| abstract |
The invention relates to a preparation method of ultra-light silicon nitride foam ceramics, comprising the following steps: (1) dispersing silicon nitride particles, a sintering aid and a gelling agent in deionized water, and mixing to obtain a solid content of 45-45 60% silicon nitride slurry; (2) adding a foaming agent to the obtained silicon nitride slurry, pouring it into a mold after foaming treatment, and then curing, demoulding and drying to obtain a silicon nitride foam ceramic A green body, the foaming agent is a composite foaming agent obtained by pre-combining an anionic surfactant and a cationic surfactant; (3) pressureless sintering the obtained silicon nitride foam ceramic green body in a nitrogen atmosphere to obtain Silicon nitride foam ceramic. |