed, and the pelletizing ratio is high. The performance density and the flowability of the powder are improved, the physical performance of the powder is improved, the service life of the product of the powder is prolonged, the additional value of tungsten products is increased, and the cost is low.

Description

technical field [0001] The invention belongs to a method for preparing thermal spraying high-tech powder materials, in particular to a method for preparing spherical tungsten carbide powder. Background technique [0002] In recent years, with the development of science and technology, the development of hard surface materials is very rapid, especially the continuous development of its application technology, such as HVOF method (supersonic thermal spraying), PTA method (plasma spraying), etc. Characteristics and performance put forward new requirements, and spherical tungsten carbide powder, as an important thermal spraying material, is playing an increasingly important role in various industries such as electronic information, metallurgy, and machinery. [0003] Compared with ordinary polygonal tungsten carbide powder, spherical tungsten carbide powder has remarkable characteristics. Spherical tungsten carbide powder has stable chemical composition, high hardness, fine equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34B82Y40/00C01B32/949
Inventor 曾庆宁罗文
Owner 赣州海盛钨业股份有限公司
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