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Production method for WC-Al4W pre-alloy powder

A technology of pre-alloyed powder and production method, which is applied in the production field of WC-Al4W pre-alloyed powder, can solve the problems of coarse powder particle size, difficult ball milling of material blocks, poor dispersion, etc., and achieve good high temperature oxidation resistance, easy ball milling, particle size small effect

Inactive Publication Date: 2013-07-31
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ni obtained due to this method 3 Al powder composition is not a single Ni 3 Al phase, NiAl, Ni and other phases also exist, the oxygen content of the powder is also high, and the sintered block is difficult to ball mill, resulting in coarse powder particle size and poor dispersibility

Method used

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  • Production method for WC-Al4W pre-alloy powder
  • Production method for WC-Al4W pre-alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 tungsten powder with an average particle size of 0.5 μm, 75.34% (mass percentage, the same below), aluminum powder with an average particle size of 20 μm, 22.23% and 2.43% carbon black were ball milled and mixed for 6 hours. The mixed materials are subjected to WC and Al in a carbonization furnace in a vacuum environment. 4 W synthesis reaction, the reaction temperature is 1200°C, and the reaction time is 4h. The synthesized product was cooled in a vacuum environment, ball milled for 4 hours, and sieved to obtain 40.0% WC and 60.0% Al 4 W's WC-Al 4 W pre-alloyed powder, the product data are shown in Table 1.

Embodiment 2

[0017] Example 2 The difference from Example 1 is that the reaction raw materials are 87.68% tungsten powder with an average particle size of 4.0 μm, 7.42% atomized aluminum powder with an average particle size of 30 μm, and 4.90% carbon black, and are ball milled for 5 hours. The reaction and cooling atmosphere is a 5KPa reducing atmosphere, the reaction temperature is 1600°C, and the reaction time is 5h. The synthetic product was milled for 6 hours to obtain 80.0% WC and 20.0% Al 4 The pre-alloyed powder of W, the product data are shown in Table 1.

Embodiment 3

[0018] Example 3 The difference from Example 1 is that the reaction raw materials are 89.24% tungsten powder with an average particle size of 2.0 μm, 5.56% aluminum powder with an average particle size of 100 μm, and 5.20% metallurgical grade carbon black, and are mixed by ball milling for 6 hours. The reaction and cooling atmosphere is a 15KPa reducing atmosphere, the reaction temperature is 2200°C, and the reaction time is 1h. The synthetic product was milled for 8 hours to obtain 85.0% WC and 15.0% Al 4 The pre-alloyed powder of W, the product data are shown in Table 1.

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Abstract

The invention provides a production method for WC-Al4W pre-alloy powder, comprising the following steps of: ball-milling and mixing the following materials in percentage by weight: 75.33-92.33% of wolfram powder, 1.85-22.24% of aluminium powder, and 2.43-5.82% of carbon black, and then synthesising WC and Al4W simultaneously, and ball-milling and sieving the synthesised product to obtain the WC-Al4W pre-alloy powder. The production method provided by the invention is simple in process, low in energy consumption, and suitable for industrial production; and the WC-Al4W pre-alloy powder containing, in percentage by mass, 40-95% of WC, and 5-60% of Al4W, is obtained, the WC phase and the Al4W phase in the pre-alloy powder are uniformly dispersed and without abnormally large aggregates, and the powder is low in the content of impurities.

Description

technical field [0001] The present invention relates to a kind of WC-Al 4 Production method of W pre-alloyed powder. Background technique [0002] Due to its high hardness, high wear resistance and good high temperature strength, WC-based cemented carbide has been more and more widely used in the fields of metal cutting, molds, mining and wear-resistant parts. However, the high temperature oxidation resistance of WC-based cemented carbide is poor, and the service life under high temperature conditions is short. If Al, which also has high hardness, is added to the alloy 4 The W phase can significantly improve the oxidation resistance of the alloy, and at the same time, due to the Al 4 The toughening effect of W relative to WC-based cemented carbide makes the ductility of WC-based cemented carbide significantly improved, and the weight is light. Chinese patent "A production method of tungsten carbide aluminum cemented carbide sintered body" (publication number CN101748305A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05B22F9/04
Inventor 陆必志龙坚战魏修宇
Owner ZHUZHOU HARD ALLOY GRP CO LTD