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A method for preparing ti-sic-c composite coating by reactive plasma spraying

A composite coating, ti-sic-c technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of unavoidable pores or holes in the coating, coating performance and quality, etc., to achieve Good high temperature oxidation resistance, quality and performance improvement, high hardness effect

Active Publication Date: 2020-08-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical purpose of the present invention is to aim at the respective deficiencies of TiC and SiC coatings, and obtain a multi-component composite ceramic coating by reactive plasma spraying, but affected by the spraying process, there are inevitably a large number of pores or holes in the coating, have a great impact on the performance and quality of the coating

Method used

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  • A method for preparing ti-sic-c composite coating by reactive plasma spraying
  • A method for preparing ti-sic-c composite coating by reactive plasma spraying
  • A method for preparing ti-sic-c composite coating by reactive plasma spraying

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment is based on a method for preparing and optimizing a Ti-SiC-C ceramic composite coating by plasma spraying, including the following steps:

[0042] Step 1. Weigh the raw materials according to Ti powder 81.8wt%, SiC powder 11.4wt%, and graphite powder 6.8wt%, and the purity is 99.9%; wherein, the particle size of Ti powder is 325 mesh to 500 mesh, and the particle size of SiC powder is 300-600 mesh, the particle size of graphite powder is 8000-15000 mesh.

[0043] Step 2. Add deionized water and gel to the raw material powder (the gel is mixed according to the mass ratio of water: sodium carboxycellulose = 100:1. The composition of the gel is the same in the following examples), and then add the total raw material powder 1% of the mass of PVP is used as a dispersant, mixed, and mechanically stirred for 3 hours to obtain a slurry; wherein, the mass ratio of original powder, deionized water, gel = 2:2:1;

[0044] Step 3. Spray drying: Spray the mixed slurr...

Embodiment 2

[0058] This embodiment is based on a method for preparing and optimizing a Ti-SiC-C ceramic composite coating by plasma spraying, including the following steps:

[0059] Step 1. Weigh the raw materials respectively according to 74wt% of Ti powder, 20wt% of SiC powder and 6wt% of graphite powder, and the purity is 99.9%; wherein, the particle size of Ti powder is 325 mesh to 500 mesh, and the particle size of SiC powder is 300 to 600 mesh. mesh, the particle size of graphite powder is 8000 mesh to 15000 mesh.

[0060] Step 2. Add deionized water and gel to the raw material powder (the gel is mixed according to the mass ratio of water: sodium carboxycellulose = 100:1. The composition of the gel is the same in the following examples), and then add the total raw material powder 1% of the mass of PVP is used as a dispersant, mixed, and mechanically stirred for 3 hours to obtain a slurry; wherein, the mass ratio of original powder, deionized water, gel = 2:2:1;

[0061] Step 3. Spr...

Embodiment 3

[0075] This embodiment is based on a method for preparing and optimizing a Ti-SiC-C ceramic composite coating by plasma spraying, including the following steps:

[0076] Step 1. Weigh the raw materials according to Ti powder 66.7wt%, SiC powder 27.8wt%, and graphite powder 5.5wt%. 300-600 mesh, the particle size of graphite powder is 8000-15000 mesh.

[0077] Step 2. Add deionized water and gel to the raw material powder (the gel is mixed according to the mass ratio of water: sodium carboxycellulose = 100:1. The composition of the gel is the same in the following examples), and then add the total raw material powder 1% of the mass of PVP is used as a dispersant, mixed, and mechanically stirred for 3 hours to obtain a slurry; wherein, the mass ratio of original powder, deionized water, gel = 2:2:1;

[0078] Step 3. Spray drying: Spray the mixed slurry into the drying chamber for atomization, and quickly dry to form agglomerated particles. The inlet temperature of the spray dry...

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Abstract

The invention provides a method for preparing a Ti-SiC-C composite coating through reactive plasma spraying. The method comprises the following steps of adding deionized water, gel and a dispersing agent to Ti powder, SiC powder and graphite powder to obtain mixed slurry; preparing agglomerate composite powder from the mixed slurry through the spray drying process; and spraying the agglomerate composite powder onto a bonding layer through a plasma spraying device, conducting annealing heat treatment in a vacuum or atmosphere protective furnace at the annealing heat treatment temperature of 400DEG C-1400 DEG C and the heating time of 0.5-4 h and then conducting furnace heating and cooling. The coating prepared through the method is more uniform in overall structure, higher in compactness and lower in porosity. The whole operation process is simple. The technological process is simplified. The cost is low relatively.

Description

technical field [0001] The invention relates to a method for preparing a sprayed coating and optimizing the coating quality, in particular to a method for optimizing the preparation of a plasma sprayed coating with high hardness, high wear resistance and high temperature oxidation resistance. Background technique [0002] Preparation of titanium and titanium compound coatings on the surface of ordinary materials to make them special materials for material protection has become an important research content of surface science and engineering. For example, TiC cermet material is a heterogeneous composite material composed of metal or alloy and TiC ceramic phase, which not only maintains the high strength, high hardness, wear resistance, high temperature resistance, oxidation resistance and chemical Stability and other characteristics, but also good metal toughness, high temperature oxidation resistance is only lower than silicon carbide [Chen Yiyuan. 24(3):5-9], is an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/06C23C4/18
CPCC23C4/06C23C4/134C23C4/18
Inventor 章凡勇李超闫姝何继宁殷福星丁一
Owner HEBEI UNIV OF TECH
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