Flame-retardant magnesium alloy and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-2016168666-A1
Application number	US-201414784095-A
Country	US
Kind code	A1
Filing date	Apr 14, 2014
Priority date	Apr 15, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A method of manufacturing a flame-retardant magnesium alloy having mechanical properties of a long period stacking ordered magnesium alloy and having an ignition temperature of 800° C. or more is provided. In the method of manufacturing a flame-retardant magnesium alloy, a flame-retardant magnesium alloy which contains a atomic % of Zn, b atomic % of at least one element selected from a group consisting of Gd, Tb, Tm and Lu, and x atomic % of Ca and in which a remaining part is formed of Mg and a, b and x satisfy Formulae 1 to 4 below is melted.
0.2≦ a ≦5.0  (Formula 1)

0.5≦ b ≦5.0  (Formula 2)

0.5 a −0.5≦ b   (Formula 3)

0< x ≦0.5  (Formula 4)

First claim

1 . A method of manufacturing a flame-retardant magnesium alloy comprising a step of melting a flame-retardant magnesium alloy which contains a atomic % of Zn, x atomic % of Ca, in total, b atomic % of at least one element selected from a group consisting of Gd, Tb, Tm and Lu, and a residue of Mg, wherein a, b and x satisfy formulae 1 to 4 below,
0.1≦ a≦ 5.0  (Formula 1)
0.25≦ b≦ 5.0  (Formula 2)
0.5 a− 0.5≦ b   (Formula 3)
0< x≦ 0.5.  (Formula 4)

2 . A method of manufacturing a flame-retardant magnesium alloy comprising a step of melting a flame-retardant magnesium alloy which contains a atomic % of Zn, x atomic % of Ca, in total, b atomic % of at least one element selected from a group consisting of Gd, Tb, Tm and Lu, and a residue of Mg, wherein a, b and x satisfy formulae 1 to 4 below,
0.1≦ a≦ 3.0  (Formula 1)
0.25≦ b≦ 5.0  (Formula 2)
2 a− 3≦ b   (Formula 3)
0< x≦ 0.5.  (Formula 4)

3 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein a flame-retardant magnesium alloy in which said a and b satisfy Formulae 1′ and 2′ below is melted,
0.2≦ a≦ 5.0  (Formula 1′)

0.5≦ b≦ 5.0.  (Formula 2′)

4 . The method of manufacturing a flame-retardant magnesium alloy according to claim 2 ,
wherein a flame-retardant magnesium alloy in which said a and b satisfy Formulae 1′ and 2′ below is melted,
0.2≦ a≦ 3.0  (Formula 1′)

0.5≦ b≦ 5.0.  (Formula 2′)

5 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy has an ignition temperature of 800° C. or more.

6 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy is melted at a temperature of 800° C. or less.

7 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy is melted, and then the melted flame-retardant magnesium alloy is cast.

8 . The method of manufacturing a flame-retardant magnesium alloy according to claim 7 ,
wherein a cooling rate in casting said flame-retardant magnesium alloy is 1000K/second or less.

9 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy contains y atomic % of Al, and y satisfies Formula 5 below,
0< y≦ 0.5.  (Formula 5)

10 . The method of manufacturing a flame-retardant magnesium alloy according to claim 3 ,
wherein said flame-retardant magnesium alloy contains, in total, c atomic % of at least one element selected from a group consisting of La, Ce, Pr, Eu and Mm, and c satisfies Formula 6 and Formula 7 below,
0≦ c≦ 2.0  (Formula 6)

0.5≦ b+c≦ 6.0.  (Formula 7)

11 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy contains, in total, c atomic % of at least one element selected from a group consisting of La, Ce, Pr, Eu and Mm, and c satisfies Formula 6 and Formula 7 below,
0≦ c≦ 2.0  (Formula 6)

0.25≦ b+c≦ 6.0.  (Formula 7)

12 . The method of manufacturing a flame-retardant magnesium alloy according to claim 3 ,
wherein said flame-retardant magnesium alloy contains, in total, c atomic % of at least one element selected from a group consisting of Yb, Sm and Nd, and c satisfies Formula 6 and Formula 7 below,
0≦ c≦ 3.0  (Formula 6)

0.5≦ b+c≦ 6.0.  (Formula 7)

13 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy contains, in total, c atomic % of at least one element selected from a group consisting of Yb, Sm and Nd, and c satisfies Formula 6 and Formula 7 below,
0≦ c≦ 3.0  (Formula 6)

0.25≦ b+c≦ 6.0.  (Formula 7)

