Ceramic matrix composite slender thin-wall pipe fitting preparation method, ceramic matrix composite slender thin-wall pipe fitting based on method and application of pipe fitting

Abstract

The invention relates to a ceramic matrix composite slender thin-wall pipe fitting preparation method, a ceramic matrix composite slender thin-wall pipe fitting based on the method and application of the pipe fitting. The problems that existing methods cannot achieve forming of a Cf / SiC or SiCf / SiC ceramic matrix composite fiber preform with the ultra-long diameter ratio and the ultra-thin wall thickness, and a prepared Cf / SiC or SiCf / SiC ceramic matrix composite cannot meet the out-of-pile and in-pile examination requirements due to the fact that the residual porosity is large are solved. The method comprises the following steps: firstly, preparing a Cf / SiC or SiCf / SiC composite pipe fitting as a middle layer of a target pipe fitting; secondly, dipping a middle layer of the processed ceramic matrix composite thin-walled thin-walled pipe fitting into the SiC whisker slurry, and densifying; then preparing a SiC ceramic inner layer and a SiC ceramic outer layer on the inner wall and the outer wall of the middle layer of the compact ceramic-based composite thin-walled pipe fitting correspondingly; and finally, polishing the inner layer and the outer layer of the prepared pipe fitting. The pipe fitting prepared by the method is relatively high in air tightness, and meets the related examination application requirements of a fuel cladding pipe for a gas cooled reactor and a fuel cladding pipe for a pressurized water reactor.

Description

technical field [0001] The invention provides a ceramic-matrix composite material slender thin-walled pipe fitting and a preparation method thereof, in particular to a three-layer composite structure C f / SiC or SiC f / SiC ceramic matrix composite pipe fittings and its preparation method and application. Background technique [0002] Among various types of nuclear reactors, modular high-temperature gas-cooled reactors have extremely high economic competitiveness in small and medium-sized unit scales because of their good safety, high efficiency, and multi-purpose features. In general, the outlet temperature of the modular high-temperature gas-cooled reactor coolant (such as helium) directly determines the efficiency of the high-temperature gas-cooled reactor. The higher the coolant temperature of the reactor, the higher the power generation efficiency can be obtained. The core type of the modular high-temperature gas-cooled reactor is divided into cylindrical core and pebb...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the inability of existing methods to achieve super aspect ratio and ultra-thin wall thickness Cf / SiC or SiC Formation of f / SiC ceramic matrix composite fiber preforms and Cf / SiC or SiCf / SiC ceramic matrix composites prepared by existing methods due to residual For the problem that the porosity is too large to meet the assessment requirements outside the stack and into the stack, a method for preparing ceramic matrix composite pipe fittings with an ultra-length-to-diameter ratio and ultra-thin wall thickness is provided, and a ceramic matrix composite pipe fitting prepared based on the above method is also provided correspondingly. Slender and thin-walled pipe fittings, meeting the relevant assessment requirements and application requirements for fuel cladding tubes for gas-cooled reactors and fuel cladding tubes for pressurized water reactors

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