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Flame-retardant and heat-resistant magnesium alloy and preparation method

A magnesium alloy, heat-resistant technology, applied in the field of metal materials and metallurgy, can solve the problems of insufficient strength and elongation, only 2% elongation, only tensile strength, etc. performance, improving high-temperature mechanical properties, and improving the performance of magnesium alloys

Inactive Publication Date: 2015-05-20
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent ZL99113861.9 "Casting flame-retardant magnesium alloy and its melting and casting process" proposes a flame-retardant magnesium alloy containing Al, Sr, Be and rare earth elements. Its ignition temperature can reach 740 ° C, but its mechanical properties Poor, the tensile strength is only 160MPa, the elongation is only 2%, its strength and elongation obviously cannot meet the current industrial use

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  • Flame-retardant and heat-resistant magnesium alloy and preparation method

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Embodiment 1

[0019] A flame-retardant and heat-resistant magnesium alloy, the components and their weight percentages are: 5.3% for Al, 1.2% for Zn, 0.1% for Sm, 0.3% for Nd, 1.2% for Y, 1.4% for Ca, and 1.4% for Sr. 1.1%, the balance is Mg;

[0020] A method for preparing a heat-resistant magnesium alloy as described above, comprising the following steps:

[0021] 1) Weigh pure magnesium, pure aluminum, pure zinc and intermediate alloys Mg-Nd, Mg-Y, Mg-Sm, Mg-Sr, Mg-Ca according to the above weight percentages, and preheat them at 200°C for 2 hours ;

[0022] 2) Put the preheated pure magnesium, pure aluminum and pure zinc in CO 2 +SF 6 Melt under the protection of mixed gas, add Mg-Sm master alloy, Mg-Nd master alloy, Mg-Y master alloy, Mg-Sr master alloy and Mg-Ca master alloy when heated to 720 ° C, keep warm for 10 minutes, until the alloy is completely melted Finally, remove surface scum, raise the temperature to 740°C, stop the temperature rise, then stir evenly, then lower it t...

Embodiment 2

[0025] A flame-retardant and heat-resistant magnesium alloy, the components and their weight percentages are: 6.7% for Al, 0.9% for Zn, 0.4% for Sm, 0.5% for Nd, 0.8% for Y, 0.8% for Ca, and 0.8% for Sr 2.0%, the balance is Mg;

[0026] The preparation method of this embodiment is the same as that of Example 1.

Embodiment 3

[0028] A flame-retardant and heat-resistant magnesium alloy, the components and their weight percentages are: 7.1% for Al, 0.7% for Zn, 0.5% for Sm, 0.8% for Nd, 0.3% for Y, 0.4% for Ca, and 0.4% for Sr. 2.3%, the balance is Mg;

[0029] The preparation method of this embodiment is the same as that of Example 1.

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Abstract

The invention provides a flame-retardant and heat-resistant magnesium alloy and a preparation method, wherein the flame-retardant property and the high-temperature mechanical property of the flame-retardant and heat-resistant magnesium alloy are increased simultaneously; and the flame-retardant and heat-resistant magnesium alloy comprises the following components in percentage by weight: 5-9% of Al, 0.3-1.4% of Zn, 0.1-0.6% of Sm, 0.1-0.8% of Nd, 0.2-1.5% of Y, 0.3-1.7% of Ca, 0.4-2.3% of Sr, and the balance of Mg. By adding proper rare earth elements including Sm, Nd and Y, the magnesium alloy tissue is improved; the flame-retardant property and the heat-resistant property of the alloy are increased; the total addition amount of the rare earth elements in the flame-retardant and heat-resistant magnesium alloy disclosed by the invention is 1-2%; researches show that few alkaline-earth elements including Ca and Sr are capable of obviously increasing the flame-retardant property of the magnesium alloy; furthermore, a high-melting-point strengthening phase is generated in the microscopic structure of the alloy; the microscopic structure of the magnesium alloy is improved; and the high-temperature mechanical property of the magnesium alloy is increased.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, in particular to a flame-retardant and heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest metal structural material in engineering applications, magnesium alloy has low density, high specific strength and specific stiffness, excellent damping and shock absorption performance, and good heat dissipation. It is easy to recycle, has environmental protection characteristics, and has a very wide range of applications. It is favored by industries such as aerospace, electronic communication and automobile industry, and has become one of the most potential metal structural materials. AZ series magnesium alloys have good casting process performance, high room temperature mechanical properties, small thermal cracking tendency, low cost and easy forming, and become the most widely used magnesium alloys, such as AZ31, A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 陈君张清李全安李梅菊朱宏喜周耀严景龙
Owner HENAN UNIV OF SCI & TECH
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