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High-entropy alloy binding phase ultrafine tungsten carbide hard alloy and preparation method thereof

A high-entropy alloy and cemented carbide technology, applied in the field of cemented carbide, can solve the problems of losing ultrafine/nanocrystalline features, complex process, toxicity, etc., achieve good comprehensive mechanical properties, reduce Co consumption, and reduce raw material costs Effect

Active Publication Date: 2019-01-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of ultrafine / nanocrystalline cemented carbide can improve the comprehensive performance of cemented carbide, the process is complicated, and the ultrafine / nanocrystalline cemented carbide powder grows rapidly during the sintering process so that it loses its ultrafine / nanocrystalline characteristics. Therefore, it is necessary to add grain growth inhibitors
On the other hand, although some new binder phases have been developed, cobalt, which is magnetic, toxic and a strategic resource, is still the most widely used binder phase, which is also an important challenge for the preparation of new binder phases.

Method used

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  • High-entropy alloy binding phase ultrafine tungsten carbide hard alloy and preparation method thereof
  • High-entropy alloy binding phase ultrafine tungsten carbide hard alloy and preparation method thereof

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Experimental program
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Embodiment 1

[0029] A method for preparing high-entropy alloy binder phase ultrafine tungsten carbide cemented carbide, comprising the following steps:

[0030] 1) Weigh Al, Co, Cr, Cu, Fe and Ni powders with a purity greater than 99.9% and an average particle size of less than 45 μm in a molar ratio of 1:1:1:1:1:1, and mix them uniformly Put it into a cemented carbide ball mill jar, and fill it with cemented carbide grinding balls according to the ball-to-material ratio of 10:1, vacuumize the ball mill jar and fill it with high-purity argon; then dry mill at a speed of 300 rpm 40 hours, followed by 2 hours of wet milling (the wet milling medium is ethanol) to obtain high-entropy alloy powder; after the ball milling process is completed, the high-entropy alloy powder is put into a vacuum drying oven and dried at a temperature of 70°C for 48 hours, and Cross 300# sampling sieve, granulate;

[0031] 2) Put 15g of the high-entropy alloy powder of step 1) and 135g of WC powder with a purity g...

Embodiment 2

[0034] A method for preparing high-entropy alloy binder phase ultrafine tungsten carbide cemented carbide, comprising the following steps:

[0035] 1) Weigh Al, Co, Cr, Cu, Fe and Ni powders with a purity greater than 99.9% and an average particle size of less than 45 μm in a molar ratio of 1:1:1:1:1:1, and mix them uniformly Put it into a cemented carbide ball mill jar, and fill it with cemented carbide grinding balls according to the ball-to-material ratio of 10:1, vacuumize the ball mill jar and fill it with high-purity argon; then dry mill at a speed of 300 rpm 40 hours, followed by 2 hours of wet milling (the wet milling medium is ethanol) to obtain high-entropy alloy powder; after the ball milling process is completed, the high-entropy alloy powder is put into a vacuum drying oven and dried at a temperature of 70°C for 48 hours, and Pass 300# sampling sieve, granulate;

[0036] 2) Put 7.5g of the high-entropy alloy powder of step 1) and 142.5g of WC powder with a purity...

Embodiment 3

[0039] A method for preparing high-entropy alloy binder phase ultrafine tungsten carbide cemented carbide, comprising the following steps:

[0040] 1) Weigh Al, Co, Cr, Cu, Fe and Ni powders with a purity greater than 99.9% and an average particle size of less than 45 μm in a molar ratio of 0.5:1:1:1:1:1, and mix them uniformly Put it into a cemented carbide ball mill jar, and fill it with cemented carbide grinding balls according to the ball-to-material ratio of 10:1, vacuumize the ball mill jar and fill it with high-purity argon; then dry mill at a speed of 300 rpm 40 hours, followed by 2 hours of wet milling (the wet milling medium is ethanol) to obtain high-entropy alloy powder; after the ball milling process is completed, the high-entropy alloy powder is put into a vacuum drying oven and dried at a temperature of 70°C for 48 hours, and Cross 300# sampling sieve, granulate;

[0041] 2) Put 15g of the high-entropy alloy powder of step 1) and 135g of WC powder with a purity...

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Abstract

The invention belongs to the technical field of hard alloy, and discloses high-entropy alloy binding phase ultrafine tungsten carbide hard alloy and a preparation method thereof. According to the high-entropy alloy binding phase ultrafine tungsten carbide hard alloy, high-entropy alloy is used as a binding phase, and tungsten carbide is used as a hard phase; the high-entropy alloy is prepared fromthe components of five or more of Al, Co, Cr, Cu, Fe and Ni, and an atomic percentage of each element is 5-35%. The method comprises the steps that after high-entropy alloy powder and WC powder are mixed, spark plasma sintering forming is conducted to obtain the high-entropy alloy binding phase ultrafine tungsten carbide hard alloy. The tungsten carbide hard alloy is fine and small in crystal grain, and is good in comprehensive mechanical performance; adding a crystal growth inhibitor is not needed; consumption of the Co is significantly reduced, so that the raw material cost is reduced.

Description

technical field [0001] The invention relates to an ultrafine tungsten carbide hard alloy with a high-entropy alloy binder phase and a preparation method thereof, belonging to the technical field of hard alloys. Background technique [0002] Cemented carbide has high hardness, good high temperature strength and fracture toughness, and has been widely used in industry, such as metal cutting tools, drill bits, drafting molds, etc., so it is also known as "industrial teeth". Cemented carbide is prepared by a powder metallurgy process from a hard phase and a binder phase. The hard phase provides high hardness to the cemented carbide, and the binder phase provides toughness to it, and usually the fracture toughness decreases as the hardness increases. In order to improve the overall performance of cemented carbide and reduce costs to meet the needs of industrial development, a lot of research has been done on the preparation of ultrafine / nanocrystalline cemented carbide and the de...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/067C22C29/08
Inventor 刘允中罗文艳沈君剑
Owner SOUTH CHINA UNIV OF TECH
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