Ultrafine tungsten carbide hard alloy with high-entropy alloy as binding phase and preparation method thereof

A technology of high-entropy alloys and hard alloys, applied in the field of composite materials, can solve problems such as limited effects and achieve excellent friction and wear properties

Inactive Publication Date: 2020-06-16
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The high-entropy alloy binder and its preparation method used in the above studies have limited effects on improving the performance of WC cemented carbide, and mainly improve the mechanical properties such as hardness and toughness of WC cemented carbide, and the improvement is limited.

Method used

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  • Ultrafine tungsten carbide hard alloy with high-entropy alloy as binding phase and preparation method thereof
  • Ultrafine tungsten carbide hard alloy with high-entropy alloy as binding phase and preparation method thereof
  • Ultrafine tungsten carbide hard alloy with high-entropy alloy as binding phase and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing an ultrafine tungsten carbide cemented carbide with a high-entropy alloy as a binder phase, comprising the following steps:

[0027] S1. Preparation of nano five-component high-entropy alloy powder: in a glove box filled with argon, the molar ratios of Co, Cr, Ni, Cu, and Fe components range from 1 to 1.5 and mix them into a WC cemented carbide ball mill tank Among them, the mass ratio of ball and material is 10:1~20:1, the speed is 300~600r / min, the ball milling time is 30~60h, every turn 10h, stop for 30min to dissipate heat, stop every 10h to remove the sticky balls and the inner wall of the tank Scrape off the raw materials and mix them evenly, then add 0.2ml / 10g of anhydrous ethanol dispersant to the mixed powder and continue ball milling to obtain a nanometer CoCrNiCuFe powder with a fineness of 150nm or less;

[0028] S2. Preparation of nano-WC powder: The WC powder is ball-milled, the mass ratio of the b...

Embodiment 1

[0042] A method for preparing ultrafine tungsten carbide cemented carbide with high-entropy alloy as binder phase, its raw materials and proportioning ratio are shown in the following table,

[0043] Table 1 Raw materials and mass ratios for preparing CoCrNiCuFe

[0044]

[0045] Table 2 prepares the raw material and its proportioning of 40g tungsten carbide cemented carbide

[0046]

[0047] The preparation method is as follows:

[0048] S1. In a glove box filled with argon, weigh 2.039g Co, 1.799g Cr, 2.031g Ni, 2.199g Cu and 1.932g Fe according to Table 1 and mix them into a WC cemented carbide ball mill jar. The ratio is 10:1, the rotating speed is 300r / min, the ball milling time is 60h, stop for 30min every 10h to dissipate heat, stop every 10h to scrape off the raw materials sticking to the grinding ball and the inner wall of the tank, and then add 0.2ml / 10g mixed powder The anhydrous ethanol dispersant of the raw material is continuously ball-milled to obtain a ...

Embodiment 2

[0056] A method for preparing ultrafine tungsten carbide cemented carbide with high-entropy alloy as binder phase, its raw materials and proportioning ratio are shown in the following table,

[0057] Table 4 prepares raw materials and mass ratios of CoCrNiCuFe

[0058]

[0059] Table 5 prepares the raw material and its proportioning of 40g tungsten carbide cemented carbide

[0060]

[0061] The preparation method is as follows:

[0062] S1. In a glove box filled with argon, weigh 2.039g Co, 1.799g Cr, 2.031g Ni, 2.199g Cu and 1.932g Fe according to Table 4 and mix them into a WC cemented carbide ball mill jar. The ratio is 10:1, the rotating speed is 400r / min, the ball milling time is 55h, every turn 10h, stop for 30min to dissipate heat, stop every 10h to scrape off the raw materials sticking to the grinding ball and the inner wall of the tank, and then add 0.2ml / 10g mixed powder The anhydrous ethanol dispersant of the raw material is continuously ball-milled to obtai...

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Abstract

The invention belongs to the technical field of composite materials, and relates to an ultrafine tungsten carbide hard alloy with a high-entropy alloy as a binding phase and a preparation method thereof. The high-entropy alloy is a Co, Cr, Ni, Cu and Fe five-component high-entropy alloy, the mass percentage of the high-entropy alloy accounts for 5-30wt% of the total system, and the balance is WC.The preparation method comprises the following steps that firstly, nano five-component high-entropy alloy powder is prepared, and WC powder is refined; secondly, the nano five-component high-entropy alloy powder and the nano WC are mixed in a ball mill according to different mass ratios; the uniformly mixed powder is pre-pressed; the pre-pressed part is subjected to annealing treatment; finally, vacuum hot-pressing sintering is carried out, the sintering pressure is 40-50 MPa, and the sintering temperature is 1200-1400 DEG C; then cooling and pressure relief are carried out, and the ultrafinetungsten carbide hard alloy is prepared; and after sintering, the hard alloy sintered body is subjected to annealing treatment. According to the ultrafine tungsten carbide hard alloy with the high-entropy alloy as the binding phase and the preparation method thereof, the production cost is reduced, and the performance of the tungsten carbide hard alloy is improved.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to an ultrafine tungsten carbide hard alloy with a high-entropy alloy as a binding phase and a preparation method thereof. Background technique [0002] Tungsten carbide has excellent heat resistance, corrosion resistance, high hardness and wear resistance, and is widely used in materials such as cutting tools, molds and rolls. Usually, WC is used as the main hard phase, Co is used as the binder, and it is synthesized by powder metallurgy. However, metal cobalt is expensive and toxic. Therefore, the cemented carbide industry needs to find substitutes for Co binders to reduce production costs and promote sustainable development of the industry. In recent years, high-entropy alloy-bonded tungsten carbide cemented carbide has been widely studied due to its excellent performance. [0003] Dong Dingqian et al. used 3-35wt.% CoNiCuFeCr high-entropy alloy as the strengtheni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/14
CPCB22F3/14B22F2998/10C22C1/051C22C29/067C22C29/08B22F2009/043B22F2003/248
Inventor 邹芹李艳国王明智赵玉成熊建超邹娟
Owner YANSHAN UNIV
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