Diamond film and graphite composite material

Abstract

The invention discloses a diamond film and graphite composite material, which is mainly used as a fusion device plasma facing material (PFMs). The diamond film grows on the surface of the graphite, and the diamond film and graphite composite material is formed. The diamond film and graphite composite material which is used as the fusion device plasma facing material (PFMs) has the advantages of small absorption of slow neutrons, good high-temperature strength, high thermal shock resistance, good deceleration performance towards fast neutrons, size stability under irradiation, little impurity content and high bulk density.

Description

technical field [0001] The invention relates to the field of nuclear fusion, in particular to a composite material of diamond film and graphite used as a plasma-facing material (PFMs) of a fusion device. Background technique [0002] At present, the energy used by human society is mainly fossil fuels such as coal, oil, and natural gas. They have a long formation cycle and have limited reserves on the earth, which cannot meet the growing needs of human society. In the past few decades, scientists have done a lot of research on wind power, hydropower, solar power, and nuclear power. Although wind power and solar power have little damage to the environment, the energy density they can provide is low, and it is difficult to completely replace fossil energy, let alone meet further energy requirements in the future. The construction and operation of hydropower are greatly affected by the natural environment and have a great impact on the ecological environment. Nuclear power gen...

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Problems solved by technology

However, the thermal conductivity of the above doped graphite is low, and it cannot be well adapted to the new generation of Tokamak devices

[0012] High thermal conductivity carbon fiber reinforced carbon-carbon composite (CFC), its mechanical strength and thermal conductivity are much higher than that of graphite, and its thermal conductivity can reach more than 300W / (m K) at room temperature, and its thermal expansion coefficient is low, so it is resistant to The thermal shock performance is particularly good, but its high chemical sputtering and radiation sublimation will cause changes in the crystal structure of carbon-based materials under neutron irradiation conditions, resulting in transmutation products (He, H, D, T), and will also cause The shape of CFC is unstable, resulting in a decrease in toughness and a sharp drop in thermal conductivity

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