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Plasma spraying method used for preparing titanium-silicon-carbon composite coating layer

A plasma and carbon composite technology, applied in coating, metal material coating process, melting spray plating, etc., to achieve the effect of fine grain, good wear resistance, and improved compactness

Active Publication Date: 2018-08-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, Si powder is used as silicon source, graphite powder is used as carbon source, mechanically mixed with Ti powder in different proportions, and a certain proportion of deionized water, dispersant and binder are added for mechanical stirring to obtain a mixed slurry, which is sprayed Ti-Si-graphite agglomerated powder coated with graphite and Si powder is obtained by dry granulation. The particle size is suitable and the coating uniformity is good. It is very suitable as a plasma spraying feed and overcomes the powder inhomogeneity caused by traditional direct mechanical mixing. It is beneficial to the full reaction of the powder in the plasma spraying process

Method used

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  • Plasma spraying method used for preparing titanium-silicon-carbon composite coating layer

Examples

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Embodiment 1

[0032] In this embodiment, a method for preparing a Ti-Si-C cermet composite coating by reactive plasma spraying based on agglomerated powder modification comprises the following steps:

[0033] Step 1, according to Ti powder 73.5wt%, silicon powder 14.3wt%, graphite powder 12.2wt% take raw material respectively, and purity is 99.9%; Wherein, the particle size of Ti powder is 325 mesh~500 mesh, and the particle size of Si powder is 2000-4000 mesh, the particle size of graphite powder is 8000-15000 mesh.

[0034] 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;

[0035] Step 3. Spray dr...

Embodiment 2

[0047] In this embodiment, a method for preparing a Ti-Si-C cermet composite coating by reactive plasma spraying based on agglomerated powder modification comprises the following steps:

[0048] Step 1, according to Ti powder 64.5wt%, silicon powder 25wt%, graphite powder 10.5wt% take raw material respectively;

[0049] Step 2. In addition, according to the total mass of raw powder, the mass of deionized water, and the gel mass ratio of 2:2:1, add 1% of the total mass of raw powder PVP as a dispersant, mix, and mechanically stir for 3 hours to obtain a slurry;

[0050] 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 dryer is 260°C, and the outlet temperature is 110°C;

[0051] Step 4. Use a sieve to select the agglomerated particles with a size of 100 mesh to 300 as spray feed;

[0052] Step 5. Polish the 45# steel substrate with sandpaper, and then perform...

Embodiment 3

[0062] In this embodiment, a method for preparing a Ti-Si-C cermet composite coating by reactive plasma spraying based on agglomerated powder modification comprises the following steps:

[0063] Step 1, taking raw materials respectively according to Ti powder 57wt%, silicon powder 30wt%, graphite powder 13wt%;

[0064] Step 2. In addition, according to the total mass of raw powder, the mass of deionized water, and the gel mass ratio of 2:2:1, add 1% of the total mass of raw powder PVP as a dispersant, mix, and mechanically stir for 3 hours to obtain a slurry;

[0065] 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 dryer is 260°C, and the outlet temperature is 110°C;

[0066] Step 4. Use a sieve to select the agglomerated particles with a size of 100 mesh to 300 as spray feed;

[0067] Step 5. Polish the 45# steel substrate with sandpaper, and then perform ...

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Abstract

The invention discloses a plasma spraying method used for preparing a titanium-silicon-carbon composite coating layer. The plasma spraying method comprises following steps: raw material powder, including 55 to 80% of Ti powder, 10 to 30% of Si powder, and 10 to 15% of graphite powder, is weighted at a mass ratio; the raw material powder is mixed with deionized water, a gel, and a dispersant so asto obtain a mixed slurry; the mixed slurry is subjected to spray drying so as to obtain an agglomerate composite powder; and a bonding layer is coated with the obtained spray material powder via spraying so as to obtain the titanium-silicon-carbon composite coating layer. The thickness of the titanium-silicon-carbon composite coating layer ranges from 200 to 300<mu>m. The obtained titanium-silicon-carbon composite coating layer is high in coating hardness, and excellent in wear resistance.

Description

technical field [0001] The invention relates to a preparation method of a sprayed coating, in particular to a plasma sprayed coating with high hardness and high wear resistance and a preparation method thereof. Background technique [0002] TiC cermets have high hardness and wear resistance, and are widely used in protective coatings for structural materials, but single-component TiC coatings have a greater tendency to be brittle, and are easy to peel off during use, and are prone to cracks when used in high-temperature environments. Therefore, material workers add metal (Ni, Mo, Fe, etc.) or ceramic phases (TiN, TiCN, TiB, etc.) There is a thermal expansion coefficient matching problem. In recent years, Ti-Si-C ternary compounds (typically represented as Ti3SiC2) have received extensive attention, which not only has good metallic properties (electrical conductivity, thermal conductivity, plasticity and processability), but also has high melting point and corrosion resistan...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06C23C4/134
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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