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Carbon fiber reinforced boron carbide composite material and preparation method thereof

A technology of composite materials and carbon fiber, which is applied in the fields of chemical industry and materials, can solve the problems of extremely high sintering process and equipment requirements, difficulty in obtaining large-sized products, and poor mechanical properties, and achieve good designability, fine grains, The effect of simple technical process

Inactive Publication Date: 2010-09-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The commonly used preparation method of boron carbide ceramics is the traditional powder sintering forming method, that is, boron carbide powder is prepared first, then mixed with other additive powders and pressed into shape, and then hot pressed at high temperature or pressureless sintered, which requires extremely high sintering technology and equipment. According to It is reported that sintering at 2300°C under normal pressure can only obtain 80% relative density, and it is prone to abnormal grain growth and surface melting, it is difficult to obtain large-sized products and products with complex shapes such as curved surfaces, and the mechanical properties are not good.
At the same time, boron carbide is a ceramic material with strong covalent bonds, and its toughness is only 2.2MPam 1 / 2 , which greatly limits its application

Method used

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  • Carbon fiber reinforced boron carbide composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] (1) On the x-y surface, non-weft cloth and carbon fiber mesh tires are alternately laminated, with 0° and 90° between adjacent layers, and needle-punched fibers are introduced in the z-direction to form a quasi-three-dimensional structure needle-punched carbon fiber preform, and the density of the preform 0.5g / cm 3 .

[0024] (2) see figure 1 , cut the preform in step (1) into a plate-shaped sample of length (60-200mm)×width (60-200mm)×thickness (10-60mm), weigh it and put it into the deposition furnace, and the furnace is vacuumed to Below 50Pa, heat up to 1100°C at a rate of 10°C / min, and bake at 300°C for 30 minutes. Hydrogen, boron trichloride and propylene gas were fed in a ratio of 10:5:1, and the Ar gas was kept at 200 sccm. During infiltration, the furnace pressure was adjusted at 1000 Pa, and the infiltration time was 30 hours. After shutting down the furnace, take out the sample and weigh it, remove the dense outer skin of the sample, wash and dry it, then...

Embodiment 2

[0027] (1) T300 carbon fiber woven non-weft fabric is used on the x-y surface, and T700 carbon fiber puncture weaving is used in the z direction to form a three-dimensional fine-woven puncture preform with a density of 0.6g / cm 3 .

[0028] (2) Cut the prefabricated body in step (1) into Φ(60-150mm)×30mm disc samples, weigh them and put them in the deposition furnace. The furnace is vacuumed below 50Pa at a speed of 10°C / min. The temperature was raised to 1000°C, and the oven was baked at 300°C for 30 minutes. Hydrogen, boron trichloride and methane gases were fed in a ratio of 10:4:1, and the Ar gas was kept at 200 sccm. During infiltration, the furnace pressure was adjusted at 600 Pa, and the infiltration time was 30 hours. After shutting down the furnace, take out the sample and weigh it, remove the dense outer skin of the sample, wash and dry it, then put it into the furnace to continue to infiltrate and densify, repeat 2-3 times until the overall density of the sample re...

Embodiment 3

[0030] (1) Three-dimensional four-way weaving of T300 carbon fiber is adopted, and the weaving angle is 22° to form a three-dimensional weaving prefabricated body, which is circular in shape and has a prefabricated density of 0.8g / cm 3 .

[0031] (2) Process the preform in step (1) into a circular sample with an outer diameter of Φ90 and a wall thickness of 30mm. After weighing, put it into a deposition furnace. The furnace is vacuumed below 50Pa, and the temperature is raised to 10°C / min. 900°C, and bake at 300°C for 30 minutes. Hydrogen, boron trichloride and propylene gas were fed in a ratio of 10:5:1, and the Ar gas was kept at 200 sccm. During infiltration, the furnace pressure was adjusted at 1000 Pa, and the infiltration time was 30 hours. After shutting down the furnace, take out the sample and weigh it, remove the dense outer skin of the sample, wash and dry it, then put it into the furnace to continue to infiltrate and densify, repeat 2-3 times until the overall de...

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Abstract

The invention relates to a carbon fiber reinforced boron carbide composite material and a preparation method thereof. The preparation method comprises the following steps of: preparing a carbon fiber preform by adopting a needling, puncturing or three-dimensional weaving process; and depositing boron carbide matrix in the porous carbon fiber preform by osmosis to form the compact carbon fiber reinforced boron carbide composite material. Aiming at a certain specific application environment, a boron carbide coat can be deposited on the surface of a sample by adopting the same chemical vapor osmosis process. The carbon fiber reinforced boron carbide-based composite material manufactured by the method has the characteristics of good mechanical property, toughness superior to that of the traditional sintered boron carbide, compact structure, light weight, abrasion resistance and high hardness, and is suitable to be applied to a high-temperature light structural component.

Description

technical field [0001] The invention belongs to the field of chemical industry and materials, and in particular relates to a carbon fiber reinforced boron carbide composite material and a preparation method thereof. Background technique [0002] Boron carbide is a special ceramic with excellent performance, its density is 2.4-2.5g / cm 3 , the melting point is greater than 2400°C, the Vickers hardness is greater than 3000, second only to diamond and cubic boron nitride, and the high-temperature hardness is better than diamond and cubic boron nitride, so it is especially suitable for structural materials such as light high-temperature nozzles and light bulletproof armor part. At the same time, boron carbide is widely used in nuclear shielding parts because of its high neutron absorption cross section. [0003] The commonly used preparation method of boron carbide ceramics is the traditional powder sintering forming method, that is, boron carbide powder is prepared first, then...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/80C04B35/622
Inventor 曾凡浩熊翔
Owner CENT SOUTH UNIV
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