Preparation method of ceramic powder material applying in precinct laser sintering for quick formation
A selective laser sintering and ceramic powder technology, which is applied in the field of laser rapid prototyping, can solve the problems of large amount of surface peritoneum, easy cracking, deformation, etc., and achieve high molding quality, easy removal, and good performance.
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Embodiment 1
[0019] Embodiment 1: Put the aqueous solution containing emulsifier and buffer into a three-necked flask equipped with a mechanical stirrer, feed nitrogen, and add α-methylstyrene, methacrylic acid and polymerization inhibitor after 15 minutes. Mix well under stirring. The initiator was then added and removed after 1 hour of reaction. The entire reaction system was placed in a water bath at a constant temperature of 70°C.
[0020] Table 1 Substances used and their dosage
[0021] solvent
[0022] Al with particle size ≤0.125mm 2 o 3 After the powder was filtered and washed with dilute sodium carbonate solution and distilled water, the obtained Al 2 o 3 Add a small amount of water to the beaker and mix the powder and the copolymer at a mass ratio of 9:0.5, then put it in an oven at 140°C, bake it in the air for more than twelve hours, and then take it out.
Embodiment 2
[0023] Embodiment 2: Put the aqueous solution containing emulsifier and buffer into a three-necked flask equipped with a mechanical stirrer, feed nitrogen, add methyl methacrylate, butyl methacrylate and polymerization inhibitor after 15 minutes. Mix well under stirring. The initiator was then added and removed after 30 minutes of reaction. The whole reaction system was placed in a water bath with a constant temperature of 50°C.
[0024] Table 2 Substances used and their dosage
[0025] solvent
[0026] The particle size ≤ 0.125mmSi 3 N 4 After the powder was filtered and washed with dilute sodium carbonate solution and distilled water, the Si 3 N 4 Add 2g of copolymer to every 20g of powder, mix mechanically, and dry at a temperature higher than 100°C.
Embodiment 3
[0027] Example 3: Put the aqueous solution containing emulsifier and buffering agent into a three-necked flask equipped with a mechanical stirrer, feed nitrogen, and add methacrylic anhydride, vinyl methyl ether and polymerization inhibitor after 15 minutes. Mix well under stirring. The initiator was then added and removed after 2 hours of reaction. The whole reaction system is in a water bath with a constant temperature of 90°C.
[0028] Table 3 Substances used and their dosage
[0029] solvent
[0030] The particle size ≤ 0.125mmSi 3 N 4 The powder was filtered and washed with dilute sodium carbonate solution and distilled water, and then dried to obtain Si 3 N 4The powder and the freshly prepared copolymer are coated with a mass ratio of 9:1 and spray-dried.
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