Preparation method of carbon material surface boride-modified silicon-based antioxidation coating layer

An anti-oxidation coating and carbon material technology, which is applied in the field of preparation of boride MB2 modified silicon-based anti-oxidation coatings on the surface of carbon materials, can solve the problems of difficult control of phase composition and coating thickness, etc.

Active Publication Date: 2018-03-20
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for preparing a boride-modified silicon-based anti-oxidation coating on the surface of a carbon material to solve the problem of preparing MB on the surface of an existing carbon material. 2 -The problem that phase composition and coating thickness are not easy to control in the method of SiC (M=Zr, Ta or Hf) coating

Method used

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  • Preparation method of carbon material surface boride-modified silicon-based antioxidation coating layer
  • Preparation method of carbon material surface boride-modified silicon-based antioxidation coating layer
  • Preparation method of carbon material surface boride-modified silicon-based antioxidation coating layer

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preparation example Construction

[0032] The preparation method of the anti-oxidation coating, first configure MB with controllable content 2 Slurry, where MB 2 In M=Zr, Ta or Hf, brush, dip or spray MB on the surface of carbon material substrate with SiC inner coating 2 The preset layer of the slurry, after the preset layer is obtained, is sintered and combined by ultra-high temperature heat treatment to form a coating.

[0033] The specific steps are:

[0034] Step 1: Ultrasonic cleaning and drying of the carbon material polished by sandpaper with different roughnesses, the carbon material is graphite or C / C composite material;

[0035] Step 2: Prepare the SiC inner coating: uniformly mix Si powder with a mass fraction of 70-90% and C powder with 10-30% and dry it, then put the carbon material treated in step 1 into a graphite crucible and bake it with Wrap the dried powder, then put the graphite crucible with powder and carbon material into the ultra-high temperature heat treatment furnace, pass it into ...

Embodiment 1

[0045] Step 1: Ultrasonic cleaning and drying of graphite after sanding with different roughnesses.

[0046] Step 2: Prepare the SiC inner coating: evenly mix Si powder with a mass fraction of 85% and C powder with 15% and dry it, then put the graphite treated in step 1 into a graphite crucible and use the dried powder Then put the graphite crucible with powder and graphite into the ultra-high temperature heat treatment furnace, pass it into the argon atmosphere for protection, and raise the temperature of the ultra-high temperature heat treatment furnace to 2150 °C at a heating rate of 10 °C / min, keep it for 2 hours, The graphite surface gets a SiC inner coating.

[0047] Step 3: Preparation of TaB 2 -SiC overcoat: TaB 2 Powder (80wt.%), SiC powder (5wt.%), Si powder (10wt.%) and C powder (5wt.%) are evenly mixed and dried, then add a certain amount of silica sol (the volume of silica sol is mixed with The mass ratio of the powder is 2.5ml / g) and placed in a ball mill for ...

Embodiment 2

[0051] Step 1: Ultrasonic cleaning and drying of graphite after sanding with different roughnesses.

[0052] Step 2: Prepare the SiC inner coating: evenly mix Si powder with a mass fraction of 75% and C powder with 25% and dry it, then put the graphite treated in step 1 into a graphite crucible and use the dried powder Then put the graphite crucible with powder and graphite into the ultra-high temperature heat treatment furnace, pass it into the argon atmosphere for protection, and raise the temperature of the ultra-high temperature heat treatment furnace to 2050 °C at a heating rate of 15 °C / min, keep it for 4 hours, The graphite surface gets a SiC inner coating.

[0053] Step 3: Preparation of HfB 2 -SiC overcoat: HfB 2 Powder (60wt.%), SiC powder (10wt.%), Si powder (20wt.%) and C powder (10wt.%) are evenly mixed and dried, then add a certain amount of silica sol (the volume of silica sol is mixed with The ratio of powder mass is 2ml / g) and placed in a ball mill to mix e...

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Abstract

The invention relates to a preparation method of a carbon material surface boride-modified silicon-based antioxidation coating layer, and belongs to a preparation method of a carbon material surface high-temperature antioxidation coating layer. The preparation method of the antioxidation coating layer comprises the following steps of firstly, preparing a boride MB2 slurry with controllable content, wherein M in MB2 is Zr (zirconium), Ta (tantalum) or Hf (hafnium); brushing, impregnating or spraying a preset layer of MB2 slurry to the surface of a carbon material substrate with an SiC (siliconcarbide) inner coating layer; after the preset layer is obtained, performing superhigh-temperature heat treatment sintering, so as to obtain the coating layer. The preparation method is characterizedin that by regulating, controlling and designing a proportional ratio of the slurry powder of composite ceramic, the content of component in the MB2-SiC (M is Zr, Ta or Hf) coating layer can be controlled; by controlling the brushing, impregnating or spraying times, the thickness of the MB2-SiC (M is Zr, Ta or Hf) coating layer can be controlled; the preset layer is subsequently subject to superhigh-temperature sintering heat treatment, so that the density of the coating layer is improved, and the bonding strength of interface of the inner coating layer is improved. The preparation method hasthe advantages that the preparation technology is simple, the coating layer is dense and uniform, the production cost is lower, and the preparation method is suitable for carbon material parts with various shapes and sizes.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature anti-oxidation coating on the surface of a carbon material, in particular to a boride MB on the surface of a carbon material 2 A preparation method of (M=Zr, Ta or Hf) modified silicon-based anti-oxidation coating. Background technique [0002] Carbon materials (graphite, C / C composite materials) are a class of advanced engineering materials with excellent high temperature performance, which have the advantages of high temperature resistance, small specific gravity, high strength, high modulus, high thermal conductivity, low expansion coefficient and thermal shock resistance. , it can withstand the influence of extremely high heating rate in an ultra-high temperature environment on its performance, and with the gradual increase of temperature, its strength shows a gradual increase trend, and can be maintained at high temperatures above 2000 ° C, making it a It is one of the preferred m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B35/83C04B35/52
CPCC04B35/52C04B35/522C04B35/83C04B41/009C04B41/52C04B41/89C04B41/5059C04B41/4531C04B41/507C04B41/4535
Inventor 任宣儒李贺军冯培忠郭立童张平沈承金鞠治成
Owner CHINA UNIV OF MINING & TECH
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