Preparation method of silicon carbide composite cladding pipe

Abstract

The invention provides a preparation method of a silicon carbide composite cladding pipe. The method comprises the following steps of 1, hanging a high-temperature cracking SiC composite material cladding pipe into a vacuum heating furnace; 2, performing heating a vacuum state within 20 Pa; introducing mixed gas of methyltrichlorosilane, argon and hydrogen; maintaining a certain temperature; starting the deposition; 3, after the deposition is completed, taking out the SiC composite material cladding pipe; repeating the step 1 to the step 2; performing the deposition for many times so as to obtain the silicon carbide composite cladding pipe with the deposition layers in different thicknesses. The gas phase deposition measure is used in the silicon carbide composite cladding material for the first time; the gas phase deposition process method of the silicon carbide composite cladding pipe is designed; through process experiments, the optimum parameter is determined; the obvious silicon carbide products are obtained on the inner and outer surfaces and between inside fibers of the deposed cladding pipe; after the gas phase deposition of the silicon carbide composite cladding pipe, the ceramization phenomenon is obvious; the relative density can reach 85 percent or higher.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel research and manufacture, and in particular relates to the preparation of a silicon carbide composite cladding. Background technique [0002] At present, all commercial reactor fuel claddings are alloys based on zirconium. Although this family of materials has been researched and applied for more than 50 years, the reliability of this type of fuel cladding has been greatly improved. However, with 235 The further increase of U enrichment, or the further increase of the amount of fission products in the fuel due to other changes, requires the development of other materials with better resistance to radiation damage and corrosion. At the same time, it is also required that the degree of performance deterioration of such materials can be further reduced under the conditions of severe accidents. [0003] There are some obvious shortcomings in the design and use of zirconium alloy cladding: the se...

AI Technical Summary

Problems solved by technology

[0003] There are some obvious shortcomings in the design and use of zirconium alloy cladding: the service life of zirconium alloy cladding is affected by the corrosion performance of the material, that is, oxidation in the reactor coolant, especially the absorption of hydrogen