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A method for rapid preparation of large-thickness continuous fiber toughened sic matrix composites by sol-gel combined with reactive melt infiltration

A continuous fiber and melt infiltration technology, which is applied in the field of composite material preparation, can solve the problems of long preparation cycle, unsatisfactory uniform structure and components, excellent performance, uneven structure and components, etc., and achieve uniform structure and components , Shorten the preparation cycle and shorten the drying time

Active Publication Date: 2022-08-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this process is used to prepare large-thickness CMC-SiC materials, the preparation cycle will be long, and the structure and composition will be uneven along the thickness direction, which cannot meet the requirements of uniform structure and composition and excellent performance.

Method used

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  • A method for rapid preparation of large-thickness continuous fiber toughened sic matrix composites by sol-gel combined with reactive melt infiltration
  • A method for rapid preparation of large-thickness continuous fiber toughened sic matrix composites by sol-gel combined with reactive melt infiltration
  • A method for rapid preparation of large-thickness continuous fiber toughened sic matrix composites by sol-gel combined with reactive melt infiltration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Proceed as follows:

[0037] Step 1 Fiber Preform Preparation:

[0038] Step 1.1 Weaving continuous fibers to form a fiber braid with certain pore structure characteristics.

[0039] Step 1.2 Prepare an interfacial phase (BN or PyC) in the fiber braid obtained in step 1.1, and the thickness of the interfacial phase is 300-500 nm.

[0040] In step 1.3, a certain volume fraction of SiC matrix is ​​prepared in the continuous fiber preform obtained in step 1.2 by the CVI process, as a protective layer for the interface and fibers. Using trichloromethylsilane (MTS) as the precursor, hydrogen as the carrier gas, argon as the diluent gas, the flow ratio of the three is 1:5~50:2~20, the total pressure is 0.5~5kPa, and the deposition temperature is 873 ~1773K, the deposition time is about 320 hours. Thus, semi-densified CMC-SiC with porosity of 28-36% was obtained for subsequent sol impregnation.

[0041] Step 2 Resin Sol Configuration:

[0042] Step 2.1 Measure 15-40ml of ...

Embodiment 2

[0055] Proceed as follows:

[0056] Step 1 Fiber Preform Preparation:

[0057] Step 1.1 Weaving continuous fibers to form a fiber braid with certain pore structure characteristics.

[0058] Step 1.2 Prepare an interfacial phase (BN or PyC) in the fiber braid obtained in step 1.1, and the thickness of the interfacial phase is 300-500 nm.

[0059] In step 1.3, a certain volume fraction of SiC matrix is ​​prepared in the continuous fiber preform obtained in step 1.2 by the CVI process, as a protective layer for the interface and fibers. Using trichloromethylsilane (MTS) as the precursor, hydrogen as the carrier gas, argon as the diluent gas, the flow ratio of the three is 1:5~50:2~20, the total pressure is 0.5~5kPa, and the deposition temperature is 873 ~1773K, the deposition time is about 320 hours. Thus, semi-densified CMC-SiC with porosity of 28-36% was obtained for subsequent sol impregnation.

[0060] Step 2 Resin Sol Configuration:

[0061] Step 2.1 Measure 15-40ml of ...

Embodiment 3

[0075] Proceed as follows:

[0076] Step 1 Fiber Preform Preparation:

[0077] Step 1.1 Weaving continuous fibers to form a fiber braid with certain pore structure characteristics.

[0078] Step 1.2 Prepare an interfacial phase (BN or PyC) in the fiber braid obtained in step 1.1, and the thickness of the interfacial phase is 300-500 nm.

[0079] In step 1.3, a certain volume fraction of SiC matrix is ​​prepared in the continuous fiber preform obtained in step 1.2 by using the CVI process, as a protective layer for the interface and fibers. Using trichloromethylsilane (MTS) as the precursor, hydrogen as the carrier gas, argon as the diluent gas, the flow ratio of the three is 1:5~50:2~20, the total pressure is 0.5~5kPa, and the deposition temperature is 873 ~1773K, the deposition time is about 320 hours. Thus, semi-densified CMC-SiC with porosity of 28-36% was obtained for subsequent sol impregnation.

[0080] Step 2 Resin Sol Configuration:

[0081] Step 2.1 Measure 15-40ml...

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Abstract

The invention relates to a method for rapidly preparing a large-thickness continuous fiber toughened SiC matrix composite material by sol-gel combined with reactive melt infiltration. Thickness CMC-SiC, then the sol and CMC-SiC were transferred to the gel in a hydrothermal reactor, and the porous large-thickness CMC-SiC containing resorcinol-formaldehyde gel was subsequently cracked in a tube furnace using RMI The densification of continuous fiber toughened SiC matrix composites was completed by the method. The large-thickness continuous fiber toughened SiC matrix composite (CMC‑SiC) rapidly prepared by this method has high density, high mechanical properties and uniform matrix phase structure and composition, which solves the problem of preparing large-thickness continuous fiber toughening in the current RMI process method. SiC matrix composites (CMC‑SiC) have problems of long period, low density, uneven composition and structure along the thickness direction, and high residual silicon or carbon content.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation methods, and relates to a method for rapidly preparing a large-thickness continuous fiber toughened SiC matrix composite material (CMC-SiC) by combining sol-gel (Sol-gel) with reactive melt infiltration (RMI). Background technique [0002] For aerospace hot-end structural components that work in high-temperature corrosive environments (gas, air) and complex stress conditions, materials are required to withstand high temperatures and have a high degree of densification. High-density materials generally have high matrix cracking stress, and the dense oxide layer generated by surface oxidation can effectively prevent oxygen from diffusing into the material to meet the long-term service requirements of the material. [0003] Continuous fiber toughened SiC matrix composites (CMC-SiC) have many advantages such as high temperature resistance, wear resistance, corrosion resistance, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/624
CPCC04B35/80C04B35/565C04B35/624C04B2235/616C04B2235/77C04B2235/96C04B2235/614
Inventor 成来飞郭广达叶昉宋超坤张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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