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A kind of tungsten carbide reinforced carbon-based composite material and its preparation method

A carbon-based composite material and composite material technology, which is applied in the field of tungsten carbide reinforced carbon-based composite materials and its preparation, can solve the problems of poor anti-oxidation and ablation resistance, low mechanical properties, uneven microstructure, etc., and reduce sintering Effects of temperature, enhanced mechanical strength, and enhanced bond strength

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of tungsten carbide reinforced carbon-based composite material and preparation method and preparation method, and this method is easy to operate, can effectively overcome the microstructure of ceramic reinforced graphite composite material by this method Problems of uniformity, low mechanical properties, and poor anti-oxidation and anti-ablation properties

Method used

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  • A kind of tungsten carbide reinforced carbon-based composite material and its preparation method
  • A kind of tungsten carbide reinforced carbon-based composite material and its preparation method
  • A kind of tungsten carbide reinforced carbon-based composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh tungsten oxide and mesophase carbon microspheres with a molar ratio of 1:40 as raw material powder, and 1:1 sodium chloride and potassium chloride as medium, wherein the mass ratio of raw material powder and medium is 1:7, and the powder is in Mechanically stir in an agate mortar for 20 minutes to mix well. Put the mixed powder into an alumina crucible, under vacuum or protective atmosphere, raise the temperature of the mixed powder to 600°C at a rate of 10°C / min, keep it warm for 30 minutes; then raise the temperature to 1100°C at a rate of 5°C / min , keep warm for 1 hour, rinse with hot water at 80-100°C for 30-50 times, and dry to obtain tungsten carbide-coated mesophase carbon microsphere powder. Take part of the composite powder and put it into a carbon mold. The upper and lower pressure heads and the inner wall of the mold are pre-laid with a layer of carbon paper, which is pre-pressed to form a sample, and then the carbon mold is placed in the figure 1 spa...

Embodiment 2

[0038] The process of this example is the same as that of Example 1, except that some process parameters are changed: the holding time in vacuum atmosphere is 2.5 hours, and the final sintering temperature is 1800°C.

[0039] Carry out the performance test identical with embodiment 1 to the sintered sample of present embodiment, the result is as follows: density reaches 3.87g / cm 3 , the relative density reaches 94.45%, and the apparent porosity is 2.98%. Form a three-dimensional network ceramic skeleton and image 3 Similar; microstructure and figure 2 Similar; the flexural strength of the composite material reaches 124MPa.

Embodiment 3

[0041] The process of this embodiment is the same as that of Example 1, except that some process parameters are changed: the holding time in vacuum atmosphere is 5 hours, and the final sintering temperature is 1850°C.

[0042] The same performance test as in Example 1 is carried out on the sintered sample of this embodiment, and the results are as follows: the density reaches 3.98g / cm 3 , the relative density reaches 95.95%, and the apparent porosity is 2.74%. Form a three-dimensional network ceramic skeleton and image 3 Similar; microstructure and figure 2 Similar; the flexural strength of the composite material is 182MPa.

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Abstract

The invention discloses a tungsten carbide reinforced carbon matrix composite material and a preparation method. Mesocarbon microbeads are adopted as the matrix, and tungsten carbide ceramic is adopted as the reinforcement phase and is evenly distributed among the carbon microbeads so as to form a three-dimensional network tungsten carbide skeleton reinforced isotropic structure. The preparation method includes: firstly taking tungsten oxide particles and mesocarbon microbeads as the raw materials to prepare uniform and thickness controllable tungsten carbide coating coated mesocarbon microbead powder by molten salt process, then performing pre-press molding, and conducting discharge plasma sintering at 1500-1900DEG C to form a uniform three-dimensional network tungsten carbide ceramic skeleton, which can significantly improve the strength, ablation resistance and oxidation resistance of the carbon matrix, thus forming the isotropic carbon matrix composite material characterized by lowcost, low density and excellent mechanical properties, sintering performance and ablation resistance. Because of the excellent comprehensive performance, the tungsten carbide reinforced carbon matrixcomposite material can be widely applied to aerospace, national defense and other fields, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a tungsten carbide reinforced carbon-based composite material and a preparation method. Background technique [0002] The nozzle of the solid rocket motor effectively converts the gas energy generated in the combustion chamber into kinetic energy by controlling the expansion of the exhaust gas, thereby providing thrust to the aircraft. The throat liner is located at the throat of the nozzle, and its function is to limit the increase of the throat area caused by ablation, and then the thrust drop caused by it. When the high-energy propellant containing metal powder (such as aluminum, magnesium, lithium powder) in a high-performance engine burns, the high-burning-velocity airflow at around 3000°C carries solid particles or alumina droplets and violently scours the throat liner. If the throat liner is working If the ablation is severe, it will be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/528C04B35/622C04B35/628C04B35/64
Inventor 史忠旗谢文琦张晓钰张哲健魏智磊葛邦治夏鸿雁
Owner XI AN JIAOTONG UNIV
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