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Tungsten carbide material with Ni3Al as cementing phase and preparation thereof

A technology of tungsten carbide material and binder phase, which is applied in the field of plastic forming technology and powder metallurgy, can solve the problem of low high temperature strength, high temperature creep resistance and corrosion resistance, difficult dimensional accuracy of sintered materials, and long time of radiation heating sintering method And other problems, to achieve the effect of relatively low sintering temperature, reduce material cost, and high hardness

Inactive Publication Date: 2008-12-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt is a national strategic resource, which is expensive, and its high temperature strength, high temperature creep resistance and corrosion resistance are relatively low, which limits the application of cobalt as a binder phase tungsten carbide to a certain extent.
Due to the long time of radiation heating sintering, large energy consumption, and high sintering temperature, the structure of the obtained sintered material is relatively coarse, and the performance of the sintered material is low; The accuracy is difficult, which also limits the application of this type of material to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0027] The WC, Ni, Al, and B powders are proportioned according to the following mass percentages:

[0028] WC: 95.00%,

[0029] Ni: 4.33%,

[0030] Al: 0.65%,

[0031] B: 0.02%,

[0032] Contains unavoidable trace impurities.

[0033] The WC raw material is WC powder produced by the blue tungsten powder along the hydrogen reduction carbonization method. The average particle diameter is about 3μm, and the grain size is about 0.5-0.8μm. The purity is greater than 99.9%.

[0034] Step 2: Preparation of cemented carbide powder by high-energy ball milling

[0035] One-time feeding ball milling is carried out according to the above-mentioned mass percentage of powder raw materials. The ball milling process is completed in a planetary ball mill. The material of the grinding ball is WC cemented carbide, the ball-to-material ratio is 10:1, the ball milling speed is 266r / min, and high-purity Ar...

Embodiment 2

[0041] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0042] The WC, Ni, Al, and B powders are proportioned according to the following mass percentages:

[0043] WC: 86.00%,

[0044] Ni: 12.13%,

[0045] Al: 1.81%,

[0046] B: 0.06%,

[0047]Contains unavoidable trace impurities.

[0048] The WC raw material adopts the WC powder produced by the hydrogen reduction carbonization method of blue tungsten powder. The average particle diameter is about 3 μm, and the crystal grain is about 0.5-0.8 μm; Ni, Al and B are added in the form of simple substances, and the average particle diameter of the powder is about 75 μm. The purity is greater than 99.9%.

[0049] Step 2: Preparation of cemented carbide powder by high energy ball milling

[0050] Perform one-time feeding ball milling according to the mass percentage of the above-mentioned powder raw materials. The ball milling process was completed in a planetary ball mill, the ball material was m...

Embodiment 3

[0056] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0057] Proportion WC, Ni, Al, and B powder according to the following mass percentages:

[0058] WC: 90.00%,

[0059] Ni: 8.67%,

[0060] Al: 1.29%,

[0061] B: 0.04%,

[0062] Contains unavoidable trace impurities.

[0063] The WC raw material adopts the WC powder produced by the hydrogen reduction carbonization method of blue tungsten powder. The average particle diameter is about 3 μm, and the crystal grain is about 0.5-0.8 μm; Ni, Al and B are added in the form of simple substances, and the average particle diameter of the powder is about 75 μm. The purity is greater than 99.9%.

[0064] Step 2: Preparation of cemented carbide powder by high energy ball milling

[0065] Perform one-time feeding ball milling according to the mass percentage of the above-mentioned powder raw materials. The ball milling process was completed in a planetary ball mill, the ball material was made of WC c...

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Abstract

The invention relates to a plastic forming technique and a powder metallurgy technique and provides a tungsten carbide material which adopts Ni3Al as binder phase and a preparation method thereof. The tungsten carbide material adopts toughening intermetallic compound Ni3Al to substitute cobalt with traditional binder phase and contains the following components according to mass percentage: 86 to 95 percent of WC, 5 to 14 percent of toughening Ni3Al. The preparation method comprises the steps: ball grinding is carried out to the raw materials according to the percentages until the size of WC powder crystal grain is thinned to be less than 100nm; current rapid sintering method is adopted to form solidified ball grinding powder, and the conditions of current rapid sintering process are as follows: types of sintering current: square wave pulsed current or constant current; sintering pressure: 10MPa to 50MPa; sintering time: 2 to 8 minutes. The plastic forming technique, the powder metallurgy technique and the tungsten carbide material of the invention can not only save strategic material cobalt, reduce material cost, but also effectively improve the performance of high temperature resistant and corrosion resistant performance of the material and have good promotion and application prospect.

Description

technical field [0001] The invention relates to plastic forming technology and powder metallurgy technology, in particular to a low-cost, high-performance, Ni 3 A tungsten carbide material with Al as a binder phase and a preparation method thereof. Background technique [0002] The existing tungsten carbide (WC)-based cemented carbide materials are mainly composed of matrix tungsten carbide and cobalt as a binder, and are mainly prepared by pre-forming and radiation heating sintering methods. Cobalt is a national strategic resource, expensive, and its high temperature strength, high temperature creep resistance and corrosion resistance are relatively low, which limits the application of cobalt as a binder phase tungsten carbide to a certain extent. In addition, due to the long time, high energy consumption and high sintering temperature of the radiation heating sintering method, the structure of the sintered material obtained is relatively coarse, and the performance of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/105
CPCY02P10/25
Inventor 李小强李元元郭亮屈盛官邵明夏伟
Owner SOUTH CHINA UNIV OF TECH
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