A treatment method for improving the service temperature and performance of silicon carbide fiber

A processing method and fiber technology, which are applied in the field of ceramic matrix composite materials preparation technology, can solve the problems of crystallization and grain growth, limit the application of SiC fibers, and damage the fiber microstructure, and achieve good crystallization and uniform microstructure. dense effect

Active Publication Date: 2011-02-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the amorphous microstructure makes it unstable at high temperature. As the temperature increases, crystallization and grain growth will also destroy t

Method used

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  • A treatment method for improving the service temperature and performance of silicon carbide fiber
  • A treatment method for improving the service temperature and performance of silicon carbide fiber
  • A treatment method for improving the service temperature and performance of silicon carbide fiber

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Example 1

The commercially available common SiC fiber was impregnated in a phenolic resin with a concentration of 20 vol%, and then dried at 70°C. The dried fiber was wound on a graphite cylinder, and heat-treated under the conditions of 1900° C., 200 MPa, and Ar atmosphere for 1 hour. The treated fiber was subjected to cross-sectional component analysis and compared with the untreated original fiber. The results are shown in Figure 2. The oxygen content of the untreated fiber is as high as 21 wt%, while the oxygen content of the treated fiber drops to about 5 wt%.

Example Embodiment

Example 2

The purchased ordinary SiC fiber was wound on a graphite cylinder, and then heat-treated directly at 1900° C., 200 MPa, and Ar atmosphere for 1 hour. The treated fiber was subjected to XRD analysis and microstructure analysis, and compared with the untreated original fiber. The XRD comparison results are shown in Figure 3, and the microstructure analysis results are shown in Figure 4. It can be seen from Figure 3 that the untreated fiber (original fiber) has a typical amorphous structure. After treatment, the fiber showed a typical crystalline structure and contained obvious high-temperature stable α-SiC. It can be seen from Figure 4 that after treatment, the fiber exhibits an obvious microcrystalline structure.

Example Embodiment

Example 3

The commercially available common SiC fiber was impregnated in a furfural resin with a concentration of 30 vol% and then dried at 100°C. Wound on a graphite cylinder, and finally heat-treated at 1650° C., 100 MPa, 2 hours, and Ar atmosphere. The rest is the same as Example 1, and the result is similar to Example 1.

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Abstract

The invention relates to a treatment method for improving the use temperature and performance of SiC fibers, which is characterized in that two treatment methods are used, one of which is to immerse commercially available SiC fibers in a 15-35vol% organic polymer solution and dry After winding on the graphite tube, heat treatment in a high-temperature furnace at 30-200Mpa, 1600-2000°C in an argon atmosphere, so that the carbon formed by the pyrolysis of the organic polymer and the SiO decomposed by the SiC fiber under high temperature and low pressure are in situ Reaction to generate SiC; another method is to directly wind SiC on the graphite cylinder, and use the same heat treatment conditions as described in the first method to make free carbon in the fiber react with SiO in situ to generate SiC. The characteristics of the present invention avoid SiC fiber Degradation at high temperature leads to performance attenuation, and the oxygen content of the SiC fiber drops from 21wt% to 5wt% after being treated by the method provided by the invention.

Description

A treatment method for improving the service temperature and performance of silicon carbide fiber technical field The invention relates to a treatment method for improving the properties of ordinary SiC fibers, increasing their use temperature and performance, more precisely, relates to a treatment process for ordinary SiC fibers to avoid degradation at high temperatures, and belongs to the field of preparation technology of ceramic matrix composite materials. Background technique High-performance silicon carbide ceramics have high strength and high hardness, and the strength can be maintained up to 1600 ° C. It has good oxidation resistance, high thermal conductivity, acid and alkali corrosion resistance, low thermal expansion coefficient and good thermal shock resistance, etc. , Widely used in industry and national defense military industry. By reinforcing SiC ceramics with fibers, the fracture toughness of SiC ceramics can be improved, so that the composite material has...

Claims

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Application Information

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IPC IPC(8): C04B41/46C04B35/565D01F9/08
Inventor 董绍明丁玉生周清江东亮
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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