US 12,303,978 B2
Method of 3D printing
Steven Camilleri, Bayview (AU); Sylvain Laversanne, Coburg (AU); and Andrew Duguid, Dandenong (AU)
Assigned to Effusiontech IP Pty Ltd, Victoria (AU)
Appl. No. 17/292,101
Filed by EFFUSIONTECH IP PTY. LTD., Dandenong (AU)
PCT Filed Oct. 29, 2019, PCT No. PCT/AU2019/051188
§ 371(c)(1), (2) Date May 7, 2021,
PCT Pub. No. WO2020/093087, PCT Pub. Date May 14, 2020.
Claims priority of application No. 2018904238 (AU), filed on Nov. 7, 2018.
Prior Publication US 2021/0394274 A1, Dec. 23, 2021
Int. Cl. B33Y 10/00 (2015.01); B22F 10/25 (2021.01); B22F 12/53 (2021.01); B33Y 30/00 (2015.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01)
CPC B22F 12/53 (2021.01) [B22F 10/25 (2021.01); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); C22C 38/44 (2013.01); C22C 38/46 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of 3D printing an item, comprising the step of:
spraying from a spray nozzle, a spray material comprising a powder entrained in an oxygen comprising carrier gas, wherein the spray nozzle comprises a constricted throat that has:
i. a thermal conductivity of at least 10 W/mk;
ii. a hardness of at least 10 Rockwell C (HRC), wherein the constricted throat comprises between 5% and 30% by volume of:
chromium carbide;
iron carbide;
vanadium carbide; or
any combination of chromium carbide, iron carbide and vanadium carbide; and
iii. a temperature of the constricted throat does not exceed 250° C.