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Ceramic matrix composite component with step structure and preparation method thereof

A composite material component and ceramic-based technology, which is applied in the field of ceramic matrix composite material components with a stepped structure and its preparation, can solve the problems of high production cost and high failure rate, so as to increase the bonding force and improve the product qualification rate , the effect of reducing production costs

Active Publication Date: 2021-04-13
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of high failure rate and high production cost caused by delamination, cracks, deformation and fracture at the step joints of ceramic matrix composite components with stepped structures in the prior art, the purpose of the present invention is to provide A ceramic matrix composite material component with a stepped structure and a preparation method thereof, which improve the overall strength of the component and the strength of the junction of the stepped structure, thereby increasing the qualified rate of products and reducing production costs

Method used

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  • Ceramic matrix composite component with step structure and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037]A ceramic matrix composite member with a stepped structure, a fiber prefabricate and a ceramic layer and a ceramic matrix in which the fiber prefabricate is sequentially deposited; including the base portion and a step structure portion disposed on the base portion; the basal The fiber prefabrication portion of the step structure portion is integrally formed; the fiber prefabricate uses 12 k carbon fibers, 0 / 90 ° laborer / mesh-tip-tip-shaped 2.5D prefabricated body, the step structure partial fiber The fiber density of the prefabric is gradually decreasing, and the number of layers of laminateless cloth / nika in the preform step structure is 6: 1, and there is no latitude and nets from the neutral free cloth. The number ratio is gradually reduced to 2: 1; the interface layer is a pyrolytic carbon interface layer; the ceramic substrate of the base portion is silicon carbide; the ceramic substrate of the step structure contains silicon carbide of fibers.

[0038]Preparation metho...

Embodiment 2

[0062]A ceramic matrix composite member with a stepped structure, a fiber prefabricate and a ceramic layer and a ceramic matrix in which the fiber prefabricate is sequentially deposited; including the base portion and a step structure portion disposed on the base portion; the basal The fiber prefabricated portion of the step structure portion is integrated; the fiber prefabricate uses 12 k carbon fibers, and is finely punctured 2.5D prefabricates; the stepped structural portion of the fiber preform is gradually reduced by the outer fibers. Small, internal fine fiber density is 0.70g / cm3External finely labeled fiber density is 0.5g / cm3The interface layer is a pyrolytic carbon interface layer; the ceramic substrate of the base portion is a silicon carbide base; the ceramic substrate of the step structure portion is a silicon carbide base containing nanofibers, and the nanofibers are nanofibers. Quality. The ratio is 1: 1 carbon nanotubes and nano-sic fibers.

[0063]Preparation metho...

Embodiment 3

[0083]A ceramic matrix composite member with a stepped structure, a fiber prefabricate and a ceramic layer and a ceramic matrix in which the fiber prefabricate is sequentially deposited; including the base portion and a step structure portion disposed on the base portion; the basal The fiber prefabricated portion of the step structure portion is integrally formed; the fiber prefabricate uses 12 k silicon carbide fibers, fibrous puncturing 2.5D prefabricates; the fiber density of the step structure partial fiber pre-protected fiber is inside and outside fibers The layout gradually decreases, the internal fiber density is 0.60g / cm3, External fiber density is 0.40g / cm3The interface layer is a pyrolytic carbon interface layer; the ceramic substrate of the base portion is a silicon carbide base which is a silicon carbide substrate containing nanofibers, and the nanofiber is a graphite. Ethylene.

[0084]Preparation method, steps are as follows:

[0085](1) Preparation of fiber prefabricati...

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Abstract

The invention discloses a ceramic matrix composite component with a step structure and a preparation method of the ceramic matrix composite component. The preparation method comprises the following steps: (1) processing a fiber preform according to a designed size; (2) preparing an interface layer; (3) dipping the step structure part of the fiber prefabricated body into resin mixed with fibers, and then drying; (4) repeating the step of dipping, curing and low-temperature cracking on the step structure part for 2-4 times, and dipping the ceramic precursor slurry containing the nanofibers; (5) repeating the whole impregnation, curing and low-temperature cracking for 3-6 times, repeating the impregnation, curing and high-temperature cracking for 1-3 times, and impregnating the ceramic precursor slurry containing the nano ceramic powder; (6) mechanical finish machining; (7) repeating the dipping, curing and low-temperature cracking steps in the step (5) for 2-3 times; (8) repeating the dipping, curing and high-temperature cracking steps in the step (5) for 1-2 times; and (9) depositing the SiC coating layer by a CVD method. The strength of the joint of the step structure can be improved, so that the product percent of pass is increased, and the production cost is reduced.

Description

Technical field[0001]The present invention belongs to the technical field of ceramic matrix composites, and in particular, a ceramic matrix composite material having a step structure and a preparation method thereof.Background technique[0002]The continuous fiber reinforced ceramic matrix composites have excellent properties of ceramic matrix and continuous fibers, with high wear resistance, high temperature resistance, corrosion resistance, radiation resistance, high strength, low density, small thermal expansion coefficient, anti-ablative, anti-oxidation, etc. Excellent performance, as high temperature thermal structural materials, wear-resistant materials, are expected to be applied to aerospace engine, space space station, automotive brake disc, nuclear power and other fields.[0003]With the development of science and technology, the use environment of continuous fiber reinforced ceramic matrix composites is more complex, and the structure of the member of the ceramic matrix compo...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/571
CPCC04B35/571C04B2235/5248C04B2235/3826C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/77C04B2235/96
Inventor 吴恒魏庆渤张东生马美霞曹伟李江涛刘毫豪胡晓辉王琰董会娜
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD