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Flame-retardant magnesium alloy and method of manufacturing same

a technology of flame-retardant magnesium alloy and manufacturing method, which is applied in the field of flame-retardant magnesium alloy and a manufacturing method, can solve the problems of increasing the cost and dangerous to perform the melting and casting in the air

Inactive Publication Date: 2016-06-16
NAT UNIV CORP KUMAMOTO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a flame-retardant magnesium alloy with good mechanical properties and a high ignition temperature of 800°C or higher. The method of manufacturing this alloy is also provided.

Problems solved by technology

The melting and casting temperature of this long period stacking ordered magnesium alloy is 750° C. Since this temperature is close to an ignition temperature, it is dangerous to perform the melting and casting in the air.
This increases the cost.

Method used

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  • Flame-retardant magnesium alloy and method of manufacturing same
  • Flame-retardant magnesium alloy and method of manufacturing same
  • Flame-retardant magnesium alloy and method of manufacturing same

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first embodiment

[0083]A method of manufacturing a flame-retardant magnesium alloy according to an aspect of the present invention will be described.

[0084]An alloy which contains a atomic % of Zn, b atomic % of Y and x atomic % of Ca and in which the remaining part is formed of Mg, and a, b and x satisfy formulae 1 to 4 below is melted and cast at a temperature of 800° C. or less (preferably 850° C. or less). Since this alloy has an ignition temperature of 800° C. or more (preferably 850° C. or more) by containing Ca. In this way, a magnesium alloy cast is made. The cooling rate at the time of casting is 1000K / second or less, and is more preferably 100K / second or less.

0.5≦a<5.0  (Formula 1)

0.5b<5.0  (Formula 2)

⅔a−⅚≦b  (Formula 3)

0x≦0.5 (preferably, 0.1≦x≦0.5 and further preferably, 0.15≦x≦0.5)  (Formula 4)

[0085]Various processes can be used as the process for producing the magnesium alloy cast described above, and for example, high-pressure casting, roll casting, inclined plate casting, contin...

second embodiment

[0120]A method of manufacturing a flame-retardant magnesium alloy according to one aspect of the present invention will be described. Note that, in the method of manufacturing a flame-retardant magnesium alloy according to the second embodiment, the description of the same parts as in the method of manufacturing a flame-retardant magnesium alloy according to the first embodiment will be omitted as much as possible.

[0121]An alloy which contains a atomic % of Zn, b atomic % of Y and x atomic % of Ca and in which the remaining part is formed of Mg and a, b and x satisfy formulae 1 to 4 below is melted and cast at a temperature of 800° C. or less (preferably 850° C. or less). Since this alloy has an ignition temperature of 800° C. or more (preferably 850° C. or more) by containing Ca. In this way, a magnesium alloy cast is formed. As the magnesium alloy cast, a product cut into a predetermined shape from an ingot is used.

0.25≦a≦5.0  (Formula 1)

0.5≦b≦5.0  (Formula 2)

0.5a≦b  (Formula 3)

0x...

third embodiment

[0139]A method of manufacturing a flame-retardant magnesium alloy according to one aspect of the present invention will be described. Note that, in the method of manufacturing a flame-retardant magnesium alloy according to the third embodiment, the description of the same parts as in the method of manufacturing a flame-retardant magnesium alloy according to the first embodiment will be omitted as much as possible.

[0140]A flame-retardant magnesium alloy which contains a atomic % of Zn, in total, 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 at a temperature of 800° C. or less (preferably, 850° C. or less) and cast. This alloy has an ignition temperature of 800° C. or more (preferably 850° C. or more) by containing Ca. In this way, a magnesium alloy cast is made. The cooling rate at the time of casting is 1000K / second or ...

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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) 0.5a−0.5≦̸b  (Formula 3) 0<x≦̸0.5  (Formula 4)

Description

TECHNICAL FIELD[0001]The present invention relates to a flame-retardant magnesium alloy and a method of manufacturing the same.BACKGROUND ART[0002]A conventional long period stacking ordered (LPSO) magnesium alloy (refer to, for example, patent literatures 1 to 3) has mechanical properties of high strength and high ductility. The melting and casting temperature of this long period stacking ordered magnesium alloy is 750° C. Since this temperature is close to an ignition temperature, it is dangerous to perform the melting and casting in the air. Therefore, in performing the melting and casting, there has been a necessity of performing an operation thereof under an atmosphere (for example, under an atmosphere of vacuum and an inert gas) in which the combustion of the magnesium alloy is prevented. This increases the cost. In particular, since SF6 that is used as an inert gas has 23,900 times as high global warming potential as carbon dioxide, SF6 is harmful to the environment, and thus...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C23/06B22D21/04B22D21/00C22C1/02
CPCC22C23/06B22D21/007B22D21/04C22C1/02B22D27/04C22C23/04
Inventor KAWAMURA, YOSHIHITOKIM, JONGHYUN
Owner NAT UNIV CORP KUMAMOTO UNIV