Patent ID: 11911826
Assignee: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  Y | IPC B

Claim 0:
1. A method of preparation of a powder for 3D printing, comprising:
1): obtain a raw material powder comprising titanium, 1,000-2,000 PPM oxygen, and a particle size of 200-800 meshes, wherein the raw material powder has an irregular morphology;
2): loading the raw material powder into a jet mill having a fluidized bed jet grinding chamber, three gas inlets each having a nozzle arranged inside the jet mill above the fluidized bed jet grinding chamber at 60-90° included angle between the nozzle and a wall surface of the grinding chamber, and a powder inlet and a powder outlet arranged at a lower end and a upper end of the fluidized bed jet grinding chamber, respectively, and a classifier wheel disposed inside the jet mill and connected to the powder outlet;
3): injecting a grinding gas into the grinding chamber through the three gas inlets, at a pressure of 0.1-10 MPa, grinding the raw material powder for 2 to 60 mins; and discharging the powder for 3D printing, wherein the classifier wheel is operated at a frequency of 0 to 60 Hz,
wherein the raw material powder is a titanium alloy powder, a hydride-dehydride titanium powder, or a mixture thereof, and
the grinding gas is argon or nitrogen.