Method for manufacturing silicon carbide nanometer fibre/carbon fibre composite felt body

A nanofiber and composite felt technology is applied in the field of felt body preparation to achieve the effects of convenient operation, simple equipment and easy control

Inactive Publication Date: 2008-08-27
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in traditional C / C or C / SiC composite materials, no matter whether the carbon fiber in the felt is woven in 3D or 4D, its strength, toughness, electrical conductivity, thermal conductivity and other mechanical or physical properties have great anisotropy.

Method used

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  • Method for manufacturing silicon carbide nanometer fibre/carbon fibre composite felt body
  • Method for manufacturing silicon carbide nanometer fibre/carbon fibre composite felt body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Soak the needle-punched whole carbon felt with acetone for 24 hours, repeatedly soak and clean it with deionized water, and after drying, use this sample as the cathode, nickel sulfate solution as the electroplating solution (concentration is 200g / L), pH value is 5, in When the current intensity is 80mA, electroplating for 5 minutes, soaking in deionized water, cleaning, and drying at a temperature of 100°C for 6 hours, deposit silicon carbide in a chemical vapor deposition furnace, and control the deposition gas source Trichloromethylsilane (MTS) , carrier gas hydrogen (H 2 ) and dilute argon (Ar) at a flow ratio of about 1:3:4, the deposition temperature is 1273K, the furnace pressure is 30Pa, the deposition time is 2 hours, and the furnace is cooled with the furnace. The needle-punched integral carbon felt after electroplating nickel and chemical vapor deposition was taken for SEM microscopic appearance observation, the accelerating voltage was 30KV, and the microsco...

Embodiment 2

[0019] Soak the whole needle-punched carbon felt with acetone for 24 hours, repeatedly soak and clean it with deionized water, and after drying, use this sample as the cathode, cobalt sulfate solution (concentration is 160g / L) as the electroplating solution, and the pH value is 3. When the current intensity is 120mA, electroplating for 10 minutes, soaking in deionized water, cleaning, and drying at a temperature of 120°C for 2 hours, deposit silicon carbide in a chemical vapor deposition furnace, and control the deposition gas source Trichloromethylsilane (MTS) , carrier gas hydrogen (H 2 ) and dilute argon (Ar) at a flow ratio of about 1:2:3, the deposition temperature is 1373K, the furnace pressure is 20Pa, the deposition time is 1 hour, and it is released after cooling with the furnace.

Embodiment 3

[0021] The needle-punched whole carbon felt was repeatedly soaked and cleaned with deionized water (that is, without degumming), and after drying, it was washed with SnCl 2 (15g / L) and hydrochloric acid (30ml / L) mixture as a sensitizer, sensitized at room temperature for 2 minutes, soaked in deionized water repeatedly and washed in PdCl 2 (0.4g / L) and hydrochloric acid (8ml / L) mixed solution for activation for 6 minutes, after repeated immersion and cleaning in deionized water, in CoSO 4 (8~12g / L), NaH 2 PO 2 (23g / L), NaC 2 h 3 o 2 (20g / L), Na 3 C 6 h 5 o 7 (25g / L) and PdNO 3 (6mg / L) mixed solution, controlled temperature is 80 ℃, pH value is 4 when electroless plating 2 minutes, deionized water soaking, cleaning, after drying at 110 ℃ for 4 hours, deposited in chemical vapor deposition furnace Silicon carbide, controlled deposition gas source trichloromethylsilane (MTS), carrier gas hydrogen (H 2 ) and dilute argon (Ar) at a flow ratio of 1:2:4, the deposition temp...

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Abstract

The invention discloses a method for preparing silicon carbide nano-fiber or carbon fiber composite felt, which comprises following steps: eliminating adhesion of needle integrated carbon felt or not eliminating the adhesion, then, absorbing one of transition group cobalt or nickel on the surface of carbon felt fiber in a mode of fine grained shapes through adopting a method of electroplating or electroless plating, drying, then, depositing silicon carbide in a chemical vapor deposition furnace, controlling the flow capacity of deposition gas source trichloromethylsilanes, carrier gas hydrogen and diluted argon, keeping the furnace pressure to be 20-500Pa when the deposition temperature is 1073-1373K, keeping the depositing time to be 1 to 15 hours, cooling along the furnace, then, taking out of the furnace, and obtaining the composite felt whose carbon felt fiber surface is grown with nanometer silicon carbide fiber. The composite felt which is weaved through adopting the method sufficiently exerts the mechanical and physical properties of each direction in situ growing nano-sic fiber and takes the mechanical and physical properties as an enhanced body of traditional C/C or C/SiC composite materials, the anisotropy of the composite materials is increased, and the using performance is increased.

Description

technical field [0001] The invention relates to a method for preparing a felt body, in particular to a method for preparing a silicon carbide nanofiber / carbon fiber composite felt body. Background technique [0002] Carbon fibers have extremely high specific strength and specific modulus, excellent electrical and thermal conductivity, corrosion resistance, and good high temperature resistance in reducing atmospheres, and are widely used as reinforcing (toughening) phases of composite materials. However, in traditional C / C or C / SiC composites, no matter whether the carbon fiber in the felt is woven in 3D or 4D, its strength, toughness, electrical conductivity, thermal conductivity and other mechanical or physical properties have great anisotropy. Silicon carbide nanofibers (SiC-NF) have superior mechanical, thermal and electrical properties and high physical and chemical stability, and can also be used as a reinforcing phase for composite materials such as plastics, metals, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12
Inventor 徐先锋肖鹏许林熊翔黄伯云
Owner CENT SOUTH UNIV
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