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A kind of preparation method of nano-toughened ultra-fine-grained WC-CO cemented carbide

A cemented carbide and ultra-fine grain technology, which is applied in the field of preparing strong and tough ultra-fine grain cemented carbide, can solve the problems of complex process of fine-grained cemented carbide, little practical production significance, and high process parameter requirements. Uniform microstructure, saving man-hours and energy consumption, good metallurgical integration

Active Publication Date: 2019-05-07
SHENYANG SHENGSHI WUHUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the powder is easy to grow during the sintering process of preparing ultra-fine cemented carbide, the process of obtaining fine-grained cemented carbide is complicated, there are many precautions, and the requirements for process parameters are high, which makes manufacturers have to greatly update equipment, thereby reducing costs. A sharp increase, generally of little significance for actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Grind the WC coarse powder with a particle size of less than 5mm into a fine powder with an average particle size of 0.2μm by JZDB-100 jet mill under the protection of high-purity argon with a working pressure of 0.75MPa and an oxygen content of ≤10ppm in the grinding chamber. material;

[0027] (2) The binder phase Co powder is prepared by JTSWH-50 high-pressure water atomization production line, under the protection of argon gas, the high-pressure water pressure is 80MPa, and the spherical fine powder with an average particle size of 0.2μm is prepared;

[0028] (3) Vacuum arc melting ingot + fast-in-situ packaging plasma arc method was used to prepare Ce-V nano-metal mixed powder with an average grain size of 50nm;

[0029] (4) In an argon protective atmosphere, use HDQH-1 pulse type high-speed airflow mixer to mix the WC hard phase and Co binder phase fine powder prepared in (1) and (2) by WC 94 co 6.0 (wt%) The Ce-V nano-metal mixed additive that accounts for 6....

Embodiment 2

[0038] (1) Grind the WC coarse powder with a particle size of less than 5mm into a fine powder with an average particle size of 0.2μm by JZDB-100 jet mill under the protection of high-purity argon with a working pressure of 0.75MPa and an oxygen content of ≤10ppm in the grinding chamber. material;

[0039] (2) The binder phase Co powder is prepared by JTSWH-50 high-pressure water atomization production line, under the protection of argon gas, the high-pressure water pressure is 80MPa, and the spherical fine powder with an average particle size of 0.2μm is prepared;

[0040] (3) Y-Ce-Co-V nano-metal mixed powder with an average grain size of 50nm was prepared by vacuum arc melting ingot + fast-in-situ packaging plasma arc method;

[0041] (4) In an argon protective atmosphere, use HDQH-1 pulse type high-speed airflow mixer to mix the WC hard phase and Co binder phase fine powder prepared in (1) and (2) by WC 94 co 6.0 (wt%) The Y-Ce-Al-Co-V nano-metal mixed additive that acco...

Embodiment 3

[0050] (1) Grind the WC coarse powder with a particle size of less than 5mm into a fine powder with an average particle size of 0.2μm by JZDB-100 jet mill under the protection of high-purity argon with a working pressure of 0.75MPa and an oxygen content of ≤10ppm in the grinding chamber. material;

[0051] (2) The binder phase Co powder is prepared by JTSWH-50 high-pressure water atomization production line, under the protection of argon gas, the high-pressure water pressure is 80MPa, and the spherical fine powder with an average particle size of 0.2μm is prepared;

[0052] (3) Sm-Cr nano-metal mixed powder with an average grain size of 50nm was prepared by vacuum arc melting ingot + fast-in-situ packaging plasma arc method;

[0053] (4) In an argon protective atmosphere, use HDQH-1 pulse type high-speed airflow mixer to mix the WC hard phase and Co binder phase fine powder prepared in (1) and (2) by WC 92 co 8.0 (wt%) The ratio is the same as the Sm-Cr nano-metal mixed addi...

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Abstract

The invention discloses a preparing method for nanometer toughening ultra-fine grain WC-Co cemented carbide. The preparing method for the nanometer toughening ultra-fine grain WC-Co cemented carbide comprises the following steps of that 0.1-0.5 micron ultra-fine powder of WC hard phase and Co binder phase is prepared by adopting an airflow crushing classification method and a high-pressure water atomization method correspondingly, and the ultra-fine grain cemented carbide is prepared through material matching and nano-metal mixed additives adding, airflow mixed powder sieving, ball milling waxing and drying sieving, mold pressing and cold isostatic pressing molding and pressure sintering and heat treating, wherein the nano-metal mixed additives are prepared by adopting vacuum electric arc smelting ingot casting plus rapid-in-situ packaging plasma arc process discharging method. The nano-metal mixed additives play the role of refining the cemented carbide granules, improving the material wettability, reducing the porosity and enhancing the local grain boundary strength, so that macro performances such as hardness, flexural strength and fracture toughness of the alloy are improved greatly. The preparing method for the nanometer toughening ultra-fine grain WC-Co cemented carbide has the advantages of being high in production efficiency, low in production cost, high in product quality and purity, and a great deal of man-hour and energy consumption are saved.

Description

technical field [0001] The invention relates to the technical field of cemented carbide preparation, in particular to a method for preparing a strong and tough WC-Co hard alloy by directly adding alloy nano-additives composed of various metals to form a grain boundary phase, especially for preparing tough and tough ultrafine-grained hard alloys. alloy method. Background technique [0002] Cemented carbide has the advantages of high hardness, high strength, high wear resistance, strong corrosion resistance and low thermal expansion coefficient. At present, it has been widely used in cutting tools, drilling teeth and ore crushing machinery. Mining and other indispensable important materials. However, cemented carbide is a brittle material, and the bottleneck of its poor performance is the contradiction between hardness and strength, that is, between wear resistance and toughness: ordinary cemented carbide has high hardness and low strength, while high strength has low hardnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/051C22C29/08
Inventor 李嘉王炳智关锡宠张俊飞张强
Owner SHENYANG SHENGSHI WUHUAN TECH CO LTD
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