14 . The method of manufacturing a flame-retardant magnesium alloy according to claim 3 ,
wherein said flame-retardant magnesium alloy contains, in total, c atomic % of at least one element selected from a group consisting of Yb, Sm and Nd, contains, in total, d atomic % of at least one element selected from a group consisting of La, Ce, Pr, Eu and Mm, and c and d satisfy Formulae 6 to 8 below,
0≦ c≦ 3.0  (Formula 6)

0≦ d≦ 2.0  (Formula 7)

0.5≦ b+c+d≦ 6.0.  (Formula 8)

15 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy contains, in total, c atomic % of at least one element selected from a group consisting of Yb, Sm and Nd, contains, in total, d atomic % of at least one element selected from a group consisting of La, Ce, Pr, Eu and Mm, and c and d satisfy Formulae 6 to 8 below,
0≦ c≦ 3.0  (Formula 6)

0≦ d≦ 2.0  (Formula 7)

0.25≦ b+c+d≦ 6.0.  (Formula 8)

16 . The method of manufacturing a flame-retardant magnesium alloy according to claim 1 ,
wherein said flame-retardant magnesium alloy contains, in total, more than 0 atomic % and not more than 2.5 atomic % of at least one element selected from a group consisting of Th, Si, Mn, Zr, Ti, Hf, Nb, Ag, Sr, Sc, B, C, Sn, Au, Ba, Ge, Bi, Ga, In, Ir, Li, Pd, Sb and V.

17 . A flame-retardant magnesium alloy comprising a atomic % of Zn, x atomic % of Ca, in total, b atomic % of at least one element selected from a group consisting of Gd, Tb, Tm and Lu, and a residue of Mg,
wherein a, b and x satisfy Formulae 1 to 4 below, and said alloy comprises a crystalline structure having a long period stacking ordered structural phase,
0.1≦ a≦ 5.0  (Formula 1)

0.25≦ b≦ 5.0  (Formula 2)

0.5 a− 0.5≦ b   (Formula 3)

0< x≦ 0.5.  (Formula 4)

18 . A flame-retardant magnesium alloy comprising a atomic % of Zn, x atomic % of Ca, in total, b atomic % of at least one element selected from a group consisting of Gd, Tb, Tm and Lu, and a residue of Mg,
wherein a, b and x satisfy Formulae 1 to 4 below, and said alloy comprises a crystalline structure having a long period stacking ordered structural phase,
0.1≦ a≦ 3.0  (Formula 1)

0.25≦ b≦ 5.0  (Formula 2)

2 a− 3≦ b   (Formula 3)

0< x≦ 0.5.  (Formula 4)

19 . The flame-retardant magnesium alloy according to claim 17 ,
wherein a flame-retardant magnesium alloy in which said a and b satisfy Formulae 1′ and 2′ below is melted,
0.2≦ a≦ 5.0  (Formula 1′)

0.5≦ b≦ 5.0.  (Formula 2′)

20 . The flame-retardant magnesium alloy according to claim 18 ,
wherein a flame-retardant magnesium alloy in which said a and b satisfy Formulae 1′ and 2′ below is melted,
0.2≦ a≦ 3.0  (Formula 1′)

0.5≦ b≦ 5.0.  (Formula 2′)

21 . The flame-retardant magnesium alloy according to claim 17 ,
wherein said alloy has an ignition temperature of 800° C. or more.

22 . The flame-retardant magnesium alloy according to claim 17 ,
wherein said alloy contains y atomic % of Al, and y satisfies Formula 5 below,
0< y≦ 0.5.  (Formula 5)

23 . The flame-retardant magnesium alloy according to claim 19 ,
wherein said alloy contains, in total, c atomic % of at least one element selected from a group consisting of La, Ce, Pr, Eu and Mm, and c satisfies Formula 6 and Formula 7 below,
0≦ c≦ 2.0  (Formula 6)

0.5≦ b+c≦ 6.0.  (Formula 7)

24 . The flame-retardant magnesium alloy according to claim 17 ,
wherein said alloy contains, in total, c atomic % of at least one element selected fro

Assignees

• Univ Kumamoto Nat Univ Corp

Inventors

• Kawamura Yoshihito
• Kim Jonghyun

Classifications

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• C22C23/06 Primary

  with a rare earth metal as the next major constituent · CPC title

• C22C23/04

  with zinc or cadmium as the next major constituent · CPC title

• B22D21/04

  Casting aluminium or magnesium {(no material; see B22D21/007)} · CPC title

• B22D27/04

  Influencing the temperature of the metal, e.g. by heating or cooling the mould · CPC title