Preparation method of spherical powder of refractory material

A spherical powder and refractory technology, which is applied in the field of preparation of spherical powder of refractory materials, can solve the problems of low quality of spherical powder, low yield of spherical powder, difficulty in separating unspheroidized powder, etc., and shorten the melting time time, shorten the preparation cycle, and increase the surface tension

Inactive Publication Date: 2018-04-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent defects of irregularly shaped refractory material powders, the spherical powder yield of these two methods is low, which is 30% to 40%, and it is difficult to separate the unspheroidized powder
Resulting in poor quality spherical powders

Method used

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  • Preparation method of spherical powder of refractory material
  • Preparation method of spherical powder of refractory material
  • Preparation method of spherical powder of refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Step 1. Add 160 g of non-spheroidized tantalum powder and 20 g of polyvinyl alcohol aqueous solution into a mixer and mix for 60 minutes, then spray granulate to obtain spherical tantalum prefabricated pellets; the non-spheroidized tantalum powder The particle size of the polyvinyl alcohol solution is 10 μm, the mass concentration of the polyvinyl alcohol aqueous solution is 4%, the particle size of the prefabricated aggregate is 220 μm, and the porosity is 60%;

[0037] Step 2. Put the tantalum prefabricated pellet obtained in step 1 into a sintering furnace for vacuum sintering to obtain a tantalum prefabricated pellet body; the vacuum degree of the vacuum sintering is 1.0×10 -3 Pa, the heating rate is 2°C / min, the temperature is 1400°C, and the time is 3h;

[0038] Step 3, set the power of the plasma equipment to 40kW, put the tantalum prefabricated pellet body obtained in step 2 into the quantitative powder fee...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] Step 1. Add 240g of non-spheroidized niobium-tungsten-tantalum alloy powder and 20g of polyvinyl alcohol aqueous solution into a mixer and mix for 60 minutes, then spray granulate to obtain spherical niobium-tungsten-tantalum alloy prefabricated pellets; The particle size of the chemically treated niobium-tungsten-tantalum alloy powder is 0.1 μm, the mass concentration of the polyvinyl alcohol aqueous solution is 6%, the particle size of the niobium-tungsten-tantalum alloy prefabricated pellets is 100 μm, and the porosity is 40%;

[0046] Step 2. Put the niobium-tungsten-tantalum alloy prefabricated pellets obtained in step 1 into a sintering furnace for hydrogen atmosphere protective sintering to obtain the niobium-tungsten-tantalum alloy prefabricated pellet body; the hydrogen gas flow rate for the hydrogen atmosphere protective sintering is 5L / min, The heating rate is 10°C / min, the temperature of hydrogen atmosph...

Embodiment 3

[0052] This embodiment includes the following steps:

[0053] Step 1. Add 220g of tungsten carbide alloy powder without spheroidization treatment and 20g of polyvinyl alcohol aqueous solution into a mixer and mix for 30 minutes, then spray granulate to obtain spherical tungsten carbide alloy prefabricated pellets; The particle size of the tungsten carbide alloy powder is 1.8 μm, the mass concentration of the polyvinyl alcohol aqueous solution is 2%, the particle size of the tungsten carbide alloy prefabricated pellets is 50 μm, and the porosity is 20%;

[0054] Step 2. Put the tungsten carbide alloy prefabricated pellets obtained in step 1 into a sintering furnace for hydrogen atmosphere protective sintering to obtain a tungsten carbide alloy prefabricated pellet green body; the hydrogen flow rate for the hydrogen atmosphere protective sintering is 30 L / min, and the heating rate is The temperature is 5°C / min, the temperature of hydrogen atmosphere protection sintering is 1400°...

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Abstract

The invention discloses a preparation method of spherical powder of a refractory material. The method includes the steps that firstly, raw material powder of the refractory material and an adhering agent are mixed uniformly, then pelleting is performed, and prefabricated granules are obtained; secondly, the prefabricated granules are subjected to vacuum sintering or hydrogen atmosphere protectingsintering, and a prefabricated granule blank body is obtained; and thirdly, the prefabricated granule blank body is contained into a quantitative powder feeding device of a plasma device, and is fed into a high temperature area of a plasma generating device through a conveying pipeline under the gas effect to be molten and shrink so as to generate a compact sphere, then the compact sphere falls into a collecting tank, and the spherical powder of the refractory material is obtained. According to the preparation method of the spherical powder of the refractory material, the raw material powder of the refractory material is sintered after being subjected to pelleting, then plasma is adopted, the raw material powder of the refractory material is made to be molten rapidly, the spherical powderis generated through fast shrinking and nodulizing, the sphericity degree of the powder is improved, and generation of satellite powder and hollow powder is avoided, and finally the compact and uniform spherical powder, smooth and clean in surface and high in sphericity degree, of the refractory material is obtained.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and in particular relates to a method for preparing spherical powder of refractory materials. Background technique [0002] With the development of powder metallurgy near net shape technologies such as injection molding, 3D printing, and hot isostatic pressing, powder metallurgy near net shape parts have been widely used in aerospace, biomedical, machinery and other fields, and have shown great potential. market potential. The properties and particle size of the raw material powder are important factors that determine the precision and density of powder metallurgy near net shape parts. In order to further improve the quality and performance of powder metallurgy near-net-shape parts, the requirements for powder properties such as fluidity, bulk density, and sphericity are also getting higher and higher. Therefore, the preparation of high-performance powders has become a research hotsp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0848
Inventor 杨坤汤慧萍王建杨广宇刘楠贾亮许忠国
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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