Preparation method of compact composite coating layer based on reactive plasma spraying and laser remelting
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A technology of laser remelting and composite coating, which is applied in the field of surface treatment to achieve the effect of improving microscopic appearance, reducing coating cracking tendency and improving coating quality
Pending Publication Date: 2020-02-21
HARBIN UNIV OF SCI & TECH
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[0005] The present invention aims to solve the problem of denseness of the in-situ endogenous coating prepared by the existing reactive plasma spraying method, and provides a method for preparing a dense composite coating based on reactive plasma spraying and laser remelting
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specific Embodiment approach 1
[0034] Specific Embodiment One: The preparation method of the dense composite coating based on reactive plasma spraying and laser remelting in this embodiment includes the following steps:
[0035] Step 1. Prepare spray powder:
[0036] The powder, deionized water, ammonium citrate and gum arabic are ball milled and mixed to obtain a slurry, which is sprayed and granulated to obtain a mixed spray powder; the powder includes zirconium powder (Zr), boron carbide powder (B 4 C) and silicon powder (Si);
[0037] Step 2, pretreatment of matrix material:
[0038] Sandblasting the surface of the ZrC-SiC substrate, then cleaning the ZrC-SiC substrate with absolute ethanol in an ultrasonic cleaner, and drying to obtain a pretreated ZrC-SiC substrate;
[0039] The ZrC-SiC matrix is prepared by a hot-press sintering method: ZrC powder and SiC powder are ball-milled and mixed, and then prepared by vacuum hot-press sintering;
[0040] Step 3. Prepare the coating using RPS technology: ...
specific Embodiment approach 2
[0047] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the molar ratio of zirconium powder, boron carbide powder and silicon powder in the powder in step 1 is 1:0.456:0.368. Others are the same as in the first embodiment.
[0048] The final product ZrB that adopts the ratio generation of present embodiment 2 - SiC in SiC-ZrC is 20vol.%. At this time, the high temperature performance of the material is better.
specific Embodiment approach 3
[0049] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step one, the mass ratio of powder, deionized water, ammonium citrate and gum arabic is 1:(1.5~2):(0.4~0.8) : (1~2). Others are the same as in the first embodiment.
[0050] Selecting the mass ratio of this embodiment can give the slurry reasonable viscosity and fluidity, and ensure the smooth completion of spray granulation.
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Abstract
The invention discloses a preparation method of a compact composite coating layer based on reactive plasma spraying and laser remelting, relates to a surface treatment method, and in particular, relates to the preparation method of the compact composite coating layer based on reactive plasma spraying and laser remelting. The method aims to solve the problem of compactness of an in-situ endogenouscoating layer prepared by a reactive plasma spraying method in the prior art. The method comprises the steps: 1, mixing powder, deionized water, ammonium citrate and Arabic gum to obtain slurry, and carrying out spray granulation on the slurry to obtain mixed spray powder; 2, carrying out sand blasting treatment on the surface of a base body, cleaning and drying; 3, filling a plasma spray gun withthe mixed spraying powder, and spraying the mixed spraying powder on the base body obtained in the step 2 to obtain a coating layer; and 4, mounting a coating layer test piece on a workbench of a laser device, and carrying out laser remelting. According to the method, the microstructure of the coating layer can be improved, a uniform and compact laser remelting layer is formed, and the quality ofthe coating layer is effectively improved. The method is applied to the field of surface pretreatment.
Description
technical field [0001] The invention relates to a surface treatment method, in particular to a dense ZrB based on reactive plasma spraying and laser remelting 2 -Preparation method of SiC-ZrC composite coating. Background technique [0002] Zirconium carbide ceramics (ZrC) are one of the most promising high-temperature structural candidates due to their ultrahigh melting point and hardness, as well as good thermal and electrical conductivity. However, the main problem limiting its engineering application is its low high-temperature oxidation resistance. [0003] As a typical ultra-high temperature ceramic, ZrB 2 -SiC composite ceramics exhibit excellent resistance to oxidation and ablation during the long-term loading process with oxyacetylene flame, electric arc or plasma arc as the heat source, and are a promising material for high-temperature protective coatings. In 1998, NASA Ames Research Center in ZrB 2 -Based on SiC material, ZrB was prepared by in situ reaction ...
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