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Preparation method for ablation-resistant coating made of carbon/carbon composite material HfC

A carbon composite material and anti-ablation technology, applied in the field of high temperature resistant materials, can solve the problems of equipment corrosion, low bonding strength between coating and substrate, etc., and achieve the effects of improving bonding strength, reducing residual stress and uniform coating

Active Publication Date: 2011-06-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using this method to prepare HfC coatings, the reaction product HCl will seriously corrode the equipment, and the bonding strength between the coating and the substrate is low

Method used

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  • Preparation method for ablation-resistant coating made of carbon/carbon composite material HfC
  • Preparation method for ablation-resistant coating made of carbon/carbon composite material HfC
  • Preparation method for ablation-resistant coating made of carbon/carbon composite material HfC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Grind and polish the carbon / carbon composite material with No. 400, No. 800, and No. 1200 SiC water-grinding paper in sequence, then ultrasonically clean it in acetone for 20 minutes, and put it in an oven at a temperature of 100°C to dry;

[0026] (2) Add Hf powder, rare earth metal oxide powder, AlN powder and graphite powder into an alumina ball mill jar and mix to obtain a mixture, then add ethyl acetate and nitro varnish into the ball mill jar, and ball mill and mix for 24 hours to prepare a slurry ; The mass percentage of Hf powder in the mixture is 70%, the mass percentage of rare earth metal oxide powder is 15%, the mass percentage of AlN powder is 5%, graphite powder is surplus, and described rare earth metal oxide powder is La 2 o 3 Powder, the mass sum of the ethyl acetate and nitro varnish is 50% of the mixture mass; the mass ratio of the ethyl acetate and nitro varnish is 2:1;

[0027] (3) Evenly brush the slurry on the surface of the dried carbon / carb...

Embodiment 2

[0033] This embodiment is the same as Embodiment 1, and the difference is that the rare earth metal oxide powder used is Er 2 o 3 、Sc 2 o 3 、Lu 2 o 3 , La 2 o 3 , Yb 2 o 3 、Ce 2 o 3 and Gd 2 o 3 One of, or Y 2 o 3 、Er 2 o 3 、Sc 2 o 3 、Lu 2 o 3 , La 2 o 3 , Yb 2 o 3 、Ce2 o 3 and Gd 2 o 3 At least two of the

[0034] The HfC anti-ablation coating prepared in this example has a high bonding strength with the carbon / carbon composite material, and the coating is dense and uniform without cracks.

Embodiment 3

[0036] (1) Grind and polish the carbon / carbon composite material with No. 400, No. 800, and No. 1200 SiC water-grinding paper in sequence, then ultrasonically clean it in ethanol for 40 minutes, and dry it in an oven at a temperature of 200 ° C;

[0037] (2) adding Hf powder, rare earth metal oxide powder, AlN powder and graphite powder into a polyurethane ball mill tank and mixing to obtain a mixture, then adding ethyl acetate and nitrovarnish to the ball mill tank, and ball milling and mixing for 48 hours to prepare a slurry; The mass percentage of Hf powder in the mixture is 89%, the mass percentage of rare earth metal oxide powder is 5%, the mass percentage of AlN powder is 1%, graphite powder is balance, and described rare earth metal oxide powder is Sc 2 o 3 Powder, the mass sum of the ethyl acetate and the nitro varnish is 100% of the mass of the mixture; the mass ratio of the ethyl acetate and the nitro varnish is 1:1;

[0038] (3) Evenly brush the slurry on the surfa...

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Abstract

The invention discloses a preparation method of an ablation-resistant made of a carbon / carbon composite material HfC. The method comprises the following steps of: I, polishing the carbon / carbon composite material, cleaning and drying; II, mixing by ball-milling to prepare slurry; III, uniformly brushing or spraying the slurry onto the surface of the carbon / carbon composite material; and IV, sintering under the protection of inert gas to prepare the ablation-resistant made of the carbon / carbon composite material HfC. By adopting the method, damage on carbon fibers caused by the reaction of HfO2 and C in a substrate modification process is overcame, the permeation capability of Hf is enhanced due to the addition of a rare earth metal oxide and AlN, and the coating is uniform, compact and flawless; in addition, a constituent transition gradient coating is formed between the coating and the carbon / carbon composite material, so that the residue stress of the coating is reduced, the bonding strength between the HfC coating and the carbon / carbon composite material is enhanced, and the high-temperature intensity of the HfC is enhanced.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant materials, and in particular relates to a preparation method of a carbon / carbon composite HfC anti-ablation coating. Background technique [0002] Carbon / carbon composite material is currently the only material that can maintain high mechanical properties above 2000 °C. It has a series of excellent properties such as low density, high specific strength, high specific modulus, low thermal expansion coefficient and thermal shock resistance, especially with The unique property that the strength does not decrease but increases with the increase of temperature has unique advantages as an ultra-high temperature thermal structural material. However, carbon / carbon composites have poor ablation resistance in high-temperature oxidation, high-velocity gas flow, and high-speed particle flow scour environments. The main methods to improve the ablation resistance of carbon / carbon composites ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 华云峰李争显杜继红杜明焕徐海龙
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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