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Metallic matrix surface composite coating and preparation method thereof

A surface composite and metal matrix technology, applied in the direction of metal material coating technology, metal layered products, coatings, etc., can solve the problems of not using coating design, etc., to achieve good heat insulation performance, good self-healing function, The effect of good compactness

Inactive Publication Date: 2010-12-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] And currently, Al 2 o 3 / TiC composites have not yet been applied to coating design

Method used

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  • Metallic matrix surface composite coating and preparation method thereof
  • Metallic matrix surface composite coating and preparation method thereof
  • Metallic matrix surface composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of above-mentioned composite coating is:

[0020] (1) Nano-TiC and Al 2 o 3 The powders are sprayed and granulated separately, and after granulation, TiC powder and Al 2 o 3 Powder (its preferred value is less than 80 μm); nano-TiC and Al 2 o 3 The powder is mixed evenly according to the above ratio, and spray granulation is carried out, and the mixed powder with a particle size of less than 120 μm (the preferred value is less than 80 μm) is screened out; the surface of the metal substrate (chrome hardness <40) is cleaned and degreased, and then sandblasting is performed. , increase the roughness of the surface (contribute to the good combination of the coating and the substrate)

[0021] TiC and Al for spraying 2 o 3 The powder is granulated from nanoparticles, and the fine nanostructure is still maintained inside the granulated powder particles, which will help to form a dense coating. During the mixed powder granulation process, the con...

example 1

[0027] (1) TiC and Al with particle sizes of 30nm and 40nm respectively 2 o3 The powders were spray granulated separately; TiC and Al were mixed according to the mass ratio of 4:6 2 o 3 Mix and granulate, and control the amount of water, so that the granulated particles are about 100 μm. Dry the granulated powder in an electric furnace at 130°C for 30 minutes, and then use a 200-mesh test sieve to separate the powder with a particle size of less than 80 μm.

[0028] (2) Put the test martensitic steel (chrome hardness=20) matrix into acetone and carry out ultrasonic cleaning to remove the oil on the surface; after drying, use a sandblasting machine to roughen the surface of the matrix, using a particle size of 60μm brown corundum is used as sand material.

[0029] (3) Spray each layer in sequence according to the following spraying parameters. After each layer is sprayed, immediately spray the layer above it, otherwise cracks will easily appear between the layers.

[0030]...

example 2

[0036] (1) TiC and Al with particle sizes of 30nm and 40nm respectively 2 o 3 The powders were spray granulated separately; TiC and Al were mixed according to the mass ratio of 2:8 2 o 3 Mix and granulate, control the amount of water inflow, so that the granulated particles are smaller than 200μm. Dry the granulated powder in an electric furnace at 130°C for 30 minutes, and then use a 200-mesh test sieve to separate the powder with a particle size of less than 80 μm.

[0037] (2) Put the test martensitic steel (chrome hardness=25) matrix into acetone and carry out ultrasonic cleaning to remove the oil stain on the surface; after drying, use a sandblasting machine to roughen the surface of the matrix, using a particle size of 60μm brown corundum is used as sand material.

[0038] (3) Spray each layer sequentially according to the spraying parameters in Example 1. Immediately after each coat is applied, apply the coat above it.

[0039] (4) For the prepared TiC+TiC / Al 2 o...

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Abstract

The invention discloses a metallic matrix surface composite coating and a preparation method thereof. The composite coating comprises a TiC layer, a mixed layer and an Al2O3 layer, wherein the TiC layer is combined with the matrix surface, and the mixed layer and the Al2O3 layer are successively arranged on the TiC layer; the thickness of each layer is 20-50 mu m, and the total thickness of the coating is less than or equal to 150 mu m; the mixed layer is composed of Al2O3 and TiC, TiC accounts for 20-50 wt%, and the matrix is metal material of which the chromium hardness is less than 40. Nanometer TiC, Al2O3 and the mixed powder of nanometer TiC and Al2O3 are respectively sprayed and pelleted to respectively screen powder of which the particle diameter is less than 120 mu m; TiC powder is utilized to spray one layer of TiC on the matrix surface; then, mixed powder is utilized to spray the mixed layer on the TiC layer; Al2O3 powder is utilized to spray the Al2O3 layer on the mixed layer; finally, the sprayed sample is put into an oxidation electric furnace and is heated and processed for more than one hour at above 500 DEG C; and air is continuously introduced in the heating and processing process. The composite coating provided by the invention has good heat insulation and penetration prevention performance, has favorable self-healing function and shows excellent compactness after repeated thermal shock.

Description

technical field [0001] The invention belongs to the metal surface treatment technology, in particular to a composite coating on the surface of a metal substrate and its preparation method, which is mainly aimed at the surface treatment of alloys and other metal products, especially the anticorrosion of superalloys, engines and various structural steels , anti-penetration and thermal insulation coating. Background technique [0002] Ceramic materials have excellent properties such as high temperature resistance and corrosion resistance. Ceramics used as coatings are widely used in technical fields such as heat insulation, oxidation resistance, and penetration prevention. However, the brittleness of ceramic materials largely affects the reliability and consistency of material performance. [0003] In industrial production, due to the one-time utilization of ceramic coatings, if there are cracks in the coating, the entire product will quickly fail due to the crack propagation ...

Claims

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Application Information

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IPC IPC(8): B32B9/04B32B15/04C23C4/10C23C4/12C23C4/11C23C4/134
Inventor 索进平高继峰
Owner HUAZHONG UNIV OF SCI & TECH
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