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Coated inorganic fiber toughened max phase ceramic composite material, its preparation method and application

A ceramic composite material, inorganic fiber technology, applied in nuclear reactors, nuclear power generation, climate sustainability, etc., can solve the problems of high brittleness and insufficient reliability

Active Publication Date: 2015-12-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The technical purpose of the present invention is to effectively suppress the interface reaction between the inorganic fiber and the MAX phase ceramics and effectively regulate the matching degree of thermal expansion coefficient and elastic modulus between the two, so as to realize the improvement of the fracture toughness and high temperature resistance of the MAX phase ceramic composite material. Effectively improve, so as to fundamentally solve the problems of high brittleness and insufficient reliability of MAX phase ceramics

Method used

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  • Coated inorganic fiber toughened max phase ceramic composite material, its preparation method and application
  • Coated inorganic fiber toughened max phase ceramic composite material, its preparation method and application
  • Coated inorganic fiber toughened max phase ceramic composite material, its preparation method and application

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Embodiment 1

[0101] In this embodiment, the coated inorganic fiber toughened MAX phase ceramic composite material is MAX phase ceramic material Ti 3 SiC 2 The coated inorganic fiber is the toughening phase, and the coated inorganic fiber accounts for 45% by volume; the coated inorganic fiber is fully dispersed in the matrix; the coated inorganic fiber is coated with C and SiC Bidirectional woven SiC two-dimensional cloth with overlapping coatings formed by overlapping. The total thickness of the coating is 600 nm.

[0102] The preparation of the above-mentioned coated inorganic fiber toughened MAX phase ceramic composite material comprises the following steps:

[0103] (1) The two-way woven SiC two-dimensional cloth was cut, and the overlapping coating formed by overlapping C and SiC was prepared on the fiber surface of the SiC two-dimensional cloth by chemical vapor deposition. The specific process conditions are as follows:

[0104] The carbon source of the C coating is ethylene, the...

Embodiment 2

[0113] In this example, the coated inorganic fiber toughened MAX phase ceramic composite material is MAX phase ceramic material Zr 2 PbC is the matrix, and the coated inorganic fiber is the toughening phase. According to the volume percentage, the coated inorganic fiber accounts for 80%; the coated inorganic fiber is fully dispersed in the matrix; the coated inorganic fiber is coated with C and Two-dimensional woven fabric of C fiber with overlapping coating formed by overlapping TiC. The total thickness of the coating is 800 nm.

[0114] The preparation process of the above-mentioned coated inorganic fiber toughened MAX phase ceramic composite material includes the following steps:

[0115] (1) Cut the C fiber two-dimensional woven fabric, and use the chemical vapor infiltration process to prepare an overlapping coating composed of C and TiC overlapping on the surface of the C fiber two-dimensional woven fabric, and the total number of layers of the coating is 10 layers . ...

Embodiment 3

[0123] In this embodiment, the coated inorganic fiber toughened MAX phase ceramic composite material is MAX phase ceramic material Ti 4 SiC 3 The coated inorganic fiber is the toughening phase, and the coated inorganic fiber accounts for 40% by volume; the coated inorganic fiber is fully dispersed in the matrix; the coated inorganic fiber is coated with C and SiC SiC fibers with overlapping coatings formed by overlapping. The total thickness of the coating is 250 nm.

[0124] The preparation process of the above-mentioned coated inorganic fiber toughened MAX phase ceramic composite material includes the following steps:

[0125] (1) Weigh chopped SiC fibers with a length of 2 mm to 5 mm, and prepare an overlapping coating formed by overlapping C and SiC on the surface of the SiC fibers by chemical formation vapor deposition. The specific process conditions are as follows:

[0126] The carbon source of C is acetylene, the deposition temperature is 950 °C, and the deposition...

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Abstract

The present invention provides a coating inorganic fiber toughened MAX phase ceramic composite material and a preparation method thereof. The composite material adopts a MAX phase ceramic material as a matrix and adopts coating inorganic fibers as a toughening phase, wherein the coating inorganic fiber content is 0.5-90% (by volume), and the coating inorganic fibers are completely dispersed in the matrix and are inorganic fibers with the surface coated with the coating. Compared with the composite material in the prior art, the composite material of the present invention has the following characteristics that: the interface reaction between the inorganic fibers and the MAX phase ceramic can be effectively inhibited, the thermal expansion coefficient and elasticity modulus matching degree between the inorganic fibers and the MAX phase ceramic can be effective regulated, the effective improvement of the fracture toughness and the high temperature resistance of the MAX phase ceramic composite material can be achieved, the problems of high brittleness and insufficient use reliability of the MAX phase ceramic can be fundamentally solved, and the coating inorganic fiber toughened MAX phase ceramic composite material has potential application prospects in the high technology fields of civil use, aviation, aerospace, nuclear industry and the like, and is especially for the fission and fusion reactor nuclear power plant inner wall structure material.

Description

technical field [0001] The invention belongs to the field of ceramic matrix composite materials. It specifically relates to a coated inorganic fiber toughened MAX phase ceramic composite material, its preparation method and application. Background technique [0002] Ternary layered ceramic M n+1 AX n (n=1-6) (referred to as MAX phase, where M is a transition group metal, A is a main group element, X is a C or N element), these MAXs also belong to the hexagonal system, and the space group is P6 3 / mmc. Its crystal structure can be described as M 6 The X octahedron and the A atomic layer are stacked at intervals. M-X is mainly bonded by strong covalent bonds and ionic bonds, while the bond between M-X and A atoms is relatively weak. This unique bonding method makes MAX phase ceramics have some excellent properties of metal and ceramics at the same time, like ceramic materials, it has high strength, high modulus, good high temperature oxidation resistance and chemical sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C13/08C04B35/80C04B35/84C04B35/622G21B1/13
CPCY02E30/10Y02E30/30
Inventor 张军伟胡春峰黄庆李方志
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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