Flame retardant magnesium alloy material and preparation method thereof

A magnesium alloy and alloy technology, applied in the field of flame-retardant magnesium alloy materials and their preparation, can solve the problems of difficult production, processing and handling, elongation rate of only 2%, and unsatisfactory strength and toughness of magnesium alloys, etc., and achieve good mechanical properties and Improvement of flame retardant performance, mechanical properties and flame retardant properties, simple melting and heat treatment process

Active Publication Date: 2017-09-05
HENAN UNIV OF SCI & TECH
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Problems solved by technology

However, the application of magnesium alloys is restricted by the following factors: First, the strength and toughness of magnesium alloys are not ideal, which limits their wide use
The second is that magnesium alloys are very flammable. Because magnesium is relatively active, magnesium alloys are prone to oxidative combustion during smelting and processing. Generally, magnesium alloys are smelted in flame-retardant solvents or protective atmospheres. This characteristic of being easy to oxidize and burn brings great difficulties to the production, processing and treatment of alloys, which greatly hinders the wide application of magnesium alloys. Obtaining ideal high-strength flame-retardant magnesium alloys has always been an important topic in the field of magnesium alloy research.
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 tensile The strength is only 160MPa, and the elongation is only 2%. Its strength and elongation cannot meet the current industrial applications
The tensile strength and flame retardancy of the heat-resistant magnesium alloy are difficult to meet the production needs

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  • Flame retardant magnesium alloy material and preparation method thereof

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Embodiment 1

[0029] The flame retardant magnesium alloy material of this embodiment is composed of the following components in mass percentage: Gd 8.6%, Nd 3.0%, Ce 2.2%, Al 1.3%, Sb 1.5%, Sr 0.33%, Ca 0.93%, and the balance is Mg and unavoidable impurities, the total mass fraction of impurity elements Fe, Cu and Ni is less than 0.2%.

[0030] The preparation method of the flame retardant magnesium alloy material of the present embodiment comprises the following steps:

[0031] 1) Preheat the raw materials of pure magnesium, pure aluminum, pure strontium, pure antimony, Mg-Gd master alloy, Mg-Nd master alloy, Mg-Ce master alloy and CaO particles with a particle size of 3-5 μm. The preheating temperature is 240℃, preheating time is 2h;

[0032] 2) Put the preheated pure magnesium, pure aluminum, pure strontium and pure antimony in CO 2 and SF 6 Melt under the protection of mixed gas to obtain melt A;

[0033] 3) in CO 2 and SF 6 Under the protection of a mixed gas, add Mg-Gd master al...

Embodiment 2

[0036] The flame retardant magnesium alloy material of this embodiment is composed of the following components in mass percentage: Gd 9.0%, Nd 3.4%, Ce 1.6%, Al 1.5%, Sb 1.3%, Sr 0.38%, Ca 0.86%, and the balance is Mg and unavoidable impurities, the total mass fraction of impurity elements Fe, Cu and Ni is less than 0.2%.

[0037] The preparation method of the flame-retardant magnesium alloy material of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0039] The flame retardant magnesium alloy material of the present embodiment is made up of the following components by mass percentage: Gd 10.0%, Nd2.8%, Ce 2.4%, Al 1.1%, Sb 1.6%, Sr 0.26%, Ca 1.0%, the balance is Mg and unavoidable impurities, the total mass fraction of impurity elements Fe, Cu and Ni is less than 0.2%.

[0040] The preparation method of the flame-retardant magnesium alloy material of this embodiment is the same as that of Embodiment 1.

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Abstract

The invention relates to a flame retardant magnesium alloy material and a preparation method thereof, and belongs to the technical field of magnesium alloys and manufacturing thereof. The flame retardant magnesium alloy material is prepared from the following components in percentage by mass: 8.6 to 10.4 percent of Gd, 2.6 to 3.4 percent of Nd, 1.6 to 2.9 percent of Ce, 1.1 to 1.5 percent of Al, 1.1 to 1.6 percent of Sb, 0.26 to 0.38 percent of Sr, 0.78 to 1.0 percent of Ca and the balance of Mg and unavoidable impurities. Compared with the prior art, the flame retardant magnesium alloy material disclosed by the invention has the advantages that by reasonable matching of different elements, the comprehensive performance of the flame retardant magnesium alloy material is obviously improved, particularly the mechanical performance and the flame retardancy characteristic at room temperature and high temperature are obviously improved; and meanwhile, the tensile strength of the flame retardant magnesium alloy material has an abnormal temperature effect, namely with the increase of tensile temperature, the tensile strength is also improved.

Description

technical field [0001] The invention relates to a flame-retardant magnesium alloy material and a preparation method thereof, belonging to the technical field of magnesium-based alloys and their manufacture. Background technique [0002] In the existing metal structure material system, magnesium alloy has high specific strength and specific stiffness, excellent casting performance and high damping and anti-vibration performance, is easy to recycle, has environmental protection characteristics, and has a very wide application prospect. Aerospace, electronic communication, and automobile industries are favored, and it has become one of the most promising metal structural materials at present. However, the application of magnesium alloys is restricted by the following factors: First, the strength and toughness of magnesium alloys are not ideal, which limits their widespread use. The second is that magnesium alloys are very flammable. Because magnesium is relatively active, magn...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/008C22F1/06
Inventor 李全安陈君张清朱利敏付三玲陈晓亚张帅王颂博关海昆
Owner HENAN UNIV OF SCI & TECH
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