Fiber reinforcement and preparation method thereof
A fiber reinforcement and fiber weaving technology, which is applied in the field of fiber in-situ growth of multi-level SiC nanowire reinforcement and its preparation, can solve the problems of inability to microcrack branching, catastrophic failure of materials, and difficulty in size control. The effect of easy control of growth, simple preparation process and high safety
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[0043] Example 1
[0044] This example is to show the structure and morphology of multi-level SiC nanowire reinforcement prepared by the "secondary catalyst method";
[0045] The carbon fiber braid is vacuum immersed in Ni(NO) with a concentration of 0.02mol / L 3 ) 2 In the acetone solution for 2h, remove and dry. Put the dry catalyst-carrying carbon fiber braid into a chemical vapor deposition equipment, heat up to 700°C in an argon atmosphere, stop the argon, and pass H 2 Ni(NO 3 ) 2 Reduced to Ni metal particles. Stop H 2 Pass in and continue to heat up to 1100°C with argon. Turn off the argon gas and pass in methyl trichlorosilane (MTS) and H 2 , MTS / H 2 The mole fraction ratio is 0.1, the furnace pressure is 3KPa, and the reaction time is 0.5h. After the reaction is completed, the gas is turned off and cooled to room temperature under an argon atmosphere to obtain a first-level SiC nanowire reinforcement. The obtained reinforcement is washed with ethanol and dried, and the a...
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[0047] Example 2
[0048] This example is to demonstrate the structure and morphology of multi-level SiC nanowire reinforcement prepared by the "pressure adjustment method";
[0049] The silicon carbide fiber braid is vacuum immersed in a concentration of 0.01 Fe(NO 3 ) 3 In ethanol solution for 4h. Put the dried catalyst-supporting silicon carbide fiber braid into a chemical vapor deposition equipment, and heat to 1000°C under a nitrogen atmosphere, and pass H 2 Fe(NO 3 ) 3 Reduced to Fe metal particles. Stop ventilation and pass in methyl trichlorosilane (MTS) and H 2 , And MTS / H 2 The mole fraction ratio is 0.2, the furnace pressure is 5KPa, after the reaction is carried out for 40 minutes, the furnace pressure is changed to 100KPa, and the reaction is continued for 30 minutes. After the reaction, the gas is turned off and cooled to room temperature under the protection of a nitrogen atmosphere to obtain a multi-level SiC nanowire reinforcement, such as image 3 Shown.
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