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Preparation method of nano zirconium dioxide reinforced NbMoTaW refractory high-entropy alloy

A nano-zirconium dioxide and high-entropy alloy technology, which is applied in the field of refractory high-entropy alloy preparation, can solve the problems of low process efficiency, complex process flow, and low powder yield, and achieve simple process flow, low cost, and ball milling short time effect

Active Publication Date: 2022-07-22
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The combination of mechanical alloying and spark plasma sintering technology is the most commonly used preparation process for the preparation of refractory high-entropy alloys by powder metallurgy. However, there are problems such as long mechanical alloying process cycle, low powder yield and complicated process. Process efficiency is not high

Method used

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  • Preparation method of nano zirconium dioxide reinforced NbMoTaW refractory high-entropy alloy
  • Preparation method of nano zirconium dioxide reinforced NbMoTaW refractory high-entropy alloy
  • Preparation method of nano zirconium dioxide reinforced NbMoTaW refractory high-entropy alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Ball milling mixing: 99.5 g of metal powder and nano ZrO mixed with equal molar ratio of Nb powder, Mo powder, Ta powder and W powder are used 2 0.5g of particles was used as a raw material, without adding a ball milling medium, ball milling and mixing were carried out in a planetary ball mill. Among them, the particle size of W powder and Ta powder are both less than 0.035mm, the particle size of Mo powder and Nb are less than 0.045mm, ZrO powder 2 The particle size is less than 30nm; the purity of Nb powder, Mo powder, Ta powder and W powder are all greater than 99.9%, ZrO powder 2 The purity is greater than 99.99%. The material of the ball mill jar and the grinding balls are WC cemented carbide. The inside of the ball mill jar is evacuated and high-purity argon gas is introduced as a protective atmosphere. In the process of ball milling, the ball-to-material ratio is 10:1, the ball milling speed is 300r / min, the operation mode is forward and reverse alternate o...

Embodiment 2

[0032] (1) Ball milling mixing: 99.5 g of metal powder and nano ZrO mixed with equal molar ratio of Nb powder, Mo powder, Ta powder and W powder are used 2 0.5g of particles was used as a raw material, without adding a ball milling medium, ball milling and mixing were carried out in a planetary ball mill. The particle sizes of W powder and Ta powder are both less than 0.035mm, the particle size of Mo powder and Nb powder are less than 0.045mm, ZrO powder 2 The particle size is less than 30nm; the purity of Nb powder, Mo powder, Ta powder and W powder are all greater than 99.9%, ZrO powder 2 The purity is greater than 99.99%. The material of the ball mill jar and the grinding balls are WC cemented carbide. The inside of the ball mill jar is evacuated and high-purity argon gas is introduced as a protective atmosphere. In the process of ball milling, the ball-to-material ratio is 12:1, the ball milling speed is 350r / min, the operation mode is forward and reverse alternate opera...

Embodiment 3

[0035] (1) Ball milling mixing: 99g of metal powder and nano ZrO mixed with equal molar ratio of Nb powder, Mo powder, Ta powder and W powder are used 2 1 g of particles was used as a raw material, and ball milling was carried out in a planetary ball mill without adding a ball milling medium. The particle sizes of W powder and Ta powder are both less than 0.035mm, the particle size of Mo powder and Nb powder are less than 0.045mm, ZrO powder 2 The particle size of the powder is less than 30nm; the purity of Nb powder, Mo powder, Ta powder and W powder are all greater than 99.9%, ZrO powder 2 The purity is greater than 99.99%. The material of the ball mill jar and the grinding balls are WC cemented carbide. The inside of the ball mill jar is evacuated and high-purity argon gas is introduced as a protective atmosphere. In the process of ball milling, the ball-to-material ratio is 15:1, the ball milling speed is 400r / min, the operation mode is forward and reverse alternate oper...

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Abstract

The invention relates to a preparation method of a nano zirconium dioxide reinforced NbMoTaW refractory high-entropy alloy, which comprises the following steps of: ball-milling and mixing metal powder formed by mixing Nb powder, Mo powder, Ta powder and W powder with equal molar ratio or nearly equal molar ratio and nano ZrO2 particles in a high-energy ball mill to obtain mixed powder; and the obtained mixed powder is placed in a graphite mold, pressure sintering is conducted in a high vacuum state through a spark plasma sintering method, and the high-strength ZrO2 reinforced NbMoTaW refractory high-entropy alloy is obtained. According to the method, the technological process is simple, the cost is low, the efficiency is high, the ZrO2 enhanced NbMoTaW refractory high-entropy alloy which is uniform in structure, fine in crystal grain and high in strength and plasticity and has nano ZrO2 dispersed distribution is obtained, compared with the prior art, the room-temperature plasticity of the NbMoTaW refractory high-entropy alloy is greatly improved, and the alloy has the advantages of being high in strength and plasticity. The defects of composition segregation, long mechanical alloying test period and low powder yield caused by an existing casting method preparation process are effectively overcome.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory high-entropy alloys, in particular to a preparation method of nano-zirconia reinforced NbMoTaW refractory high-entropy alloys. Background technique [0002] Metal alloys have excellent mechanical properties at high temperatures and are widely used in aerospace, nuclear reactors and other fields. With the rapid development of science and technology, more stringent requirements are put forward for the high temperature resistance and high temperature structural stability of metal alloys. At present, the most widely used superalloys are nickel-based alloys, which have an excellent combination of properties at a temperature of 1000 °C, but are limited by factors such as melting point and cannot be used at higher operating temperatures. [0003] Recently, a new design concept has become popular, which combines many main elements to form so-called high-entropy alloys. According to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/00B22F3/105
CPCC22C1/04C22C30/00B22F3/105B22F2003/1051
Inventor 徐流杰宗乐魏世忠朱晨辉刘美君罗春阳周玉成王长记王喜然潘昆明李秀青李洲
Owner HENAN UNIV OF SCI & TECH
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