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A kind of preparation method of max phase base coating

A coating and substrate technology, applied in the field of preparation of MAX phase-based coatings, can solve the problems of low content of MAX phase in the coating and affect the performance of the coating, so as to improve the performance of the coating, improve the corrosion resistance and corrosion resistance. excellent effect

Active Publication Date: 2022-03-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, direct spraying of Cr by plasma spraying or supersonic flame spraying 2 In the AlC-MAX equal MAX phase powder process, the MAX phase with a special ternary layered structure is easily decomposed to form Cr 2 Al, Cr and other impurity phases, although part of the impurity phases can be recrystallized to form MAX phases by heat treatment, the content of MAX phases in the coating is still low, which affects the performance of the coating

Method used

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  • A kind of preparation method of max phase base coating
  • A kind of preparation method of max phase base coating
  • A kind of preparation method of max phase base coating

Examples

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preparation example Construction

[0033] A preparation method of MAX phase-based coating, comprising the following steps:

[0034] (1) Mix metal M, Al and C powders by ball milling, dry for use; the metal M is Cr, Nb or Ti;

[0035] (2) Sinter the dried powder to obtain M 2 AlC-MAX phase material;

[0036] (3) will M 2 AlC-MAX phase material is pulverized, made into powder by ball milling, and screened;

[0037] (4) Filter the obtained M 2 The mixed powder obtained by mixing AlC-MAX phase powder with Al powder or the M obtained by screening 2 AlC-MAX phase powder, poured into a metal tube or alloy tube with a melting point not higher than 1100 ° C, made into a metal or alloy coated M 2 AlC-MAX phase powder wire;

[0038] (5) The prepared wire is sprayed onto the surface of the substrate by flame spraying; the M in the wire 2 AlC-MAX phase, Al powder and metal or alloy are sprayed onto the substrate surface.

[0039] In this solution, during the spraying process, the molten metal or alloy entrained MAX ...

Embodiment 1

[0052] (1) According to the powder molar ratio Cr: Al: C = 2: 1.1: 1, the elemental powder is mixed and ball-milled, put into the mold, and the furnace temperature is raised to 1400°C at a heating rate of 10°C / min under a vacuum atmosphere. And keep it warm for 3 hours, and keep applying 50MPa pressure during the keep warm process.

[0053] (2) Take the Cr prepared in step (1) 2 AlC-MAX phase, crushed and made into powder by ball milling and sieved to obtain Cr with a particle size of 200 mesh 2 AlC-MAX phase powder particles. figure 1 for the obtained Cr 2 SEM images of AlC-MAX phase powder particles.

[0054] (3) Take the Cr with a particle size of 200 mesh in step (2) 2 AlC-MAX phase powder is poured into a 6063 aluminum alloy tube with a wall thickness of 0.5mm and an outer diameter of 3mm, and the two ends are sealed with aluminum alloy wire to obtain an aluminum alloy coated Cr tube. 2 AlC-MAX phase powder wire, the wire is named as Cr 2 AlC / Al.

[0055] (4) First...

Embodiment 2

[0058] The difference from Example 1 is that in step (3), Cr 2 AlC-MAX phase powder is mixed with Al powder, and then the mixed powder is poured into the wall aluminum alloy tube, Cr 2 The mixed volume ratio of AlC-MAX phase powder and Al powder is 2:1; the wire obtained in this example is named as Cr 2 AlC / 2Al.

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Abstract

The invention provides a method for preparing a MAX phase-based coating, which includes: (1) mixing metal M, Al and C powders by ball milling, drying them for use; (2) sintering the dried powders to obtain M 2 AlC‑MAX phase material; (3) M 2 AlC-MAX phase material is crushed, made into powder by ball milling, and screened; (4) Mixed powder obtained by mixing the screened powder with Al powder or pouring the screened powder into a metal with a melting point not higher than 1100 °C Tubes or alloy tubes, made of metal or alloy clad M 2 A wire rod of AlC-MAX phase powder; (5) spraying the prepared wire rod onto the surface of the substrate by flame spraying. The method of the invention has a simple process, can control the particle size and distribution density of the MAX phase, and the prepared protective coating does not contain impurity phases, has a compact structure and is closely combined with the matrix.

Description

technical field [0001] The invention belongs to the technical field of high-temperature protective coatings, and relates to a preparation method of a MAX phase-based coating. Background technique [0002] M of ternary layered structure n+1 AX n (Where M is part of the transition group metal, A is a group IIIA to VIA element, and X is C or N) Ceramic compounds have the properties of both metal materials and ceramic materials due to their unique nano-layered structure. More and more attention. Similar to metals, MAX phases are easy to process at room temperature, have thermal shock resistance, thermal and electrical conductivity, and damage resistance. In addition, the MAX phase containing Al element has good chemical stability in air and water vapor, showing good corrosion resistance, oxidation resistance and thermal shock resistance of ceramic materials, and has excellent performance in the field of high temperature protective coatings. application prospects. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/02C04B35/56C04B35/622C04B35/626
CPCC23C4/129C23C4/06C23C4/02C04B35/56C04B35/626C04B35/6261C04B35/62222C04B2235/3817
Inventor 任延杰杜华越牛焱陈荐姚艺刘云熊中义李微李聪
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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