Molten salt corrosion resistant high-temperature composite material and reactor core structural part of molten salt reactor

Abstract

The invention discloses a molten salt corrosion resistant high-temperature composite material, and belongs to the technical field of metal based reinforcing materials. The molten salt corrosion resistant high-temperature composite material takes 0.5-1.5wt% of nano silicon carbide particles as a reinforcing body, takes 10-20wt% of molybdenum as an additive and takes the balance of nickel as a metal matrix. The invention further discloses a reactor core structural part of a molten salt reactor. The composite material disclosed by the invention can form strengthening effects such as dispersion strengthening of nano silicon carbide particles, solid solution strengthening of molybdenum atoms as well as precipitation strengthening of trinickel silicon nano-sized precipitates (2-5 nm), so that mechanical strength of the matrix is greatly improved, and the obtained composite material has excellent high-temperature strength characteristic, high-temperature irradiation resistance and fluoride salt corrosion resistance, and is a structural material suitable for the reactor core of the molten salt reactor.

Description

Technical field [0001] The invention relates to a high-temperature composite material resistant to molten salt corrosion, belonging to the technical field of metal-based reinforced materials. Background technique [0002] The molten salt reactor has been selected as one of the fourth-generation nuclear reactor concepts for its high inherent safety, economy, non-stop refueling, and low vapor pressure in the primary circuit. However, the high temperature, strong neutron irradiation, and highly corrosive service environment in the molten salt reactor pose challenges to the alloy structural materials in the reactor. Existing reactor alloy structural materials, such as various iron-based alloys used in light water reactors and high-temperature gas-cooled reactors, cannot meet the requirements of molten salt reactors because iron is not resistant to fluoride molten salt corrosion. Since the early 1950s, the United States has spent a lot of manpower and financial resources to develop s...

AI Technical Summary

Problems solved by technology

There are a large number of small alloy structural parts in the core, including instrument control tubes that can measure neutron energy spectrum, flux rate, temperature, etc. These structural parts play a key role in the safe operation of the reactor and normal power generation, and are not easy to replace

The weak mechanical properties of Hastelloy N cannot meet its long-term use requirements

Thirdly, in terms of design standards, only when the operating temperature of a commercial molten salt reactor reaches about 750°C can it produce good economic benefits in terms of power generation efficiency, and only when it reaches 850°C can it greatly improve power generation efficiency, and can use waste heat for seawater desalination and high-temperature refrigeration. Hydrogen and other joint production, so as to maximize the advantages of high-temperature comprehensive utilization of molten salt reactors, but the poor high-temperature mechanical properties of Hastelloy N also restrict the design and development of high-temperature commercial molten salt reactors

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