SiC fiber reinforced and toughened (SiC-BN)m multi-element multilayer self-healing ceramic matrix composite material and preparation method thereof

A composite material and fiber reinforced technology, which is applied in the field of SiC fiber reinforced and toughened (SiC-BN)m multi-layer self-healing ceramic matrix composite materials and preparation, can solve the problems of unfavorable composite mechanical properties and improvement, and achieve The effect of synergistic improvement of mechanical properties and self-healing properties, increasing crack propagation path

Inactive Publication Date: 2021-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

due to B 4 The modulus of C or SiBC is slightly different from that of SiC, and the matrix cracks cannot be deflected between the B-containing self-healing component and SiC under load, which is not conducive to the improvement of the mechanical properties of the composite.

Method used

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  • SiC fiber reinforced and toughened (SiC-BN)m multi-element multilayer self-healing ceramic matrix composite material and preparation method thereof
  • SiC fiber reinforced and toughened (SiC-BN)m multi-element multilayer self-healing ceramic matrix composite material and preparation method thereof
  • SiC fiber reinforced and toughened (SiC-BN)m multi-element multilayer self-healing ceramic matrix composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Put 20 sheets of 16cm×16cm 2 Two-dimensional plain-weave SiC fibers (500 fibers / bundle) were laminated and fixed with graphite fixtures to obtain a two-dimensional SiC fiber preform.

[0047] (2) Hang the fiber prefabricated body on the supporting sample rack of the PyC deposition furnace, so that it is in the center of the isothermal zone in the furnace, and at the same time, pass through propylene (C 3 h 6 ), diluent gas argon (Ar), keep the pressure in the furnace at 2kPa, deposit the PyC interface at 850°C, and the deposition time is 40h, and obtain a SiC fiber preform sample with a thickness of 400nm PyC interface.

[0048] (3) Hang the SiC fiber preform deposited with the PyC interface on the supporting sample holder of the SiC deposition furnace, the preform is located in the center of the isothermal zone in the furnace, and the deposition time is 300h to obtain semi-dense SiC f / SiC composites.

[0049] (4) The semi-dense SiC f / SiC composite material is...

Embodiment 2

[0056] (1) Divide 16cm×16cm 2 2.5D SiC fiber preforms (500 pieces / bundle) were fixed with graphite fixtures to obtain two-dimensional and half SiC fiber preforms.

[0057] (2) Hang the fiber prefabricated body on the supporting sample rack of the PyC deposition furnace, so that it is in the center of the isothermal zone in the furnace, and at the same time, pass through propylene (C 3 h 6 ), diluting gas argon (Ar), keeping the pressure in the furnace at 2kPa, depositing the PyC interface at 870°C for 55h, and obtaining a SiC fiber preform sample with a thickness of 500nm PyC interface.

[0058] (3) Hang the SiC fiber preform deposited with the PyC interface on the supporting sample holder of the SiC deposition furnace, the preform is located in the center of the isothermal zone in the furnace, and the deposition time is 260 h to obtain semi-dense SiC f / SiC composites.

[0059] (4) The semi-dense SiC f / SiC composite material is suspended on the supporting sample rack of...

Embodiment 3

[0063] (1) A 16cm×16cm 3D SiC fiber preform (500 pieces / bundle) was fixed with a graphite fixture to obtain a three-dimensional SiC fiber preform.

[0064] (2) Hang the fiber prefabricated body on the supporting sample rack of the PyC deposition furnace, so that it is in the center of the isothermal zone in the furnace, and at the same time, pass through propylene (C 3 h 6 ), diluting gas argon (Ar), keeping the pressure in the furnace at 2kPa, depositing the PyC interface at 820°C for 30h, and obtaining a SiC fiber preform sample with a thickness of 300nm PyC interface.

[0065] (3) Hang the SiC fiber preform deposited with the PyC interface on the supporting sample holder of the SiC deposition furnace, the preform is located in the center of the isothermal zone in the furnace, and the deposition time is 320 h to obtain semi-dense SiC f / SiC composites.

[0066] (4) The semi-dense SiC f / SiC composite material is suspended on the supporting sample rack of the BN deposition...

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Abstract

The invention relates to a SiC fiber reinforced and toughened (SiC-BN)m multi-element multi-layer self-healing ceramic matrix composite material and a preparation method thereof. The preparation method comprises the steps that firstly, a pyrolytic carbon interface is prepared in a SiC fiber preform, then a certain volume fraction of SiC matrix is introduced, and a semi-compact SiC / SiC composite material is obtained; and SiC and BN matrixes are alternatively deposited in the semi-compact SiC / SiC composite material to form a SiC-BN multi-element multi-layer matrix ((SiC-BN) m), so as to obtain the SiCf / (SiC-BN) m self-healing composite material. The SiC matrix mainly plays a role in bearing, and the BN matrix plays a role in crack deflection and self-healing. On one hand, the crystallinity of the BN determines the oxidation resistance and the crack deflection capacity of the BN, so that the BN with high crystallinity is obtained through process regulation and control, and meanwhile, as an oxygen diffusion path, a matrix crack also has a deep influence on the self-healing performance of the material. Therefore, the core of the invention is to obtain the multi-element multi-layer SiCf / (SiC-BN)m with the target layer thickness ratio and the n value.

Description

technical field [0001] The invention belongs to self-healing ceramic matrix composite materials and methods, and relates to a SiC fiber reinforced and toughened (SiC-BN) m Multi-layer self-healing ceramic matrix composite material and its preparation method, in particular to a SiC fiber prefabricated body (SiC-BN) prepared by chemical vapor deposition / infiltration method (CVD / CVI) m Multi-element multi-layer ceramic matrix, forming SiC fiber reinforced and toughened (SiC-BN) m A method for self-healing ceramic matrix composites. Background technique [0002] High-performance aeroengines are the basis for the development of advanced military and civilian aircraft. SiC fiber reinforced SiC ceramic matrix composites (SiC f / SiC composite material) has a series of advantages such as low density, high specific strength, high specific modulus and good toughness, and has become a key thermal structural material for aero-engines with a thrust-to-weight ratio of more than 10. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/583C04B35/565
CPCC04B35/565C04B35/583C04B2235/3826C04B2235/386C04B2235/422C04B2235/656C04B2235/6567C04B2235/658C04B2235/75
Inventor 成来飞叶昉宋超坤刘永胜张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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