US 11,938,244 B2
Methods for improving mechanical property and biological stability of magnesium alloy and manufacturing material and applications
Hejie Li, Tangshan (CN); Tianfang Wang, Mountain creek (AU); Xiaosong Liu, Tarragindi (AU); and Guoying Ni, Annerley (AU)
Assigned to Hejie Li, Tangshan (CN)
Appl. No. 17/905,456
Filed by Hejie Li, Tangshan (CN)
PCT Filed Feb. 25, 2021, PCT No. PCT/CN2021/000030
§ 371(c)(1), (2) Date Sep. 1, 2022,
PCT Pub. No. WO2021/174998, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 202010140864.9 (CN), filed on Mar. 3, 2020; and application No. 202010291833.3 (CN), filed on Apr. 14, 2020.
Prior Publication US 2023/0146612 A1, May 11, 2023
Int. Cl. A61L 27/04 (2006.01); A61L 27/34 (2006.01); B24B 27/033 (2006.01); C22F 1/02 (2006.01); C22F 1/06 (2006.01); B05D 3/00 (2006.01); B05D 7/14 (2006.01)
CPC A61L 27/047 (2013.01) [A61L 27/34 (2013.01); B24B 27/033 (2013.01); C22F 1/02 (2013.01); C22F 1/06 (2013.01); A61L 2430/02 (2013.01); B05D 3/002 (2013.01); B05D 7/14 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A heat treatment method for improving the mechanical property and the biofunctional stability of a magnesium alloy, comprising steps of:
(1) fully annealing an original cold-drawn magnesium alloy AZ31 in an interference-free atmosphere;
(2) polishing a surface of the magnesium alloy AZ31 from the step (1) by a waterproof abrasive paper to remove an original oxide layer while maintaining or improving the finish of the surface;
(3) heating the magnesium alloy AZ31 obtained from the step (2) in an interference-free atmosphere created by an inert gas or a vacuum, wherein the magnesium alloy AZ31 is heated to a temperature of 330° C. to 350° C. in the interference-free atmosphere and then the temperature is kept for 3 to 4 hours;
(4) cooling the magnesium alloy AZ31 obtained from the step (3) to room temperature, to obtain an equiaxed crystal structure which is texture-even and isotropic.