Alkaline-earth heat insulating magnesium alloy for vehicle use and producing method thereof

A magnesium alloy and alkaline earth technology, which is applied in the field of alkaline earth heat-resistant magnesium alloy and its preparation, can solve problems such as increased equipment investment, environmental pollution, and reduced alloy performance, and achieve comprehensive performance improvement, good flame retardancy, and heat resistance. The effect of performance requirements

Inactive Publication Date: 2007-11-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that flux protection method and SF6, SO 2 , CO 2 , Ar and other gas protection methods are effective flame retardant methods, but they will cause serious environmental pollution in the application, and they will be mixed into the alloy during casting, which will reduce the performance of the alloy and increase the investment in equipment

Method used

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  • Alkaline-earth heat insulating magnesium alloy for vehicle use and producing method thereof
  • Alkaline-earth heat insulating magnesium alloy for vehicle use and producing method thereof
  • Alkaline-earth heat insulating magnesium alloy for vehicle use and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: The composition of the alloy is (weight percent): 7.5% Al, 1.2% Zn, 0.1% Mn, 1.5% Ca, 0.05% Sr, 89.65% Mg (containing trace unavoidable impurities).

[0040] The present invention smelts in the molten pool of low-carbon steel, and only adds a little RJ2 covering agent in the early stage of smelting, and the raw materials adopted are: magnesium is pure magnesium, with a purity greater than 99.99%; aluminum is pure aluminum, containing at least 99.9%; zinc is commercially available The pure zinc for sale has a purity of 99.8%; manganese is electrolytic flake pure manganese, which should be coated and pressed into the alloy liquid during smelting, and the dissolution time of more than 30 minutes should be guaranteed; calcium is in the form of an intermediate alloy Al-75% Ca When added, it is easy to suspend on the liquid surface and oxidize rapidly. When added, it should be coated and pressed into the alloy liquid; strontium is added in the form of master alloy A...

Embodiment 2

[0042] Embodiment 2: The alloy composition adopted is (by weight): 9% Al, 0.8% Zn, 0.8% Mn, 0.8% Ca, 0.15% Sr, 88.45% Mg (containing trace unavoidable impurities). Select the appropriate proportion of raw materials according to the above proportions. Under the protection of a small amount of covering agent, first add the preheated pure magnesium into the crucible. After it is completely melted, add pure aluminum and pure zinc respectively at about 650 ° C. Finally, pure manganese, Al-Sr, and Al-Ca master alloys are coated and pressed into the liquid surface to prevent suspension on the liquid surface and oxidation. After the alloy is completely melted, stir and mix evenly and raise the temperature to 720°C. After 20 minutes of refining, it can be seen that the magnesium liquid has a silver-white mirror surface, and the surface is covered with a very thin layer of solvent. Let it stand for 30 minutes before pouring. The temperature of the permanent mold is 150°C, the liquid flo...

Embodiment 3

[0043] Example 3: The alloy composition used is (by weight): 8% Al, 1% Zn, 0.45% Mn, 1.1% Ca, 0.1% Sr, 89.35% Mg (containing trace unavoidable impurities). Configure alloy raw materials according to the above ingredients, add preheated Mg into the cleaned electric heating crucible, and sprinkle a small amount of RJ2 covering agent on the magnesium and the bottom of the crucible; after the pure magnesium is completely melted, add Al and Zn respectively After the melting is complete, wrap the intermediate alloy of Mn, Ca, and Sr with aluminum foil, press it under the liquid surface, and after it is completely melted, raise the temperature to 720°C, and stir the alloy liquid vigorously with a stirring spoon for 10 minutes. After completion, the magnesium liquid can be seen as a silver-white mirror. , non-stick stirring tool, the liquid surface is covered with a very thin layer of solvent. After standing still for 30 minutes, pour it into a steel mold with a temperature of 150°C. ...

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Abstract

The heat resistant magnesium alloy for use in automobile has the components including Al 7-10 wt%, Zn 0.8-1.2 wt%, Mn 0.1-0.8 wt%, Ca 0.1-1.5 wt%, Sr 0.05-0.15 wt%, and Mg 88-91 wt%. During smelting, intermediate alloys Al-Ca and Al-Sr are added into magnesium alloy melt to increase Ca and Sr contents; and after smelting, the magnesium alloy is solid solution treated at 410 deg.c for 16-24 r and ageing treated at 180 deg.c for 16-40 hr to raise the strength. The heat resistant magnesium alloy is one kind of cast alloy with room temperature strength higher than that of AZ91 alloy, relatively high creep property at high temperature, high fire retarding performance, less interdendritic shrinkage and other casting faults and low cost, and is suitable for use in producing high temperature automobile parts.

Description

technical field [0001] The invention relates to an alkaline earth heat-resistant magnesium alloy suitable for the automobile manufacturing industry and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry and the increasing importance of environmental protection, reducing the fuel consumption and reducing CO 2 and other fuel oxides are becoming more and more urgent to the environment. As the lightest structural material, magnesium alloy has the advantages of high specific strength, excellent damping and shock absorption, heat dissipation, easy processing and recycling, etc. It is most suitable for many parts in the automotive industry, such as the gearbox housing of a car , intake manifold, crankcase, cylinder head and oil pan, etc., these components have been working under high temperature and high stress for a long time. [0003] Commonly used cast magnesium alloys such as AZ91D, AM60, etc. have high strength a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03B22D21/04C22F1/06
Inventor 李落星胡文俊高文理白星王群
Owner HUNAN UNIV
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