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C/(SiC/BN)n compound interface phase coating, coating fiber and preparation method of coating fiber

A coating fiber and interfacial phase technology, which is applied in the field of composite interfacial phase coating and its preparation, can solve the problems of material performance degradation, limited service temperature, performance degradation, etc., and achieve the effect of improving damage tolerance and increasing toughness

Active Publication Date: 2015-07-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PyC coating has a layered crystal structure distributed along the fiber, and has suitable interlayer shear strength and bonding strength, but the oxidation resistance of PyC is poor, so that the composite material containing the interface phase of the PyC coating can be used in high-temperature oxidative environments. severe performance degradation
BN has a layered crystal structure similar to graphite, and the oxidation resistance of BN is better than that of PyC, and it is also a common interface phase coating for ceramic matrix composites; but when the temperature is higher than 850 ° C, BN will be oxidized to form B 2 o 3 , leading to a serious decline in material properties, so the use temperature of composite materials containing BN coating interfacial phase is still limited
The SiC coating has good oxidation resistance and can be used between 800°C and 900°C. However, a strong interfacial bond is formed between SiC and mullite fibers, which causes the cracks in the matrix to easily extend into the fibers during the growth process, which is not conducive to The role of fiber reinforcement

Method used

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  • C/(SiC/BN)n compound interface phase coating, coating fiber and preparation method of coating fiber
  • C/(SiC/BN)n compound interface phase coating, coating fiber and preparation method of coating fiber
  • C/(SiC/BN)n compound interface phase coating, coating fiber and preparation method of coating fiber

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Embodiment 1

[0031] Such as figure 1 , figure 2 , image 3 As shown, the C / (SiC / BN) between a silicon carbide fiber and a matrix that can be used as a ceramic matrix composite material of the present invention n Composite interfacial phase coating, the composite interfacial phase coating has a periodic stacked structure, the periodic stacked structure specifically refers to the alternating periodic stacking of SiC layers and BN layers, the stacked layers of periodic stacking in this embodiment The number of cycles is 3 times. Specifically, the thickness of the C layer from the inside to the outside is 20.0nm, the thickness of the first sublayer of SiC is 25.0nm, the thickness of the first sublayer of BN is 25.0nm, the thickness of the second sublayer of SiC is 8.0nm, and the thickness of the first sublayer of BN is 8.0nm. The thickness of the second sublayer is 20.0nm, the thickness of the third sublayer of SiC is 20.0nm, and the thickness of the third sublayer of BN is 50.0nm.

[003...

Embodiment 2

[0044] A kind of C / (SiC / BN) between silicon carbide fiber and matrix that can be used as ceramic matrix composite material of the present invention n Composite interfacial phase coating, the composite interfacial phase coating has a periodic stacked structure, the periodic stacked structure specifically refers to the alternating periodic stacking of SiC layers and BN layers, the stacked layers of periodic stacking in this embodiment The number of cycles is 5 times. Specifically, the thickness of the C layer from the inside to the outside is 15.0nm, the thickness of the first sublayer of SiC is 8.0nm, the thickness of the first sublayer of BN is 20.0nm, the thickness of the second sublayer of SiC is 18.0nm, and the thickness of the first sublayer of BN is 18.0nm. The thickness of the second sublayer is 25.0nm, the thickness of the third sublayer of SiC is 25.0nm, the thickness of the third sublayer of BN is 50.0nm, the thickness of the fourth sublayer of SiC is 25.0nm, and the ...

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Abstract

The invention discloses a C / (SiC / BN)n compound interface phase coating which comprises a C layer and a periodic superposed layer, wherein the periodic superposed layer refers to alternative periodic superposition of SiC layers and BN layers. The coating fiber comprises a fiber base body and the C / (SiC / BN)n compound interface phase coating applied to the surface of the base body, wherein the fiber base body is selected from one of mullite fiber, carbon fiber, silicon carbide fiber and quartz fiber. The preparation method of the coating fiber comprises the following steps: preparing a fiber base body material, and depositing the C layer on the surface of the fiber base body with a chemical vapor deposition method at first; then alternatively depositing the SiC layers and the BN layers on the surface of the C layer with the chemical vapor deposition method, repeating the alternative depositing process 3-5 times, and obtaining the coating fiber. The coating fiber has the advantages of good physical and chemical compatibility, high temperature resistance, oxidation resistance, good toughening effect and the like.

Description

technical field [0001] The invention belongs to the technical field of interface phase coating of ceramic matrix composite material and its preparation, in particular relates to a composite interface phase coating and a preparation method thereof. Background technique [0002] Polycrystalline ceramic fibers have the characteristics of high specific strength, high specific modulus, high temperature resistance, oxidation resistance, and chemical corrosion resistance, and can be used as high-performance composite phases for polymer-based, metal-based and ceramic-based composite materials. Fiber-reinforced high-performance ceramic matrix composites can be used in cutting-edge fields such as space shuttles and high-performance engines, and are known as new materials for aviation, aerospace and high-tech applications in the 21st century. The performance of ceramic matrix composites not only depends on the performance of ceramic fibers and ceramic matrix itself, but more importantl...

Claims

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Application Information

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IPC IPC(8): C04B41/89
Inventor 李俊生程海峰周永江刘海韬童思超张朝阳郑文伟
Owner NAT UNIV OF DEFENSE TECH
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