A method of releasing a silicon carbide ceramic part

Abstract

This invention provides a demolding method for silicon carbide ceramic parts, belonging to the field of silicon carbide sintering and molding technology. The invention involves molding silicon carbide powder to obtain a silicon carbide green body; sintering the silicon carbide green body to obtain a silicon carbide sintered green body, the sintering being carried out in a graphite mold; and subjecting the silicon carbide sintered green body to sequential gradient cooling and natural demolding to obtain the silicon carbide ceramic part; the gradient cooling includes sequential high-temperature cooling, medium-temperature cooling, and low-temperature cooling. This invention provides a demolding method for silicon carbide ceramic parts that utilizes the difference in thermal expansion coefficients between graphite and silicon carbide. Through precise temperature control and gradient cooling, the radial shrinkage of the graphite mold is greater than that of the silicon carbide sintered green body, creating a gap between the graphite mold and the silicon carbide sintered green body, achieving non-destructive, automatic, and rapid separation without the need for external mechanical force, thus improving product yield and mold reuse rate.