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Preparation method of high-compactness SiCf/SiC cladding composite pipe

A composite pipe and densification technology, which is applied in the field of preparation of silicon carbide ceramic matrix composite materials, can solve the problems of SiC pipe fittings such as difficulty in forming, and achieve the effects of simplifying hot pressing and sintering steps, ensuring circularity, and ensuring structural shape

Inactive Publication Date: 2021-02-19
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of highly densified SiCf / SiC cladding composite pipe, through which not only can obtain SiCf / SiC cladding composite material with high density, but also solve the problem of SiCf / SiC cladding composite pipe. f / Difficulty in forming SiC pipe fittings

Method used

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  • Preparation method of high-compactness SiCf/SiC cladding composite pipe

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Experimental program
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Effect test

Embodiment 1

[0041] A highly densified SiC f The preparation method of / SiC cladding composite pipe comprises the following steps:

[0042] S1: Preparation of low-density SiC f / SiC preform: braiding SiC fibers into tubes in 2D, with C 3 h 6 as the source gas, argon as the diluent gas to deposit the PyC interface layer, the deposition temperature is 1000°C, and the thickness is 200nm; MTS-H 2 -Ar is the reaction source gas, CVI deposition (SiC matrix deposition) is carried out at 1100 ° C and 200 Pa for 16 hours, and the obtained low-density SiC f / SiC preform with a density of 2.02g / cm 3 ;

[0043] S2: Preparation of SiC f / SiC green body: Disperse 10% of sintering aid, 5% of silicon carbide precursor, 40% of binder, 10% of plasticizer, and 35% of nano-SiC powder in organic dispersant, and mix them uniformly by ball milling. The ratio of ball to material is 10:1, and the time is 12h to make NITE-SiC slurry, and the NITE-SiC slurry is diffused into low-density SiC by impregnation f...

Embodiment 2

[0047] A highly densified SiC f The preparation method of / SiC cladding composite pipe comprises the following steps:

[0048] S1: Preparation of low-density SiC f / SiC prefabricated body: SiC fibers are braided into tubes in shallow intersection (2.5D), with C 3 h 6 as the source gas, argon as the diluent gas to deposit the PyC interface layer, the deposition temperature is 1050°C, and the thickness is 400nm; MTS-H 2 -Ar is the reaction source gas, CVI deposition is carried out at 1050°C and 200Pa for 30h, and the obtained low-density SiC f / SiC preform density is 2.11g / cm 3 ;

[0049] S2: Preparation of SiC f / SiC green body: sintering aid 10%, SiO 2 2% micropowder, 3% silicon carbide precursor, 10% binder, 5% plasticizer, and 70% nano-SiC micropowder are dispersed in an organic dispersant, mixed evenly by ball milling, and the ball-to-material ratio is 4:1. The time is 24h to make NITE-SiC slurry, and the NITE-SiC slurry is diffused into low-density SiC by impregnati...

Embodiment 3

[0053] A highly densified SiC f The preparation method of / SiC cladding composite pipe comprises the following steps:

[0054] S1: Low-density SiC f / SiC prefabricated body: SiC fibers are braided into tubes in a winding manner, and the C 3 h 6 as the source gas, argon as the diluent gas to deposit the PyC interface layer, the deposition temperature is 1000°C, and the thickness is 300nm; MTS-H 2 -Ar is the reaction source gas, CVI deposition is carried out at 1100°C and 200Pa for 40h, and the obtained low-density SiC f / SiC preform density is 2.15g / cm 3 ;

[0055] S2: Preparation of SiC f / SiC green body: 10% of sintering aid, 2% of MgO powder, 5% of silicon carbide precursor, 30% of binder, 5% of plasticizer, and 48% of nano-SiC powder are dispersed in organic dispersant, passed Mix evenly by ball milling, the ratio of ball to material is 5:1, and the time is 24h to make NITE-SiC slurry, and diffuse the NITE-SiC slurry into low-density SiC by impregnation f In the por...

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Abstract

The invention discloses a preparation method of a high-compactness SiCf / SiC cladding composite pipe, which comprises the following steps: S1, preparing a low-density SiCf / SiC preform: conducting weaving or winding to form a SiC fiber pipe, and carrying out PyC interface layer deposition and short-time SiC matrix deposition on the fiber surface by a CVI technique to obtain the low-density SiCf / SiCpreform; S2, preparing a SiCf / SiC blank: dispersing nano SiC sintered powder and an organic additive into an organic dispersant to prepare NITE-SiC slurry, diffusing the NITE-SiC slurry into pores ofthe low-density SiCf / SiC preform through infiltration, and conducting drying to obtain the SiCf / SiC blank; S3, conducting heat treatment: carrying out degumming heat treatment on the SiCf / SiC green body under the protection of an inert gas atmosphere; and S4, conducting hot isostatic pressing sintering: subjecting the blank obtained after heat treatment to gas-phase pressure sintering in the inertgas atmosphere, so as to obtain the high-compactness SiCf / SiC cladding composite pipe. By means of the preparation method, the SiCf / SiC cladding composite material with high density can be obtained,and the problem that SiCf / SiC pipe fittings are difficult to form is solved.

Description

technical field [0001] The invention relates to the field of preparation of silicon carbide ceramic-based composite materials, in particular to a preparation method of a high-densification SiCf / SiC cladding composite pipe. Background technique [0002] Silicon carbide fiber reinforced silicon carbide ceramic matrix composites (SiC f / SiC) is an excellent high-temperature ceramic structural material, and its application in cladding design is expected to improve certain operational performances of light-water reactor (LWR) cores. Its high temperature resistance (can operate at 900°C) can increase power by 30%; neutron radiation resistance (can withstand 200dpa) and increased fuel consumption can further extend the refueling cycle; SiC reacts slowly with water at high temperatures, and No hydrogen will be produced, which is beneficial to maintain the structural integrity of the cladding and reduce the risk of hydrogen explosion; especially in the case of a loss of water accide...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/571C04B35/622C04B35/64
CPCC04B35/565C04B35/571C04B35/622C04B35/64C04B2235/6562C04B2235/6567C04B2235/658C04B2235/77
Inventor 李鸣付道贵何宗倍张瑞谦何琨洪晓峰邱绍宇
Owner NUCLEAR POWER INSTITUTE OF CHINA
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