Connection structure and method for SiCf/SiC composite pipes

Abstract

The invention specifically discloses a connection structure and method for SiCf / SiC composite pipes, belonging to the technical field of connection of composite materials. According to the invention,two SiCf / SiC composite pipes are tightly connected together by uniformly smearing the connection head of a variable-diameter cylindrical structure with a connection agent, and then vacuum sintering and fine grinding are carried out so as to obtain a finished composite connected pipe. The connection structure and method provided by the invention do not change the appearance structure of the composite pipes and have minimum damage to materials; and the finished composite connected pipe prepared in the invention has good antioxidation performance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of composite material connection, and in particular relates to a SiCf / SiC composite material pipe fitting connection structure and method. Background technique [0002] SiC composite materials have the advantages of high temperature resistance, low density, high specific strength, good oxidation resistance, corrosion resistance, and no catastrophic damage. They are high temperature resistant and long-life thermal structural / functional materials with broad application prospects. SiC composite cladding is a new concept cladding. Compared with the traditional zirconium alloy cladding, the fuel cladding made of silicon carbide composite has obvious advantages and is a very promising cladding material. And has achieved the consensus of nuclear material researchers in various countries. [0003] However, due to the limitation of the preparation process of silicon carbide composite thin-walled pipe fittings, it is...

AI Technical Summary

Problems solved by technology

When connecting, it is necessary to fill the metal material between the joint interface. In order to meet the assembly requirements of the intermediate material and the silicon carbide composite material, it is often necessary to process the appearance and size of the silicon carbide composite material component, which will inevitably damage the structure of the composite material. Detachment will occur at 1250°C, which cannot meet the connection requirements of silicon carbide composite materials in the reactor

[0006] The metal material has good ductility through the deformation of the material itself, and the connection of the components can be realized through the compression of the material itself. However, the ductility of the silicon carbide composite pipe fittings is poor, and this connection process cannot be used.

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