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Preparation method of charcoal material surface gradient coating for resisting oxidation

A surface gradient and gradient coating technology, applied in the field of carbon material protection, can solve the problems of difficult large parts, high reaction temperature, coating, etc., and achieve the effects of good thermal shock resistance, good repeatability, and simple process

Inactive Publication Date: 2006-04-26
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the coating is prepared by the solid infiltration method, the substrate is directly buried in silicon powder, MoSi 2 Heat treatment is carried out in isotonic material, the reaction temperature is high, limited by the volume of the heating body and the container, it is difficult to coat large parts, so it is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1). The surface of the carbon material is cleaned, decontaminated, ultrasonically cleaned with distilled water, and then put into a drying oven for drying;

[0021] (2). Preparation of primary SiC coating

[0022] Put Si, H 2 O, polyvinyl alcohol is made into primary mud with a weight ratio of 44.5:53.5:2.0, and this mud is fully ground in a ball mill for 1 hour, so that each component in the mud is evenly distributed. The mud was coated on the cleaned graphite material by spraying method, and then dried in an oven at 150° C. for 10 hours to obtain a dry coating. Put the dried cladding into a graphite crucible, then put the crucible into a vacuum resistance furnace, seal the furnace, evacuate and energize for heating. Heat the furnace to 400°C at a heating rate of 5°C / min, keep it warm for 15 minutes, and then Then, the furnace was heated to 1420° C. at a heating rate of 15° C. / minute, and kept for 30 minutes. Turn off the power to stop heating, and take out the sam...

Embodiment 2

[0028] (1). The surface of the carbon material is cleaned, decontaminated, ultrasonically cleaned with distilled water, and then put into a drying oven for drying;

[0029] (2). Preparation of primary SiC coating

[0030] Silicon powder, water, and binder are Si, H in weight ratio 2 O. Acrylamide=48.0:51.0:1.0 is made into primary mud, and the mud is fully ground in a ball mill for 1 hour, so that the components in the mud are evenly distributed. The slurry was coated on the cleaned graphite material by brush coating, and then dried in an oven at 140° C. for 12 hours to obtain a dry coating. Put the dried cladding body into a graphite crucible, then put the crucible into a vacuum resistance furnace, seal the furnace, vacuumize and energize for heating. Heat the furnace to 500°C at a heating rate of 7°C / min and keep the temperature for 10 minutes, then heat the furnace to 1500°C at a heating rate of 16°C / min and keep the temperature for 20 minutes. Turn off the power to stop...

Embodiment 3

[0036] (1). The surface of the carbon material is cleaned, decontaminated, ultrasonically cleaned with distilled water, and then put into a drying oven for drying;

[0037] (2). Preparation of primary SiC coating

[0038] Silicon powder, water, and binder are Si, H in weight ratio 2 O. Acrylamide=50.0:48.5:1.5 is made into primary mud, and the mud is fully ground in a ball mill for 1 hour, so that the components in the mud are evenly distributed. The slurry was coated on the cleaned graphite material by dip coating, and then dried in an oven at 120° C. for 13 hours to obtain a dry coating. Put the dried cladding body into a graphite crucible, then put the crucible into a vacuum resistance furnace, seal the furnace, vacuumize and energize for heating. The furnace was heated to 440° C. at a heating rate of 9° C. / min and held for 12 minutes, and then the furnace was heated to 1440° C. at a heating rate of 18° C. / min. and held for 24 minutes. Turn off the power to stop heating,...

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Abstract

The present invention is preparation process of gradient oxidation resisting coating on the surface of carbon material. The preparation process includes the steps of: cleaning and stoving the surface of the carbon material; compounding slurring with silica powder, water and adhesive in certain weight proportion, and coating the slurry onto the surface of the carbon material through soaking, spraying or brushing; compounding silica powder, molybdenum powder, water and adhesive into slurry A of Mo / Si ratio 0.3-0.4, slurry B of Mo / Si ratio 0.8-1.2 and slurry C of Mo / Si ratio 1.8-2.3, and coating slurry A, slurry B and slurry C successively onto the surface of the carbon material through soaking, spraying or brushing; and sintering to obtain the product. The present invention has simple technological process, high production efficiency, good repeatability and low production cost and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of carbon material protection, and relates to a method for preparing a gradient high-temperature anti-oxidation coating on the surface of a carbon material. Background technique [0002] Carbon materials have excellent heat resistance, chemical stability and electrical conductivity, and are widely used in high-temperature fields as structural and engineering materials. However, carbon materials begin to undergo oxidation reactions in an oxidizing atmosphere above 400°C, causing rapid deterioration of their physical and mechanical properties. Therefore, the oxidation protection treatment of carbon materials is to prolong their working life, improve their working stability and fundamental measure of reliability. [0003] Coating treatment of carbon materials is a main method to solve the oxidation protection of carbon materials at high temperature (>1200°C). Silicon-based ceramic coatings such as (SiC, Si 3 N 4 )...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/565C04B35/628
Inventor 刘朗赵娟郭全贵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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