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Composite carbon-resisting coat and method for preparing the same on substrate

A technology of carbon coating and carbon layer, applied in coating, metal material coating process, fusion spraying, etc., can solve problems such as carbon pollution

Inactive Publication Date: 2008-08-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon has high reactivity at high temperature, and it is easy to react with highly active alloying elements such as Nb, Ti, Al, etc. to form metal carbide MC, which causes carbon pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Composite carbon barrier coating is transition layer SiC + carbon barrier layer Y 2 o 3

[0058] (A) 80% of the transition layer SiC powder has a particle size of 70 μm and a thickness of 80 μm;

[0059] (B) Carbon barrier layer Y 2 o 3 80% of the powder material has a particle size of 40 μm and a thickness of 150 μm;

[0060] (C) The specific process of adopting plasma spraying process to make composite carbon barrier coating on the inner surface of graphite crucible is as follows:

[0061] The first step: pretreatment of graphite crucible

[0062] Grind the inner surface of the graphite crucible by sandblasting with compressed air to obtain a surface to be sprayed with a roughness of 60 μm on the inner surface of the graphite crucible, then clean the surface to be sprayed with absolute ethanol for 1 to 3 times, and dry it naturally at 25°C to be used later;

[0063] The sandblasting process is as follows: use 60μm quartz sand, the spraying distance ...

Embodiment 2

[0084] Example 2: Composite carbon barrier coating is transition layer Mo + carbon barrier layer Y 2 o 3

[0085] (A) 80% of the transition layer Mo powder has a particle size of 50 μm and a thickness of 100 μm;

[0086] (B) Carbon barrier layer Y 2 o 3 80% of the powder material has a particle size of 60 μm and a thickness of 200 μm;

[0087] (C) The specific process for making a composite carbon-resistant coating on the inner surface of a graphite crucible by using a low-pressure plasma spraying process is as follows:

[0088] The first step: pretreatment of graphite crucible

[0089] Grind the inner surface of the graphite crucible by sandblasting to obtain a surface to be sprayed with a roughness of 40 μm on the inner surface of the graphite crucible, then clean the surface to be sprayed with absolute ethanol for 1 to 3 times, and dry it naturally at 25°C. use;

[0090] The sandblasting process is as follows: use 60μm quartz sand, spray distance 150mm, spray angle...

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PUM

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Abstract

The present invention discloses a composite carbon-blocking coating material and a method for preparing a composite carbon-blocking coating on the substrate, the composite carbon-blocking coating material is composed of a transition layer and a carbon-blocking layer, the transition layer is SiC or Mo material and the carbon-blocking layer is Y2O3 material. The thickness of the transition layer is 40-120 mu m, and the thickness of the carbon-blocking layer is 100-250 mu m. The graphite crucible which is prepared with SiC-Y2O3 or Mo-Y2O3 composite carbon-blocking coating is smelted in the vacuum inducing smelting furnace for preparing the Ti-base alloy, when the smelting temperature gets to 1700-1750 DEG C the chemical reaction between the carbon element and Ti active metal in the graphite crucible is effectively prevented, the carbon pollution is avoided and the purity of the material being smelted is increased.

Description

technical field [0001] The invention relates to a coating material used on a graphite crucible for smelting high-activity alloys, more particularly, it refers to a composite carbon-resistant coating material that can prevent the external infiltration of carbon elements, and the use of plasma spraying technology in The invention discloses a method for preparing the composite carbon barrier coating on the inner surface of a graphite crucible. Background technique [0002] At present, water-cooled copper crucibles are usually used for smelting high-melting-point alloys with high content of highly active elements such as Ti and Nb. The melting point of copper elements in water-cooled copper crucibles is only 1084°C, and the high-temperature strength is poor, so circulating water cooling is required for use. However, the circulating water often causes the temperature of the alloy liquid in the molten pool to be uneven, the degree of superheat is low, and the composition uniformit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/52C04B41/70C23C4/02C23C4/04C23C4/08C23C4/12C23C4/10C23C4/11C23C4/134
Inventor 徐惠彬龚路杰周春根高明张虎宫声凯
Owner BEIHANG UNIV
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