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(BN/SiC)n composite interface-phase coating, coating fiber and preparation method

A technology of coating fibers and interfacial phases, applied in the field of coatings for ceramic matrix composites and its preparation, can solve the problems of material performance degradation, poor oxidation resistance, easy expansion, etc., to improve damage tolerance, increase material toughness, Good toughening effect

Active Publication Date: 2015-08-05
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor oxidation resistance of PyC makes the performance of composites containing PyC coating interfacial phase degrade seriously in high temperature oxidative environment
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, but SiC will form a strong interfacial bond with the mullite fiber, which will cause the cracks in the matrix to easily extend into the fiber during the growth process. Conducive to the play of fiber reinforcement

Method used

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  • (BN/SiC)n composite interface-phase coating, coating fiber and preparation method
  • (BN/SiC)n composite interface-phase coating, coating fiber and preparation method
  • (BN/SiC)n composite interface-phase coating, coating fiber and preparation method

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Embodiment 1

[0036] a kind of like figure 1 The (BN / SiC) between fiber and matrix shown can be used as ceramic matrix composites n Composite interfacial phase coating, the composite interfacial phase coating has a periodic stacked structure, the periodic stacked structure specifically refers to the alternate periodic stacking of BN layers and SiC layers, and the thickness of the BN layer is smaller than the thickness of the SiC layer. In this embodiment, the number of lamination cycles of the periodic lamination structure is 2; the BN layer in the composite interfacial phase coating has an anisotropic turbostratic structure. In this embodiment, the thickness of the first sublayer of BN from the inside to the outside is 30.0nm, the thickness of the first sublayer of SiC is 40.0nm, the thickness of the second sublayer of BN is 20.0nm, and the thickness of the second sublayer of SiC is 60.0nm.

[0037] a kind of like figure 1 The coated fiber of the present invention shown includes a fiber...

Embodiment 2

[0048] A fiber-matrix (BN / SiC) that can be used as a ceramic matrix composite n Composite interfacial phase coating, the composite interfacial phase coating has a periodic stacked structure, the periodic stacked structure specifically refers to the alternate periodic stacking of BN layers and SiC layers, and the thickness of the BN layer is smaller than the thickness of the SiC layer. In this embodiment, the number of lamination cycles of the periodic lamination structure is 4; the BN layer in the composite interfacial phase coating has an anisotropic turbostratic structure. In this embodiment, the thickness of the first sublayer of BN from the inside to the outside is 20.0nm, the thickness of the first sublayer of SiC is 60.0nm, the thickness of the second sublayer of BN is 40.0nm, and the thickness of the second sublayer of SiC is 80.0nm, the thickness of the third sublayer of BN is 20.0nm, the thickness of the third sublayer of SiC is 60.0nm, the thickness of the fourth sub...

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Abstract

The invention discloses a (BN / SiC)n composite interface-phase coating. The (BN / SiC)n composite interface-phase coating has a periodic laminated structure, wherein BN layers and SiC layers are alternatively and periodically overlapped; the thickness of the BN layers is not greater than that of the SiC layer. A coating fiber comprises a fiber substrate and the (BN / SiC)n composite interface-phase coating; the innermost layer closest to the fiber substrate is the NB layer and the outermost layer further away from the fiber substrate is the SiC layer. A preparation method for the coating fiber comprises the steps: cleaning the fiber substrate; putting into a deposition hearth, vacuumizing and filling with inert gases to exchange with air; realizing a preset vacuum degree and a preset temperature; bringing precursors into the reaction by carrier gas in a bubbling manner, maintaining a specified pressure of a reaction system, and alternatively depositing the BN layers and the SiC layers on the fiber substrate through changing a precursor gas source. The product has the advantages of good compatibility, high-temperature resistance, anti-oxidation and good toughening effect.

Description

technical field [0001] The invention relates to the technical field of coatings for ceramic matrix composite materials and their preparation, in particular to a composite interfacial phase coating, coated fiber and a preparation method for ceramic matrix composite materials. Background technique [0002] The high-temperature environment in the preparation process of continuous fiber-reinforced ceramic matrix composites causes strong interfacial bonding between the ceramic fibers and the matrix, thereby reducing the strength of the composites and causing brittle fracture. As an important part of composite materials, more and more researchers are focusing on the fiber-matrix interface of fiber-reinforced ceramic matrix composites, expecting to obtain the strength and Further improvement in toughness. The high-performance ceramic matrix composites reinforced by it can be used in cutting-edge fields such as space shuttles and high-performance engines, and are known as new mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B41/89
Inventor 程海峰李俊生李斌刘海韬周永江童思超张朝阳郑文伟
Owner NAT UNIV OF DEFENSE TECH
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