US2016168666A1PendingUtilityA1

Flame-retardant magnesium alloy and method of manufacturing same

63
Assignee: UNIV KUMAMOTO NAT UNIV CORPPriority: Apr 15, 2013Filed: Apr 14, 2014Published: Jun 16, 2016
Est. expiryApr 15, 2033(~6.7 yrs left)· nominal 20-yr term from priority
Inventors:Yoshihito KawamuraJonghyun Kim
B22D 21/007C22C 23/06C22C 23/04B22D 21/04B22D 27/04C22C 1/02
63
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Claims

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)

Claims

exact text as granted — not AI-modified
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 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)
 
   
     
     
         25 . 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 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)
 
   
     
     
         26 . The flame-retardant magnesium alloy according to  claim 17 ,
 wherein said 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)
 
   
     
     
         27 . 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 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)
 
   
     
     
         28 . The flame-retardant magnesium alloy according to  claim 17 ,
 wherein said 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)
 
   
     
     
         29 . The flame-retardant magnesium alloy according to  claim 17 ,
 wherein said 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.   
     
     
         30 . The flame-retardant magnesium alloy according to  claim 17 ,
 wherein said alloy is a cast.

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