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Method for preparing C/C composite material nanometer silicon carbide-mullite-molybdenum disilicide composite external coating

A technology of nano-silicon carbide and carbon composite materials, which is applied in the field of preparation of nano-silicon carbide-mullite-molybdenum disilicide composite outer coatings of carbon/carbon composite materials, and can solve problems such as easy-to-crack coating thickness and instant noodles Cracking and other problems, to achieve the effect of low cost, high temperature oxidation protection ability, and convenient operation

Inactive Publication Date: 2010-09-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the outer coating prepared by the sol-gel method is easy to crack and the coating thickness is insufficient [Huang Jian-Feng, Zeng Xie-Rong, Li He-Jun, Xiong Xin-Bo, Sun Guo-ling.Surf.coat. Technol.2005, 190, 255.], the silicon carbide coating prepared by the embedding method has a large stress on the surface, so it is also prone to cracking of instant noodles [Fu Qian-Gang, Li He-Jun, Shi Xiao-Hong, Li Ke-Zhi, Sun Guo-Dong. Scripta Mater.2005, 52, 923.], while the coating prepared by the in-situ forming method needs to be treated at 1500 °C at a high temperature, and cannot be prepared at one time [Huang Jian -Feng, Li He-Jun, Zeng Xie-Rong, Li Ke-Zhi.Surf.coat.Technol.2006, 200, 5379.], also using the slurry coating reaction method to prepare the coating still requires multiple brushes It cannot be prepared in one time and needs post-heat treatment [Huang Min, Li Ke-Zhi, Li He-Jun, Fu Qian-Gang, Sun Guo-DongCarbon.2007, 45, 1105.]

Method used

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  • Method for preparing C/C composite material nanometer silicon carbide-mullite-molybdenum disilicide composite external coating
  • Method for preparing C/C composite material nanometer silicon carbide-mullite-molybdenum disilicide composite external coating
  • Method for preparing C/C composite material nanometer silicon carbide-mullite-molybdenum disilicide composite external coating

Examples

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Effect test

Embodiment 1

[0021] Example 1: 1) Preparation of rod-shaped mullite powder First, 4ml of tetraethyl orthosilicate (SiO 2 %≥28%) dissolved in 20ml of absolute ethanol, and then add 10ml of distilled water, adjust the pH of the solution to 2 with hydrochloric acid, and magnetically stir at room temperature for 0.5h to fully pre-hydrolyze the ethyl orthosilicate, which is counted as solution A; Take 24g of Al(NO 3 ) 3 ·9H 2 O was added to 10ml of distilled water and stirred at room temperature until Al(NO 3 ) 3 ·9H 2 After the O is fully dissolved, pour it into the A solution, place the mixed solution on a magnetic stirrer and stir evenly, then adjust the pH to 4.5 with ammonia water, which is counted as solution B; finally, dry the B solution at 60℃ to become dry Glue, calcining the dry gel in a muffle furnace, set the heating rate to 5°C / min, heat it up to 1150°C, keep it for 2h and then cool it down to room temperature in the furnace to obtain rod-shaped nano-mullite powder; 2) First, add 0....

Embodiment 2

[0023] Example 2: 1) Preparation of rod-shaped mullite powder. First, 6ml of tetraethyl orthosilicate (SiO 2 %≥28%) dissolved in 20ml of absolute ethanol, then add 20ml of distilled water, adjust the pH of the solution to 3 with hydrochloric acid, magnetically stir at room temperature for 1 hour to fully pre-hydrolyze the ethyl orthosilicate, and count it as solution A; 25g of Al(NO 3 ) 3 ·9H 2 O was added to 13ml of distilled water and stirred at room temperature until Al(NO 3 ) 3 ·9H 2 After the O is fully dissolved, pour it into the A solution, place the mixed solution on a magnetic stirrer and stir evenly, then adjust the pH to 5 with ammonia water, which is counted as solution B; finally, dry the B solution at 60°C to dry it Glue, calcining the dry gel in a muffle furnace, set the heating rate to 5°C / min, heat it up to 1150°C, keep it for 2h and then cool it down to room temperature in the furnace to obtain rod-shaped nano-mullite powder; 2) First, add 1g rod-shaped mullite...

Embodiment 3

[0024] Example 3: 1) Preparation of rod-shaped mullite powder. Firstly, 5ml of tetraethyl orthosilicate (SiO 2 %≥28%) was dissolved in 20ml of absolute ethanol, then 15ml of distilled water was added, the pH of the solution was adjusted to 4 with hydrochloric acid, and the ethyl orthosilicate was fully pre-hydrolyzed by magnetic stirring for 1.5h at room temperature, which was counted as solution A; Take 27g of Al(NO 3 ) 3 ·9H 2 O was added to 20ml of distilled water and stirred at room temperature until Al(NO 3 ) 3 ·9H 2 After the O is fully dissolved, pour it into the A solution, place the mixed solution on a magnetic stirrer and stir evenly, then adjust the pH to 5.5 with ammonia water, and count it as solution B; finally, dry the B solution at 60°C to dry it Glue, calcining the dry gel in a muffle furnace, set the heating rate to 5°C / min, heat it up to 1150°C, keep it for 2h and then cool it down to room temperature in the furnace to obtain rod-shaped nano-mullite powder; 2) ...

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Abstract

The invention relates to a method for preparing a C / C composite material nanometer silicon carbide-mullite-molybdenum disilicide composite external coating, which comprises the following steps of: adding mullite powder, nanometer silicon carbide powder and molybdenum disilicide powder into isopropanol and performing ultrasonic oscillation to obtain suspension A; adding an iodine simple substance into the suspension A and performing ultrasonic oscillation to obtain solution B; and pouring the solution B into a hydrothermal reaction kettle, clamping a C / C composite material sample with a SiC internal coating on a cathode clamp in the hydrothermal reaction kettle, performing hydrothermal electrophoresis reaction, naturally cooling to room temperature, taking the sample out and drying the sample to obtain the nanometer silicon carbide-mullite-molybdenum disilicide composite external coating. The reaction is finished in the hydrothermal reaction kettle at one time without subsequent heat treatment, wherein the nanometer silicon carbide powder can fill cracks, micropores and other defects in the coating; and the rodlike mullite whisker has good toughening effect so as to greatly improve the high-temperature oxidation protective capability of the composite coating.

Description

Technical field [0001] The invention relates to a method for preparing a carbon / carbon composite material composite outer coating, in particular to a carbon / carbon composite that adopts hydrothermal electrophoretic deposition to prepare a uniform surface without microcracks, and a uniform thickness without penetrating holes and cracks. Method for preparing material nano silicon carbide-mullite-molybdenum disilicide composite outer coating. Background technique [0002] In recent years, carbon / carbon (C / C) composite materials have gradually become a research focus. Due to the low thermal expansion coefficient, low density, ablation resistance, corrosion resistance, stable friction coefficient, good thermal and electrical conductivity, high strength, and high modulus of carbon / carbon composite materials, especially the mechanical properties do not decrease but increase with increasing temperature Therefore, it is used in aviation, aerospace and civil industry. However, many of it...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 黄剑锋王博杨强曹丽云曾燮榕吴建鹏刘淼
Owner SHAANXI UNIV OF SCI & TECH
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