A method for preparing high-strength and toughness cemented carbide with pre-alloyed powder

A technology of cemented carbide and pre-alloyed powder, which is applied in the field of powder metallurgy to prepare cemented carbide, which can solve the problems of affecting the performance of cemented carbide, high oxygen content of Al powder, easy to increase oxygen content, etc., and achieve stable product quality and uniform distribution , Good effect of process controllability

Active Publication Date: 2021-03-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, there is also a method of mixing WC powder with Ni powder and Al powder to prepare WC-Ni 3 Al mixed powder is used to prepare cemented carbide, but doing so will destroy the structure of WC and affect the performance of cemented carbide
This pre-synthesized Ni 3 Although the Al method also avoids the direct use of Al powder, it uses Al powder as a raw material in the synthesis process. The Al powder itself has a high oxygen content and it is still inevitable that the Al powder preferentially absorbs oxygen in the environment during the heating process to increase the oxygen content, resulting in Al 2 o 3 Inclusions are mixed in, and the oxygen content is easy to increase during the preparation process, which will eventually affect the performance of the cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to Co98.49wt.%, Ni1.31wt.%, Al0.4wt.%, prepare electrolytic cobalt, electrolytic nickel and electrolytic aluminum as raw materials, put the raw materials into the smelting crucible of gas atomization powder making equipment, first put the whole atomization system Vacuumize the inside to remove the air, then pass in the inert gas nitrogen or argon protection, heat to 1660-1700 ℃ and start to pass high-pressure nitrogen or argon into the nozzle for atomization, after atomization, it will be classified by air flow, and the powder ≤ 15 microns will be selected , The atomization process strictly controls the purity of raw materials to reach more than 99.9wt.%, and cleans the dust and stains outside. After the laser particle size test, the average particle size of the powder is 8.7 microns, and the oxygen content is 0.26%.

[0021] Choose WC powder with an average particle size of 11.2 microns, put it into a ball mill according to WC80wt.%, pre-alloyed powder 20wt.%...

Embodiment 2

[0023]According to Co58.45wt.%, Ni36.05wt.%, Al5.7wt.%, prepare electrolytic cobalt, electrolytic nickel and electrolytic aluminum as raw materials, put the raw materials into the melting crucible of the gas atomization powder making equipment, first put the whole atomization system Vacuumize the inside to remove the air, then pass in the inert gas nitrogen or argon protection, heat to 1660-1700 ℃ and start to pass high-pressure nitrogen or argon into the nozzle for atomization, after atomization, it will be classified by air flow, and the powder ≤ 15 microns will be selected , The atomization process strictly controls the purity of raw materials to reach more than 99.9wt.%, and cleans the dust and stains outside. After the laser particle size test, the average particle size of the powder is 7.9 microns, and the oxygen content is 0.46%.

[0024] Choose WC powder with an average particle size of 11.2 microns, put it into a ball mill according to WC80wt.%, pre-alloyed powder 20w...

Embodiment 3

[0026] According to Co81.11wt.%, Ni16.39wt.%, Al2.7wt.%, prepare electrolytic cobalt, electrolytic nickel and electrolytic aluminum as raw materials, put the raw materials into the smelting crucible of gas atomization powder making equipment, first put the whole atomization system Vacuumize the inside to remove the air, then pass in the inert gas nitrogen or argon protection, heat to 1660-1700 ℃ and start to pass high-pressure nitrogen or argon into the nozzle for atomization, after atomization, it will be classified by air flow, and the powder ≤ 15 microns will be selected , The atomization process strictly controls the purity of raw materials to reach more than 99.9wt.%, and cleans the dust and stains outside. After the laser particle size test, the average particle size of the powder is 8.3 microns, and the oxygen content is 0.34%.

[0027] Choose WC powder with an average particle size of 11.2 microns, put it into a ball mill according to WC80wt.%, pre-alloyed powder 20wt....

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Abstract

The invention provides a method for preparing high strength and hard alloy using pre-alloyed powder. Firstly, CoNiAl pre-alloyed powder is prepared through an atomization method, and then a final hardalloy product is obtained through the CoNiAl pre-alloyed powder and WC powder mixing, ball milling, spray drying granulation, pressing forming, sintering and heat treatment process. According to themethod for preparing the high strength and hard alloy using the pre-alloyed powder, the CoNiAl pre-alloyed powder is used as a bonding phase to prepare hard alloy, not only avoids the increase of oxygen content or Al2O3 impurities caused by direct use of Al powder or indirect use of Al powder as a raw material, but also makes distribution of Al more uniform, thus Ni3Al precipitated in a final bonding phase is evenly distributed, and the dispersion strengthening effect is good. The method for preparing the high strength and hard alloy using the pre-alloyed powder uniformly precipitates a Ni3Alstrengthening phase in a metal bonding phase of the hard alloy prepared by using the pre-alloyed powder, plays a strengthening role in the metal bonding phase, improves the hardness, bending strengthand fracture toughness of the hard alloy, as well as the wear resistance in the final use process, and has the advantages of good process controllability and stable product quality.

Description

technical field [0001] The invention relates to a method for preparing high-strength and tough hard alloys by using pre-alloy powder, and belongs to the field of hard alloys prepared by powder metallurgy. [0002] technical background [0003] WC cemented carbide is a composite material with excellent performance. Due to its high strength, high hardness, high wear resistance and high red hardness, it is widely used as cutting tools, mining tools and wear-resistant parts. Because Co has excellent adhesion to WC and its wetting angle to WC is close to 0°, most of the existing WC cemented carbides are composed of WC as the matrix, Co as the binder phase and other additive elements. However, due to the high price of Co, which is a strategic resource, the development of cemented carbide is limited to a certain extent. The study found that from a thermodynamic point of view, the metal compound Ni 3 Al has sufficient wettability at high temperatures, and its wetting angle is close...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F9/08B22F9/04B22F3/10C22F1/00
CPCB22F3/1007B22F3/1039B22F9/04B22F9/082B22F2009/043B22F2009/0848C22C1/058C22C29/067C22C29/08C22F1/00
Inventor 林涛李飞宏韩宇李继康邵慧萍何新波
Owner UNIV OF SCI & TECH BEIJING
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