Method of preparing ceramic coating by flame heat spray painting thermit packaged silicon carbide particles

A technology of wrapping silicon carbide and ceramic coatings, which is applied in the field of preparation of thermite-wrapped silicon carbide particle ceramic coatings, can solve problems such as limitations and achieve the effect of preventing thermal sublimation

Inactive Publication Date: 2009-01-07
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the decomposition and sublimation of silicon carbide at high temperature, its application in the field of thermal spraying technology is limited.

Method used

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  • Method of preparing ceramic coating by flame heat spray painting thermit packaged silicon carbide particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: First, compound ferric oxide powder of 400-800 mesh with aluminum powder of 400-800 mesh to form a thermite; then combine the thermite with alumina particles of 400-800 mesh and silicon carbide of 400-800 mesh According to the mass ratio of 1:0.5:2.0, the polymer binder with a degree of polymerization of 1000-5000 is recombined and reconstructed, and the particle size is 160-400 mesh. The inner layer is silicon carbide, the middle layer is thermite, and the outer layer is alumina. Spherical composite particles with a three-layer wrapping structure; finally, put the spherical composite particles into a powder hopper of a spray gun for thermal spraying by an oxygen-acetylene flame to form a ceramic coating.

Embodiment 2

[0010] Example 2: First, compound ferric oxide powder of 400-800 mesh with aluminum powder of 400-800 mesh to form a thermite; then combine the thermite with alumina particles of 400-800 mesh and silicon carbide of 400-800 mesh According to the mass ratio of 1:1.0:0.5, it is restructured by polymer binder with a degree of polymerization of 1000-5000, and the particle size is 160-400 mesh. The inner layer is silicon carbide, the middle layer is thermite, and the outer layer is alumina. Spherical composite particles with a three-layer wrapping structure; finally, put the spherical composite particles into a powder hopper of a spray gun for thermal spraying by an oxygen-acetylene flame to form a ceramic coating.

Embodiment 3

[0011] Example 3: First, compound ferric oxide powder of 400-800 mesh with aluminum powder of 400-800 mesh to form a thermite; then combine the thermite with alumina particles of 400-800 mesh and silicon carbide of 400-800 mesh According to the mass ratio of 1:0.1:1.5, it is restructured by polymer binder with a degree of polymerization of 1000-5000, and the particle size is 160-400 mesh. The inner layer is silicon carbide, the middle layer is thermite, and the outer layer is alumina. Spherical composite particles with a three-layer wrapping structure; finally, put the spherical composite particles into a powder hopper of a spray gun for thermal spraying by an oxygen-acetylene flame to form a ceramic coating.

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Abstract

The present invention relates to a preparation method for ceramic coating of flame thermal spraying thermite coated silicon carbide grain, which comprises the steps of that: firstly, the ferric oxide powder and the aluminum powder are compounded to form thermite; and then the thermite, the alumina grain and the silicon carbide grain are compounded and rebuilt by macromolecule anchoring agent to form the spherical compounded grain with a three layers packaged structure, that is an inner layer of silicon carbide, a middle layer of thermite and an outer layer of alumina; finally, the spherical compounded grain is loaded in the powder bucket of the spraying gun, and the thermal spraying is executed by means of oxy-acetylene flame to form ceramic coating. In the present invention, the spraying raw materials are rebuilt and compounded, so that the silicon carbide grain will not contact with the flame directly in the oxy-acetylene flame thermal spraying process, which effectively prevent the silicon carbide grain from thermal sublimation in high temperature, thereby the silicon carbide grain can sediment onto the surface of the substrate uniformly and compactly so as to obtain the high performance ceramic thermal spraying coating of alumina enhanced by silicon carbide.

Description

technical field [0001] The invention relates to a preparation method of a thermite-wrapped silicon carbide particle ceramic coating, in particular to a preparation method of flame thermal spraying thermite-wrapped silicon carbide particle ceramic coating. Background technique [0002] Thermal spraying technology is a very important technology in the field of surface engineering. It uses a heat source to heat the coating material to a molten or semi-molten state, and then sprays it at a certain speed with the help of the flame itself or the impact of compressed air. The pretreated substrate surface forms a coating with certain functions (wear resistance, corrosion resistance, thermal barrier, etc.). [0003] Ceramic materials have become ideal coating materials due to their advantages such as oxidation resistance, high hardness, wear resistance, and high temperature resistance. Silicon carbide (SiC) has excellent properties such as strong oxidation resistance, good wear resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628
Inventor 杨建桥杨保兴段素霞蒋向军张欣
Owner SHAANXI UNIV OF SCI & TECH
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