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Magnesium oxide ceramic composite carbon fiber and preparation method thereof

A composite carbon fiber and ceramic composite technology, which is applied in fiber processing, textiles and papermaking, etc., to achieve the effects of overcoming mechanical strength and toughness, stabilizing the preparation process, and improving thermal oxidation resistance

Active Publication Date: 2022-07-12
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty restricting the practical application of ceramic materials is its brittleness and physical and chemical compatibility with carbon fiber composite materials.

Method used

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  • Magnesium oxide ceramic composite carbon fiber and preparation method thereof
  • Magnesium oxide ceramic composite carbon fiber and preparation method thereof
  • Magnesium oxide ceramic composite carbon fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Surface modification of carbon fiber

[0035] First, measure 300ml of a mixed solution of ethanol and acetone with a volume ratio of 1:1 as a cleaning agent, and then ultrasonically clean 1 g of carbon fiber without any treatment for 40 minutes. ; Then acidify the desizing carbon fiber with 50% nitric acid solution at 60°C for 2h (acidified carbon fiber CF-COOH), wash with water until neutral, and dry at 80°C for use.

[0036] (2) Magnesium oxide sol-gel coated surface-modified carbon fibers

[0037] Weigh 148g of propionic acid, dissolve it in 700g of water, the dissolution temperature is 35°C, and the stirring speed is 200r / min for 30min. After the solution is completely mixed, add 80g of magnesium oxide powder and continue to stir until the solution is completely clear. The solution was concentrated under reduced pressure to a homogeneous colorless sol-gel slurry with a viscosity of 135 Pa·s at 55°C. Then, 1 g of the surface-modified carbon fiber was dipped in ...

Embodiment 2

[0045] (1) Surface modification of carbon fiber

[0046] First, measure 300 ml of a mixed solution of ethanol and acetone with a volume ratio of 1:2 as a cleaning agent, and then ultrasonically clean 1 g of carbon fiber without any treatment for 40 minutes. ; Then acidify the desizing carbon fiber with 50% nitric acid solution at 60°C for 2h (acidified carbon fiber CF-COOH), wash with water until neutral, and dry at 80°C for use.

[0047] (2) Magnesium oxide sol-gel coated surface-modified carbon fibers

[0048] Weigh 148g of propionic acid, dissolve it in 700g of water, the dissolution temperature is 35°C, and the stirring speed is 200r / min for 30min. After the solution is completely mixed, add 80g of magnesium oxide powder and continue to stir until the solution is completely clear. The solution was concentrated under reduced pressure to a homogeneous colorless sol-gel slurry with a viscosity of 145 Pa·s at 55°C. Then 1 g of the surface-modified carbon fiber was dipped in ...

Embodiment 3

[0055] (1) Surface modification of carbon fiber

[0056] First, measure 200ml of a mixed solution of ethanol and acetone with a volume ratio of 1:1 as a cleaning agent, then ultrasonically clean 0.5g of carbon fiber without any treatment for 40 minutes. 10h; then acidified the desizing carbon fiber with 50% nitric acid solution at 60°C for 2h (acidified carbon fiber CF-COOH), washed with water until neutral, and dried at 60°C for use.

[0057] (2) Magnesium oxide sol-gel coated surface-modified carbon fibers

[0058] Weigh 60g of acetic acid, dissolve it in 200g of water, the dissolution temperature is 35°C, and the stirring speed is 200r / min for 30min. After the solution is completely mixed, add 40g of magnesium oxide powder and continue to stir until the solution is completely clear. At 65 °C, it was concentrated to a homogeneous colorless sol-gel slurry with a viscosity of 155 Pa·s by distillation under reduced pressure. Then 0.5 g of surface-modified carbon fibers were d...

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Abstract

The invention relates to a magnesium oxide ceramic composite carbon fiber and a preparation method thereof. The composite carbon fiber is a ceramic surface modified carbon fiber coated by magnesium oxide sol. The highest heat-resistant oxidation temperature of the composite carbon fiber in air reaches 1540 DEG C. The monofilament tensile strength of the composite carbon fiber is 0.5 to 1.1 GPa. Compared with the prior art, the magnesium oxide ceramic composite carbon fiber has the beneficial effects that the magnesium oxide ceramic composite carbon fiber has excellent thermal oxidation resistance and monofilament tensile property. The magnesium oxide ceramic composite carbon fiber can be potentially applied to the fields of advanced aero-engines, advanced nuclear energy and the like, and is simple in preparation method, low in cost and suitable for large-scale production, and raw materials are easy to obtain.

Description

technical field [0001] The invention relates to the technical field of ceramic composite materials; in particular, to a magnesium oxide ceramic composite carbon fiber and a preparation method thereof. Background technique [0002] When a hypersonic vehicle is flying at high speed in the atmosphere, the aerodynamic heating will seriously damage the structural strength of the aircraft. The thermal protection material of the aircraft must have the characteristics of high temperature resistance (1100-2200℃), high strength, high toughness and light weight. Fiber-based refractory materials can overcome the shortcoming of brittle fracture of ceramic materials through pull-off / bridging effect and crack bending and turning effect, and greatly improve the toughness of refractory materials. High-strength magnesia fiber hot plate and special-shaped parts can overcome the brittleness of ordinary magnesia ceramic materials, and can be used in ultra-high temperature (1800-2700 ℃) environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/04C04B35/624D06M11/44
CPCC04B35/80C04B35/04C04B35/624D06M11/44D06M2101/40C04B2235/5248C04B2235/96C04B2235/9684Y02E60/10
Inventor 王守凯朱洪喆王广兴王海洋刘书林
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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