Preparation method for nano-silicon nitride powder for laser sintering 3D printing technology

The invention discloses a preparation method for a nano-silicon nitride powder for the laser sintering 3D printing technology. The preparation method is characterized by comprising the following steps: firstly, using gamma-glycidoxypropyl trimethoxysilane for the pretreatment of nano-silicon nitride powder in an ethanol solvent to obtain pretreated nano-silicon nitride powder; then, adding the following components by mass percentage into a grinding machine to obtain a mixture I: 84%-90% of pretreated nano-silicon nitride powder, 3%-8% of epoxy resin and 0.4%-1.0% of pyromellitic dianhydride, starting the grinding machine, grinding the mixture I at a revolution speed of 300 rpm for 5 min, and then adding 5%-10% of acetone to obtain a mixture II, turning on the grinding machine, grinding the mixture II at a revolution speed of 300 rpm for 30-40 min, and drying the grinded mixture II to obtain the nano-silicon nitride powder for laser sintering 3D printing technology. The nano-silicon nitride powder for the laser sintering 3D printing technology can be molded directly under laser sintering, is simple in preparation process, low in production cost, and easy to realize industrial production, and the condition is easy to control.