Method of preparing biodegradable Zn—Mg—Bi zinc alloy

Patent metadata

Field	Value
Publication number	US-12203152-B2
Application number	US-202318395215-A
Country	US
Kind code	B2
Filing date	Dec 22, 2023
Priority date	Dec 14, 2021
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A method of preparing biodegradable Zn—Mg—Bi zinc alloy includes: melting magnesium under an inert atmosphere to obtain a magnesium melt; adding bismuth particles to the magnesium melt followed by reaction under stirring and heat preservation treatment to obtain a Mg—Bi alloy melt; allowing the Mg—Bi alloy melt to stand in a furnace; subjecting the Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain Mg-50 wt. % Bi alloy ingot; melting zinc to obtain a zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth followed by heating to a preset temperature, stirring and heat preservation to obtain a Zn—Mg—Bi alloy melt; allowing the Zn—Mg—Bi alloy melt to stand in a furnace followed by refining, slagging-off, casting and demoulding to obtain the biodegradable Zn—Mg—Bi zinc alloy.

First claim

What is claimed is:

1. A method for preparing a biodegradable Zn—Mg—Bi zinc alloy, comprising:
(1) melting magnesium under an inert atmosphere to obtain a magnesium melt; adding bismuth particles to the magnesium melt followed by reaction under stirring and heat preservation treatment to obtain a Mg—Bi alloy melt; allowing the Mg—Bi alloy melt to stand in a furnace; and subjecting the Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain a Mg-50 wt. % Bi alloy ingot; and
(2) melting zinc to obtain a zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth to the zinc melt, followed by heating under stirring, and heat preservation to obtain a Zn—Mg—Bi alloy melt; allowing the Zn—Mg—Bi alloy melt to stand in the furnace; and subjecting the Zn—Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain the biodegradable Zn—Mg—Bi zinc alloy.

2. The method of claim 1 , wherein the Mg—Bi alloy melt is prepared through steps of:
melting the magnesium at 650-700° C. in argon gas in the presence of a covering agent followed by keeping at 650-700° C. for 60-90 min to obtain the magnesium melt; and
adding the bismuth particles to the magnesium melt followed by reaction under stirring at 50-80 rpm and 640-660° C. for 20-30 min and keeping at 640-660° C. for 12-15 min to obtain the Mg—Bi alloy melt.

3. The method of claim 1 , wherein in step (1), the casting is performed at 580-610° C.; and the Mg—Bi alloy melt is allowed to stand in the furnace for 3-5 min.

4. The method of claim 1 , wherein the Zn—Mg—Bi alloy melt is prepared through steps of:
melting the zinc at 420-500° C. in argon gas for 60-90 min to obtain the zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth to the zinc melt followed by stirring at 50-80 rpm and 640-660° C. for 20-30 min and keeping at 640-660° C. for 12-15 min to obtain the Zn—Mg—Bi alloy melt.

5. The method of claim 4 , wherein the Zn—Mg—Bi alloy melt comprises 6-20% by volume of Mg 3 Bi 2 as main strengthening phase; the Mg 3 Bi 2 is produced by reaction of magnesium atoms and bismuth atoms; and a weight ratio of bismuth to magnesium in the Zn—Mg—Bi alloy melt is less than or equal to 2.2.

6. The method of claim 1 , wherein in step (2), the casting is performed at 510-550° C., and a mold used in the demoulding is preheated to 180-200° C.

Assignees

• Univ Xi An Jiaotong
• Shaanxi Zinc Ind Co Ltd

Inventors

• Ma Shengqiang
• Lv Ping
• He Xuebin
• Gao Yimin
• Cui Xudong
• Xing Jiandong
• Meng Xiaoli
• Zhang Jiankang

Classifications

• C22C18/00 Primary

  Alloys based on zinc · CPC title

• C22C13/00

  Alloys based on tin · CPC title

• C22C1/02 Primary

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C22C30/06

  containing zinc · CPC title

• C22C1/03

  using master alloys · CPC title