Preparation method of silicon nitride-based composite material with network structure

The invention relates to a preparation method of a silicon nitride-based composite material with a network structure, the silicon nitride-based composite material takes silicon nitride with a spherical structure as a matrix, and titanium carbide and a sintering aid are used as a network continuous layer to coat the surface of the silicon nitride, so that the silicon nitride-based composite material is connected into the network structure in a three-dimensional space. The spherical silicon nitride powder is obtained by spray drying and presintering, and the network continuous layer slurry is obtained by dissolving titanium carbide and a sintering aid in an organic aid after wet ball milling. And slowly adding spherical silicon nitride powder into the network continuous layer slurry, continuously stirring to obtain mixed powder slurry with a coating structure, and then pre-pressing, drying, sintering, cooling and demolding to obtain the silicon nitride-based composite material with the network structure. The me