Preparation method of charcoal material surface coating for resisting high temperature oxidation

A high-temperature anti-oxidation and carbon material technology, which is applied in the field of carbon material protection, can solve the problems of reducing economic benefits and complicating the process, and achieves the effects of good repeatability, avoiding coating peeling, 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

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Problems solved by technology

This complicates the whole process and reduces its economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Si, B, H 2 O, polyvinyl alcohol is formulated into a slurry with a weight ratio of 50.5:3:45:1.5, and is fully ground in a ball mill for 1 hour to make each component in the slurry evenly distributed. The slurry is coated on the surface of the cleaned graphite material by a dip coating method, and the thickness of the coated slurry is 200 μm. Then, it was dried in an oven at 100° C. for 16 hours to obtain a dried 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 400°C at a heating rate of 5°C / min, keep it warm for 20 minutes, then heat the furnace to 1450°C at a heating rate of 20°C / min, and keep it warm for 25 minutes. Turn off the power to stop heating, and take out the furnace after it cools down sample. The anti-oxidation test was done in the air at 1300°C. The uncoated graphite was oxidized for 1 hour, and the weight loss...

Embodiment 2

[0018] Si, B, H 2 O, polyvinyl alcohol is formulated into slurry at a weight ratio of 45.5:8:45:1.5, and is fully ground in a ball mill for 1 hour to make each component in the slurry evenly distributed. The slurry is coated on the surface by brushing The surface of the cleaned graphite material is covered with a slurry with a thickness of 230 μm. Then, it was dried in an oven at 120° C. for 14 hours to obtain a dried coating. Put the dry cladding into a graphite crucible, then put the crucible into a vacuum resistance furnace, seal the furnace, vacuumize it and heat it with electricity. Heat the furnace to 450°C at a heating rate of 8°C / min, keep it warm for 15 minutes, and then Then heat the furnace to 1500°C at a heating rate of 15°C / min, and keep it warm for 20 minutes. Turn off the power to stop heating, and take out the sample after the furnace cools down. The oxidation resistance test was done in the air at 1300°C. The uncoated graphite was oxidized for 1 hour, and th...

Embodiment 3

[0020] Si, B, H 2 O, acrylamide, prepared into a slurry at a weight ratio of 43.5:10:45.5:1.0, fully ground in a ball mill for 1 hour, so that the components in the slurry are evenly distributed. Use the spray method to coat the slurry on the cleaning surface Clean carbon / carbon composite surface, coated with a slurry thickness of 240 μm. Then, it was dried in an oven at 150° C. for 10 hours to obtain a dried coating. Put the dry cladding into a graphite crucible, then put the crucible into a vacuum resistance furnace, seal the furnace, vacuumize it and heat it with electricity. Heat the furnace to 500°C at a heating rate of 10°C / min, keep it warm for 10 minutes, and then Then heat the furnace to 1440°C at a heating rate of 18°C / min, and keep it warm for 30 minutes. Turn off the power to stop heating, and take out the sample after the furnace cools down. The oxidation resistance test was done in the air at 1300°C. The uncoated graphite was oxidized for 1 hour, and the weight...

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Abstract

The present invention is preparation process of high temperature 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, boron powder, water and adhesive in certain weight proportion, coating the slurry onto the surface of the carbon material through soaking, spraying or brushing to form slurry layer of 200-240 micron thickness, drying, heating in vacuum resistive furnace first at 400-500 deg.c for 10-20 min and then at 1420-1500 deg.c for 20-30 min, and cooling to obtain high temperature oxidation resisting ceramic coating. 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 relates to a method for preparing a high-temperature anti-oxidation coating on the surface of carbon materials, which belongs to the field of protection of carbon materials. 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). SiC coating has high thermal stability, good chemical compati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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