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Composite containing high-entropy alloy/ceramic continuous-gradient composite coating and preparation method and device thereof

A high-entropy alloy and composite coating technology, which is applied in metal material coating process, coating, molten spraying, etc., can solve the problem of high preparation cost of high-entropy alloy powder or wire, insufficient bonding strength between coating and substrate, and difficult Prepare gradient composite coatings and other issues to achieve the effect of ingenious design concept, simple structure and easy operation

Active Publication Date: 2018-05-29
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have certain limitations, such as: complex preparation process, high equipment requirements, large power consumption, and difficulty in preparing gradient composite coatings
Among them, the cladding width of a single pass of laser cladding is too small, and achieving a good "lap joint" between cladding passes is the key point in the preparation of large-area cladding layers. At the same time, local temperature rises are prone to generate thermal stress, etc. In some places, it is difficult to prepare thick coatings by magnetron sputtering, the bonding strength between thermal sprayed coatings and the substrate is not enough, and the raw material high-entropy alloy powder or wire preparation costs are high

Method used

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  • Composite containing high-entropy alloy/ceramic continuous-gradient composite coating and preparation method and device thereof
  • Composite containing high-entropy alloy/ceramic continuous-gradient composite coating and preparation method and device thereof
  • Composite containing high-entropy alloy/ceramic continuous-gradient composite coating and preparation method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A composite material containing a high-entropy alloy / ceramic continuous gradient composite coating, including a substrate and a high-entropy alloy / ceramic continuous gradient composite coating, and the high-entropy alloy / ceramic continuous gradient composite coating is coated on the substrate in one step by aluminothermic reaction Surface, its preparation method, comprises the following steps:

[0042] (1) Prepare the experimental device: prepare as figure 1 and figure 2 The shown device includes a thermite reactor 4, a plug 1, a catheter 5 and an atomizer 6; the inner diameter of the thermite reactor 4 is 12mm, and a protective cover 2 is provided on the upper part, and the plug 1 is inserted into the catheter 5, the inner diameter of the lower end of the catheter 5 (i.e., the diameter of the liquid flow) is 5mm, and the preheating device 3 is set around the thermite reactor 4, and the thermite reactor 4 is preheated to 650°C, and the to-be-coated The coating substr...

Embodiment 2

[0055] A composite material containing a high-entropy alloy / ceramic continuous gradient composite coating, including a substrate and a high-entropy alloy / ceramic continuous gradient composite coating, and the high-entropy alloy / ceramic continuous gradient composite coating is coated on the substrate in one step by aluminothermic reaction Surface, its preparation method, comprises the following steps:

[0056] (1) Prepare the experimental device: prepare as figure 1 and figure 2 The shown device includes a thermite reactor 4, a plug 1, a catheter 5 and an atomizer 6; the inner diameter of the thermite reactor 4 is 12mm, and a protective cover 2 is provided on the upper part, and the plug 1 is inserted into the catheter 5, the inner diameter of the lower end of the catheter 5 (i.e., the diameter of the liquid flow) is 5mm, and the preheating device 3 is set around the thermite reactor 4, and the thermite reactor 4 is preheated to 650°C, and the to-be-coated The coating substr...

Embodiment 3

[0070] A composite material containing a high-entropy alloy / ceramic continuous gradient composite coating, including a substrate and a high-entropy alloy / ceramic continuous gradient composite coating, and the high-entropy alloy / ceramic continuous gradient composite coating is coated on the substrate in one step by aluminothermic reaction Surface, its preparation method compares difference with embodiment 1 in that the Fe in the raw material 2 o 3 Replace it with simple iron, and change its dosage accordingly. In this embodiment, a composite material containing a high-entropy alloy / ceramic continuous gradient composite coating 8 (thickness 8 mm) is finally obtained.

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Abstract

A composite containing high-entropy alloy / ceramic continuous-gradient composite coating comprises a matrix and the high-entropy alloy / ceramic continuous-gradient composite coating. The high-entropy alloy / ceramic continuous-gradient composite coating is 5-10 mm thick and contains high-entropy alloy and aluminum oxide, and the volume fraction of the aluminum oxide in the high-entropy alloy / ceramic continuous-gradient composite coating is in continuous gradient change from the bottom layer to the top layer. The invention further provides a preparation method and device of the composite. By the adoption of the composite containing the high-entropy alloy / ceramic continuous-gradient composite coating and the preparation method and device of the high-entropy alloy / ceramic continuous-gradient composite coating, a conventional preparation method of the high-entropy alloy coating is broken through, the composite containing the high-entropy alloy coating is prepared through an aluminum thermal reaction, the step of compounding high-entropy alloy powder first of all during conventional coating preparation is omitted, and the composite containing the high-entropy alloy coating can be prepared through simple steps; and the whole technological process is ingenious in design and concept, the energy consumption in the preparation process is low, the steps are simple, and operation is easy.

Description

technical field [0001] The invention belongs to the field of alloy materials, and in particular relates to a composite material containing an alloy / ceramic composite coating and a preparation method and device thereof. Background technique [0002] Due to its high entropy effect, severe lattice distortion effect, diffusion hysteresis effect and "cocktail" effect, high entropy alloys have excellent mechanical properties and functional properties, especially the high entropy alloy composite materials developed in recent years in corrosion resistance , wear resistance, high temperature resistance and other properties are particularly prominent, so high-entropy alloys and their composite materials are increasingly becoming candidates for the preparation of excellent alloy coatings. [0003] With the increasing requirements for corrosion and wear resistance of large-scale component materials such as large molds, heavy-duty dump truck bodies, ship decks, and pressure vessels, thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/123
CPCC23C4/06C23C4/123
Inventor 陈刚沈书成朱立华涂川俊
Owner HUNAN UNIV
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