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A kind of MO nanoparticle reinforced CoCRNI medium entropy alloy composite material and preparation method thereof

A nanoparticle and composite material technology, applied in the field of composite material preparation, can solve problems such as difficult to avoid oxidation or contamination of powder, and achieve good fine-grain strengthening effect, excellent mechanical properties, tensile strength and hardness.

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

AI Technical Summary

Problems solved by technology

However, at present, the introduction of reinforcement phase particles is mainly through the traditional ball milling or mechanical alloying process. This long-term mixing process is difficult to avoid the disadvantages of oxidation or powder contamination, and will cause redundant pores in the alloy powder.

Method used

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  • A kind of MO nanoparticle reinforced CoCRNI medium entropy alloy composite material and preparation method thereof
  • A kind of MO nanoparticle reinforced CoCRNI medium entropy alloy composite material and preparation method thereof
  • A kind of MO nanoparticle reinforced CoCRNI medium entropy alloy composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The present invention provides a kind of preparation method of CoCrNi medium entropy alloy composite material reinforced by Mo nanoparticles, comprising the following steps:

[0037] (1) Weigh 1.19g of ammonium tetramolybdate powder and dissolve it in 40ml of deionized water, heat and stir at 60°C until completely dissolved to obtain ammonium tetramolybdate solution;

[0038] (2) Add 63.81g of gas-atomized CoCrNi medium-entropy alloy powder into the ammonium tetramolybdate solution, and evaporate the water in the beaker while stirring at an oil bath temperature of 120°C, until the powder in the beaker is completely stirred with a glass rod until it moves, and then put it into a vacuum drying oven to dry at 60°C for 24 hours to obtain a mixed powder;

[0039] (3) Pass the mixed powder through a 80-mesh mesh sieve, and spread the sieved powder into a graphite crucible, and calcinate the powder in an argon atmosphere at a temperature of 500°C for 30 minutes to obtain a cal...

Embodiment 2

[0043] The present invention provides a kind of preparation method of CoCrNi medium entropy alloy composite material reinforced by Mo nanoparticles, comprising the following steps:

[0044] (1) Weigh 3.57g of ammonium tetramolybdate powder and dissolve it in 40ml of deionized water, heat and stir at 60°C until completely dissolved to obtain ammonium tetramolybdate solution;

[0045](2) Add 61.43g of gas-atomized CoCrNi medium-entropy alloy powder into the ammonium tetramolybdate solution, and evaporate the water in the beaker while stirring at an oil bath temperature of 120°C, until the powder in the beaker is completely stirred with a glass rod until it moves, and then put it into a vacuum drying oven to dry at 60°C for 24 hours to obtain a mixed powder;

[0046] (3) Pass the mixed powder through a 80-mesh mesh sieve, and spread the sieved powder into a graphite crucible, and calcinate the powder in an argon atmosphere at a temperature of 500°C for 30 minutes to obtain a calc...

Embodiment 3

[0050] The present invention provides a kind of preparation method of CoCrNi medium entropy alloy composite material reinforced by Mo nanoparticles, comprising the following steps:

[0051] (1) Weigh 5.97g of ammonium tetramolybdate powder and dissolve it in 40ml of deionized water, heat and stir at 60°C until completely dissolved to obtain ammonium tetramolybdate solution;

[0052] (2) Add 59.03g of gas-atomized CoCrNi medium-entropy alloy powder into the ammonium tetramolybdate solution, and evaporate the water in the beaker while stirring at an oil bath temperature of 120°C, until the powder in the beaker is completely stirred with a glass rod until it moves, and then put it into a vacuum drying oven to dry at 60°C for 24 hours to obtain a mixed powder;

[0053] (3) Pass the mixed powder through a 80-mesh mesh sieve, and spread the sieved powder into a graphite crucible, and calcinate the powder in an argon atmosphere at a temperature of 500°C for 30 minutes to obtain a cal...

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Abstract

The invention belongs to the technical field of composite material preparation, and provides a Mo nanoparticle-reinforced CoCrNi medium-entropy alloy composite material, and a preparation method thereof. Composite powder of the composite material comprises a substrate, i.e, CoCrNi medium-entropy alloy powder, and a coating layer, i.e., Mo nanoparticles. The composite powder comprises the followingcomponents according to weight percentages: 95-99wt% of CoCrNi medium-entropy alloy, and 1-5wt% of the Mo nanoparticles. The Mo nanoparticle-reinforced CoCrNi medium-entropy alloy composite materialprovided by the invention has advantages of relatively high density, excellent mechanical properties, remarkably higher tension strength and rigidity, and good fine crystal strengthening effects, maintains high tenacity, and fully exerts the performance advantages of nanoparticle-reinforced composite materials. The preparation method provided by the invention is simple in technique, and achieves auniform distribution of the Mo nanoparticles in the composite powder prepared with the coating method; and the powder obtained through calcination and reduction after coating is not oxidized or polluted, so that the method is very advantageous when compared with the traditional ball-milling and mechanical alloying methods.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a Mo nanoparticle-reinforced CoCrNi medium-entropy alloy composite material and a preparation method thereof. Background technique [0002] High-entropy alloys and medium-entropy alloys are new metal materials designed in recent years. Compared with traditional alloy systems, their unique composition and phase structure make alloys of different systems have different excellent properties. Such as high strength, hardness, good corrosion resistance, oxidation resistance and radiation resistance, etc. Compared with high-entropy alloys, medium-entropy alloys have better plasticity and fracture toughness. A large number of studies have shown that high-entropy alloys and medium-entropy alloys have potential applications in cemented carbides, superalloys, magnetic materials, heat-resistant and wear-resistant coatings, and mold linings. However, although FCC single...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/04B22F9/22
CPCB22F9/22C22C1/04C22C30/00
Inventor 杨海林汪建英
Owner CENT SOUTH UNIV
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