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Preparation method of WC-based hard alloy with high-entropy powder as binder

A high-entropy alloy and cemented carbide technology, which is applied in the field of cermet materials, can solve the problems of failing to give full play to the characteristics of high-entropy alloys, and achieve good high-temperature oxidation resistance and wear resistance, high hardness and good mechanical properties. Effect

Inactive Publication Date: 2019-02-22
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method fails to give full play to the characteristics of high-entropy alloys because the high-entropy alloy binder is not fully alloyed before mixing and sintering

Method used

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  • Preparation method of WC-based hard alloy with high-entropy powder as binder
  • Preparation method of WC-based hard alloy with high-entropy powder as binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take five elements such as Fe, Co, Cr, Ni, Al, etc., according to an equimolar ratio of 1:1:1:1:1, weigh a total of 80g, put it into a ball mill jar, add 2ml of ball mill control agent n-heptane Alkanes reagent, the ball-to-material ratio is 15:1, the ball milling speed is 250rpm, and the high-energy ball milling is carried out for 60h to obtain mechanically alloyed high-entropy alloy powder. Weigh 10% high-entropy alloy powder and 90% WC powder according to the mass ratio and put it into a ball mill jar, add 50ml of alcohol solution, put the ball mill jar into a planetary ball mill for low-energy ball milling, the ball mill speed is 150rpm, and the ball-to-material ratio is 8:1. Then unload and vacuum dry for storage for later use. Vacuum sintering is adopted. Weigh 80g of powder, add 1.2% paraffin wax as a molding agent, and press it into a blank with a 6.3t press, then degrease at 500°C, sinter at 1400°C under vacuum after degreasing, and measure its properties. Th...

Embodiment 2

[0032] Take five elements such as Fe, Co, Cr, Ni, Al, etc., according to an equimolar ratio of 1:1:1:1:1, weigh a total of 80g, put it into a ball mill jar, add 2ml of ball mill control agent n-heptane Alkanes reagent, the ball-to-material ratio is 15:1, the ball milling speed is 250rpm, and the high-energy ball milling is carried out for 60h to obtain mechanically alloyed high-entropy alloy powder. Weigh 10% high-entropy alloy powder and 90% WC powder according to the mass ratio and put it into a ball mill jar, add 50ml of alcohol solution, put the ball mill jar into a planetary ball mill for low-energy ball milling, the ball mill speed is 150rpm, and the ball-to-material ratio is 8:1. Then unload and vacuum dry for storage for later use. Vacuum hot pressing sintering method is adopted. Weigh 80g of powder, put it into a graphite mould, and sinter under vacuum at 15Mpa at 1400°C to obtain a sample, and measure its properties, and its hardness is 1850HV.

Embodiment 3

[0034] Take five elements such as Fe, Co, Cr, Ni, Al, etc., according to an equimolar ratio of 1:1:1:1:1, weigh a total of 80g, put it into a ball mill jar, add 2ml of ball mill control agent n-heptane Alkanes reagent, the ball-to-material ratio is 15:1, the ball milling speed is 250rpm, and the high-energy ball milling is carried out for 60h to obtain mechanically alloyed high-entropy alloy powder. Weigh 10% high-entropy alloy powder and 90% WC powder according to the mass ratio and put it into a ball mill jar, add 50ml of alcohol solution, put the ball mill jar into a planetary ball mill for low-energy ball milling, the ball mill speed is 150rpm, and the ball-to-material ratio is 8:1. Then unload and vacuum dry for storage for later use. Using spark plasma sintering. Weigh 80g of powder, put it into a graphite mold, and sinter at 1400°C under vacuum with a pressure of 40Mpa to obtain a sample, and measure its properties, and its hardness is 1900HV.

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Abstract

The invention provides a preparation method of WC-based hard alloy with high-entropy powder as a binder. The binder is the high-entropy powder, and comprises iron, cobalt, chromium, nickel, aluminum,vanadium, titanium, copper, zirconium, manganese and the like, and is not added with other elements such as carbon, boron and silicon and metallic compounds. The hard alloy is prepared from the following raw material components in percentage by weight: 6%-30% of high-entropy powder as the binder and 70%-94% of WC powder. The preparation method of the hard alloy comprises the steps: (1) preparing the high-entropy powder as the binder; (2) mixing; and (3) performing sinter molding. The WC-based hard alloy is prepared by adopting three different sintering methods, and the hard alloy shows a highmechanical property.

Description

technical field [0001] The invention relates to the field of cermet materials, in particular to a preparation method of WC-based hard alloy using high-entropy alloy powder as a binder. Background technique: [0002] As a kind of cermet material, cemented carbide is a high hardness and high wear-resistant material prepared by powder metallurgy method based on refractory metal hard compound and metal as binder. It not only has the toughness of metal but also has the high strength of ceramics. At the same time, cemented carbide shows good wear resistance, making it widely used in manufacturing and processing industries. The main applications are cutting processing, impact tools, wear resistance corrosion parts, die-casting molds, etc. [0003] At present, with the further in-depth research of cermets by researchers, there are not only carbide bases, but also boride and nitride hard phases, but carbides are still the most widely used, and carbide hard phases are mainly Mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/067C22C29/08
Inventor 戴品强刘晓强郭轲科洪春福常发田君王卫国
Owner FUJIAN UNIV OF TECH
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