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Preparation method for short carbon fiber/silicon carbide composites

A technology of chopped carbon fiber and composite material, which is applied in the field of fiber-reinforced composite material preparation, can solve the problems of difficult to widely use composite materials, complex preparation process, high technical difficulty, etc., and achieves high hardness, simple preparation process, and operability. strong effect

Inactive Publication Date: 2013-07-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the research on long carbon fiber reinforced silicon carbide composite materials is very extensive, but the preparation process of long fiber reinforced composite materials is complicated, the technology is difficult and the cost is high, making it difficult for composite materials to be widely used

Method used

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  • Preparation method for short carbon fiber/silicon carbide composites

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. First, heat the heat treatment furnace to 400°C, put 0.5mm chopped carbon fiber in it, keep it warm for 30 minutes, take it out and cool it to room temperature, and then use the coarsening solution consisting of nitric acid, potassium dichromate, hydrogen peroxide and ammonium persulfate to soak After 24 hours of coarsening, wash and dry with deionized water for later use;

[0024] 2. According to 100 parts by mass, weigh 10 parts of chopped carbon fiber, 80 parts of silicon carbide micropowder, and 10 parts of sintering aid into the nylon ball ink tank, add silicon carbide grinding balls according to the ratio of 2:1 ball to material, and add Anhydrous ethanol is used as the dispersion medium, and the total volume of balls, materials and ethanol accounts for 2 / 3 of the volume of the ball mill tank;

[0025] 3. Seal the ball mill pot and place it on a high-energy ball mill for ball milling, the ball milling speed is 300r / min, and the time is 2h;

[0026] 4. After th...

Embodiment 2

[0029] 1. First, heat the heat treatment furnace to 400°C, put 1mm chopped carbon fiber in it, keep it warm for 30 minutes, take it out and cool it to room temperature, and then use the coarsening solution consisting of nitric acid, potassium dichromate, hydrogen peroxide and ammonium persulfate to soak for 24 hours After coarsening, wash and dry with deionized water for later use;

[0030] 2. According to 100 parts by mass, weigh 20 parts of chopped carbon fiber, 70 parts of silicon carbide micropowder, and 10 parts of sintering aid into the nylon ball ink tank, add silicon carbide grinding balls according to the ball-to-material ratio of 3:1, and add Anhydrous ethanol is used as the dispersion medium, and the total volume of balls, materials and ethanol accounts for 2 / 3 of the volume of the ball mill tank;

[0031] 3. Seal the ball mill pot and place it on a high-energy ball mill for ball milling, the ball milling speed is 300r / min, and the time is 2h;

[0032] 4. After the...

Embodiment 3

[0035] 1. First, heat the heat treatment furnace to 400°C, put 2mm chopped carbon fibers in it, keep it warm for 30 minutes, take it out and cool it to room temperature, and then use the coarsening solution consisting of nitric acid, potassium dichromate, hydrogen peroxide and ammonium persulfate to soak for 24 hours After coarsening, wash and dry with deionized water for later use;

[0036] 2. According to 100 parts by mass, weigh 30 parts of chopped carbon fiber, 60 parts of silicon carbide micropowder, and 10 parts of sintering aid into the nylon ball ink tank, add silicon carbide grinding balls according to the ratio of 4:1 ball to material, and add Anhydrous ethanol is used as the dispersion medium, and the total volume of balls, materials and ethanol accounts for 2 / 3 of the volume of the ball mill tank;

[0037] 3. Seal the ball mill pot and place it on a high-energy ball mill for ball milling, the ball milling speed is 300r / min, and the time is 4h;

[0038] 4. After th...

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Abstract

The invention discloses a preparation method for short carbon fiber / silicon carbide composites by means of spark plasma sintering (SPS). The preparation method includes the steps: (1), pre-treating the short carbon fiber by placing the same in a heat-treatment furnace for heat preservation for 30 minutes under the temperature of 400 DEG C prior to soaking and coarsening the short carbon fibers in coarsening liquid composed of nitric acid, potassium dichromate, hydrogen peroxide and ammonium persulfate to be washed with deionized water and dried for standby; (2), placing the short carbon fiber, silicon carbide powder and sintering aids in a ball-milling pot to be ball-milled; (3), drying the materials in the step (2) through rotary evaporation prior to grinding the same to sieve the mixed powder; and (4), placing the mixed powder into a graphite mould and subjecting the mixed powder to the spark plasma sintering. The short carbon fiber / silicon carbide composites prepared by the method are good in performance, and volume content of the short carbon fibers can be controllable; and the short carbon fiber / silicon carbide composites have high specific modulus, high specific strength and excellent toughness, and can hopefully be applied to light weight armor field.

Description

technical field [0001] The invention relates to a method for preparing a chopped carbon fiber / silicon carbide composite material, which belongs to the field of fiber-reinforced composite material preparation, and in particular to a method for preparing a chopped carbon fiber / silicon carbide composite material by spark plasma (SPS) sintering. Background technique [0002] Carbon fiber / silicon carbide composite material is composed of silicon carbide ceramics with low density, high hardness, high strength, high temperature resistance and corrosion resistance and carbon fiber with high specific modulus, good toughness and high tensile strength. High specific strength, high specific modulus and other advantages. Its mechanical properties can be adjusted within a certain range by the content of carbon fiber in the silicon carbide matrix. It has good application prospects in military industry, aerospace and other fields. [0003] At this stage, the research on long carbon fiber ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/622
Inventor 程兴旺何旭道王琪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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