Method for preparing carborundum-coke ytterbium silicate composite coating on surface of carbon/carbon composite material

A carbon composite material and composite coating technology, which is applied in the field of preparing SiC-Yb2Si2O7 composite coating on the surface of carbon/carbon composite material, can solve the problems of poor bonding force, unevenness, low density, etc. The effect of uniform coating and high bonding force

Active Publication Date: 2010-08-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yb prepared by this method 2 SiO 5 Coating, uneven, low density, poor bonding force, and its effective time to protect the substrate in static air at 1500°C is only 25 hours

Method used

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  • Method for preparing carborundum-coke ytterbium silicate composite coating on surface of carbon/carbon composite material
  • Method for preparing carborundum-coke ytterbium silicate composite coating on surface of carbon/carbon composite material
  • Method for preparing carborundum-coke ytterbium silicate composite coating on surface of carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step 1: Polish the carbon / carbon composite material, ultrasonically clean it in absolute ethanol for 20 minutes, and dry it at 110°C;

[0015] Step 2: Weigh 65g Si powder, 25g C powder, 10g Al respectively 2 o 3 powder, placed in a ball mill jar, mixed and ball milled for 1 hour to make embedding powder; take half of the embedding powder and put it into a graphite crucible, put it into the carbon / carbon composite material treated in step 1, and then put Cover with the other half of the embedding powder, and add a graphite crucible cover; put the graphite crucible into a vertical vacuum furnace, and after vacuuming, raise the furnace temperature to 1900°C at a heating rate of 5°C / min, keep it warm for 3 hours, and turn off the power Natural cooling, the whole process is protected by argon gas, the flow rate of argon gas is 2L / min, and the carbon / carbon composite material with SiC inner coating is obtained;

[0016] Step 3: Put Yb 2 o 3 Powder and SiO 2 Powder press ...

Embodiment 2

[0020] Step 1: Polish the carbon / carbon composite material, ultrasonically clean it in absolute ethanol for 30 minutes, and then dry it at 120°C;

[0021] Step 2: Weigh 85g Si powder, 10g C powder, 5g Al respectively 2 o 3 powder, placed in a ball mill jar, mixed and ball milled for 2 hours to make embedding powder; take half of the embedding powder and put it into a graphite crucible, put it into the carbon / carbon composite material treated in step 1, and put Cover with the other half of the embedding powder, add a graphite crucible cover; put the graphite crucible into a vertical vacuum furnace, and after vacuuming, raise the furnace temperature to 2300°C at a heating rate of 7.5°C / min, keep it warm for 1h, and turn off the power Natural cooling, the whole process is protected by argon gas, the flow rate of argon gas is 1L / min, and the carbon / carbon composite material with SiC inner coating is obtained;

[0022] Step 3: Put Yb 2 o 3 Powder and SiO 2 Powder press Yb 2 o...

Embodiment 3

[0026] Step 1: Polish the carbon / carbon composite material, ultrasonically clean it in absolute ethanol for 40 minutes, and then dry it at 130°C;

[0027] Step 2: Weigh 75g Si powder, 15g C powder, 10g Al respectively 2 o 3 powder, placed in a ball mill jar, mixed and ball milled for 3 hours to make embedding powder; take half of the embedding powder and put it into a graphite crucible, put it into the carbon / carbon composite material treated in step 1, and then put Cover with the other half of the embedding powder, add a graphite crucible cover; put the graphite crucible into a vertical vacuum furnace, and after vacuuming, raise the furnace temperature to 2100°C at a heating rate of 10°C / min, keep it warm for 2 hours, and turn off the power Natural cooling, the whole process is protected by argon gas, the flow rate of argon gas is 3L / min, and the carbon / carbon composite material with SiC inner coating is obtained;

[0028] Step 3: Put Yb 2 o 3 Powder and SiO 2 Powder pre...

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Abstract

The invention discloses a method for preparing a carborundum-coke ytterbium silicate composite coating on the surface of a carbon / carbon composite material, which is used for solving the technical problem of short anti-oxidation time of a SiC / Yb2SiO5 high-temperature anti- oxidation composite coating prepared by a traditional method. The method comprises the following steps that: first an SiC inner coating is prepared on the carbon / carbon composite material, and then Yb2Si2O7 powder is prepared, and the Yb2Si2O7 powder is sprayed on the surface of the carbon / carbon composite material with the SiC inner coating through supersonic plasma spraying equipment, to form an outer coating. Because the Yb2Si2O7 coating prepared through a supersonic plasma spraying method is uniform and has high density, the SiC inner coating prepared through an embedding method has higher bonding force, the time for which the SiC-Yb2Si2O7 composite coating effectively protects the carbon / carbon composite material in 1500DEG C static air is improved to 430 to 500h from 25h of the prior art.

Description

technical field [0001] The invention relates to a method for preparing a composite coating on the surface of a carbon / carbon composite material, in particular to a method for preparing SiC-Yb on the surface of a carbon / carbon composite material 2 Si 2 o 7 Composite coating method. Background technique [0002] Ytterbium silicate has excellent high temperature stability and environmental durability, and is a potential protective material for carbon / carbon composites. Ytterbium silicate includes ytterbium monosilicate (Yb 2 SiO 5 ) and ytterbium disilicate (Yb 2 Si 2 o 7 ). Document "C f / SiC composite materialSiC / Yb 2 SiO 5 Research on Antioxidant Composite Coatings. Wen Haiming, Dong Shaoming, Ding Yusheng, etc. Rare Metal Materials and Engineering, 2009, 38(9): 1580-1583” disclosed a slurry dip coating method on C f Preparation of Yb on SiC coating surface of SiC composite materials 2 SiO 5 Coating method. Yb prepared by this method 2 SiO 5 The coating has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
Inventor 郭领军韩敏娜李贺军李克智付前刚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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