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Method for preparing HfB2-SiC oxidation resisting coating on surface of carbon-based material

A technology of anti-oxidation coating and carbon-based materials, which is applied in the field of carbon materials to achieve the effects of low sintering temperature, excellent comprehensive performance of the coating, and high bonding strength

Active Publication Date: 2019-12-20
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, the spark plasma sintering method has not been applied to HfB 2 -SiC anti-oxidation coating is being prepared, but the inventors have found through experiments that the spark plasma sintering method can be rapidly sintered at a lower temperature to prepare high-density, low-defect HfB 2 -SiC anti-oxidation coating

Method used

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  • Method for preparing HfB2-SiC oxidation resisting coating on surface of carbon-based material
  • Method for preparing HfB2-SiC oxidation resisting coating on surface of carbon-based material
  • Method for preparing HfB2-SiC oxidation resisting coating on surface of carbon-based material

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Experimental program
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Effect test

Embodiment 1

[0029] Phase analysis such as figure 1 As shown, the cross-sectional morphology is as figure 2 shown.

[0030] Step (1): Surface treatment of the carbon substrate: polish the graphite substrate with sandpaper of different roughnesses, then clean it with alcohol, and finally dry it in the air;

[0031] Step (2): Mixing: First weigh HfB with a mass fraction of 60% 2 Mix with 40% SiC powder, its purity ≥ 99.0%, particle size ≤ 50μm, and then ball mill at a speed of 100r / min for 5h to prepare 60% HfB 2 -40% SiC composite powder;

[0032] Step (3): Molding: In the graphite mold, use 60% HfB obtained through step (2) 2 - 40% SiC composite powder wraps the graphite matrix after step (1), and the graphite matrix is ​​covered with 60% fB 2 The thickness of -40% SiC composite powder is about 0.6 times the thickness of graphite matrix;

[0033]Step (4): Spark plasma sintering: Put the mold with the sample installed in a spark plasma sintering furnace for sintering treatment. The s...

Embodiment 2

[0035] Phase analysis such as image 3 As shown, the cross-sectional morphology is as Figure 4 shown.

[0036] Step (1): Surface treatment of the carbon substrate: polish the graphite substrate with sandpaper of different roughnesses, then clean it with alcohol, and finally dry it in the air;

[0037] Step (2): Mixing: First weigh HfB with a mass fraction of 70% 2 With 30% SiC powder, its purity ≥ 99.0%, particle size ≤ 50μm, and then uniformly mixed at a speed of 50r / min for 10h to prepare 70% HfB 2 -30% SiC composite powder;

[0038] Step (3): Molding: In the graphite mold, use 70% HfB obtained through step (2) 2 -30% SiC composite powder wraps the graphite matrix after step (1), and the matrix is ​​covered with 70% HfB 2 The thickness of -30% SiC composite powder is about 0.5 times the thickness of graphite matrix;

[0039] Step (4): Spark plasma sintering: Put the mold with the sample installed into a spark plasma sintering furnace for sintering treatment. The sinte...

Embodiment 3

[0041] Phase analysis such as Figure 5 As shown, the cross-sectional morphology is as Figure 6 shown.

[0042] Step (1): Surface treatment of the carbon substrate: polish the graphite substrate with sandpaper of different roughnesses, then clean it with alcohol, and finally dry it in the air;

[0043] Step (2): Mixing: first weigh HfB with a mass fraction of 80% 2 With 20% SiC powder, its purity ≥ 99.0%, particle size ≤ 50μm, and then uniformly mixed at a speed of 500r / min for 2 hours to prepare 80% HfB 2 -20% SiC composite powder;

[0044] Step (3): Molding: In the graphite mold, use 80% HfB obtained through step (2) 2 -20% SiC composite powder wraps the graphite matrix after step (1), and the matrix is ​​covered with 80% HfB 2 The thickness of -20% SiC composite powder is about 0.55 times the thickness of graphite matrix;

[0045] Step (4): Spark plasma sintering: Put the mold with the sample installed in a spark plasma sintering furnace for sintering treatment. The ...

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Abstract

The invention discloses a method for preparing an HfB2-SiC oxidation resisting coating on the surface of a carbon-based material. The method comprises the steps of weighing HfB2 and SiC powder of a certain proportion, carrying out uniform mixing, wrapping a carbon base with the uniform-mixed powder in a graphite mold, and placing a sample loaded mold into a spark plasma sintering furnace for sintering treatment, thereby obtaining the HfB2-SiC oxidation resisting coating from the surface of the carbon base, wherein the sintering temperature is 1,200 DEG C to 1,900 DEG C, the heating rate is 5 DEG C / min to 200 DEG C / min, the pressure is 5MPa to 50MPa, and the heat preserving time is 5 to 300 minutes. According to the method, a spark plasma sintering method is applied to the preparation of the HfB2-SiC oxidation resisting coating on the surface of the carbon-based material, and high-density low-defect HfB2-SiC oxidation resisting coatings can be rapidly prepared at quite low temperaturesthrough sintering.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a method for preparing HfB on the surface of carbon-based materials by a plasma discharge sintering method. 2 -SiC anti-oxidation coating. Background technique [0002] Carbon materials (C / C composite materials or graphite) have good high temperature resistance, electrical conductivity, and thermal conductivity due to their many advantages. Carbon materials have low density, high specific modulus, high specific strength, and low vibration attenuation rate, making them the first choice for aerospace materials. Although carbon materials have good high temperature resistance, pure carbon products can work at a high temperature of 3000°C in a vacuum environment, but carbon materials have poor oxidation resistance, and will chemically react with oxygen in air above 400°C. Make carbon material products ineffective. Therefore, the preparation of anti-oxidation coating is an ...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/009C04B41/507C04B41/5059C04B41/4545C04B35/52
Inventor 任宣儒褚洪傲冯培忠王炜光吕君帅李伟武科佑张安妮朱路陈鹏杨青青张鹏黄诗杰马若桐
Owner CHINA UNIV OF MINING & TECH
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