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Spherical TiC powder plasma preparation method and spherical TiC powder prepared thereby

A plasma and plasma technology, which is applied in the field of metal powder preparation, can solve the problems of power instability, powder vaporization, and low yield, and achieve the effects of high spheroidization rate, difficult vaporization, and high yield

Inactive Publication Date: 2018-05-22
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting point of TiC powder, but the quality of hydrogen, in order to ensure the arcing and stability of the plasma torch in the general radio frequency plasma technology, the flow rate of gas and side gas is relatively large, resulting in serious vaporization of the powder during melting and being a large amount Blow off, adhere to the chamber wall and fine powder collection tank, so that the yield is very low, and after many times of production, there will be a large amount of powder adhered to the plasma torch, resulting in unstable power, sticking to the plasma torch On the wall, the cooling effect and heat transfer effect are seriously reduced, and the equipment is damaged

Method used

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  • Spherical TiC powder plasma preparation method and spherical TiC powder prepared thereby
  • Spherical TiC powder plasma preparation method and spherical TiC powder prepared thereby

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Effect test

Embodiment 1

[0027] The present invention adjusts and controls air pressure and gas flow in the reaction vessel, mainly based on two parameters of gas flow and air pressure in the reaction vessel (such as figure 1 shown) for comprehensive adjustment. After research, the inventors found that in the traditional method, after the plasma is established, the pressure and gas flow in the reaction vessel are not adjusted and controlled, and the spheroidization is directly carried out. This will easily cause the TiC powder spheres to be easily vaporized and easily blown to the inner wall of the equipment. The inventor creatively adjusts the air pressure and gas flow in the container comprehensively after the plasma is ignited, so that the TiC powder balls are not easy to vaporize and are not blown to the inner wall of the equipment.

Embodiment 2

[0029] The schematic diagram of the experimental setup is as figure 2 As shown, it is composed of the following parts, the plasma reactor system, that is, the plasma generator, is used to generate the excitation electromagnetic field; the plasma torch, with side gas argon, side gas hydrogen and middle gas argon inside; powder feeding System and feeding gun; vacuum chamber; water cooling, stainless steel charging device, exhaust gas discharge system. The above-mentioned device is only a device model of the present invention, and does not limit this kind of preparation device. Any device that utilizes the principle of the present invention to prepare spherical TiC powder is within the scope of protection of the present invention.

Embodiment 3

[0031] A plasma preparation method of spherical TiC powder, comprising the following steps:

[0032] 1) Select TiC powder particles with a particle size of 40um to 50um;

[0033] 2) Perform plasma ignition; the operating parameters of plasma ignition are: the grid flow is controlled at 0.2A to 0.3A; the flow rate of argon gas in the middle gas is 5L / min; the flow rate of argon gas in the side gas is 20L / min;

[0034] 3) After successful ignition, adjusting and controlling the pressure and gas flow in the reaction vessel specifically includes: adjusting the pressure in the reaction vessel to 5 psia, adjusting the flow rate of argon gas in the middle gas to 5 L / min, adjusting the flow rate of argon gas in the side gas to 20 L / min, and adjusting the flow rate of the side gas to 20 L / min. The flow rate of gas and hydrogen is 30L / min; establish a stable argon-hydrogen plasma, and the radio frequency power is 5KW, so that TiC powder particles will not vaporize and be blown to the in...

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Abstract

The invention provides a spherical TiC powder plasma preparation method including the following steps: 1) selecting TiC powder particles with a particle size of 40 [mu]m to 200 [mu]m; 2) carrying outplasma ignition; 3) after the ignition is successful, adjusting and controlling the gas pressure and the gas flow quantity in a reaction vessel, and establishing stable argon gas-hydrogen gas plasma;4) allowing argon gas carrying the TiC powder particles to enter the plasma, and preparing molten TiC droplets; and 5) cooling and solidifying the molten TiC droplets, and thus obtaining the sphericalTiC powder. The invention also provides the spherical TiC prepared by the preparation method. The TiC powder provided by the invention has high spheroidization rate, is not easy to vaporize in the preparation process and cannot be blown away to the inner wall of the device, and can effectively control the dispersity of the particles, thereby being not collided and adhered with each other.

Description

technical field [0001] The invention relates to the technical field of metal powder preparation, in particular to a plasma preparation method of spherical TiC powder and the spherical TiC powder prepared by the method. Background technique [0002] TiC has high melting point, high bowl degree and good chemical stability. It is mainly used to manufacture cermets, heat-resistant alloys and hard alloys. The multi-phase composite material that can also be prepared by carbide TiC has a wide range of applications in mechanical processing, metallurgy and minerals, aerospace, fusion reactors and other fields. [0003] In the field of powder metallurgy, due to its good fluidity and uniform particle size distribution, spherical TiC has great development and application in the fields of compound mixing and coating. At present, the preparation method of spherical carbide TiC powder is still based on the traditional process, but it has many impurities and low spheroidization rate. [0...

Claims

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Application Information

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IPC IPC(8): C01B32/921
CPCC01P2004/32
Inventor 陈海霞刘志光陈锐肖震
Owner LONGYAN ZIJIN INNOVATION RES INST
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