Ceramic-polymer bicontinuous phase insulating material and preparation method thereof

The invention relates to the technical field of vacuum high-voltage electric insulation, and aims to solve the problems that an existing ceramic insulation material is high in hardness, high in brittleness, large in processing difficulty and low in surface voltage resistance level, and a polymer insulation material is high in outgassing rate and air permeability and cannot meet the surface voltage resistance requirements of most vacuum insulation systems. According to the ceramic-polymer bicontinuous-phase vacuum insulating material, the bulk phase of the insulating material comprises a ceramic phase and a polymer phase, and the ceramic phase is a three-dimensional reticular ceramic skeleton which is prepared through high-temperature sintering and is connected with each other; the polymer phase is of a mutually connected three-dimensional network structure prepared through in-situ polymerization; the ceramic phase and the polymer phase are complementary in a three-dimensional space to form a compact bulk phas