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A kind of preparation technology of heat-resistant mg-sr-zn-y alloy

A preparation process and alloy technology, which is applied in the field of preparation technology of heat-resistant Mg-Sr-Zn-Y alloys, can solve the problems of decreased creep resistance, poor heat resistance, and difficulty of meeting magnesium alloys, and achieve high heat resistance. high performance, low cost

Inactive Publication Date: 2011-12-07
JIAMUSI UNIVERSITY
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Problems solved by technology

However, compared with aluminum alloys, the application of magnesium alloys in automotive structural parts is still limited. An important factor restricting its application is the heat resistance of commercial magnesium alloys (such as AZ91D, AM50A, and AM60B, etc.) commonly used in automotive parts manufacturing. The performance is poor. When the temperature of the parts is higher than 125°C, the creep resistance of the magnesium alloy will drop sharply, and it is difficult to meet the high working temperature of the automatic transmission, cylinder block and cylinder head of the automobile (175°C, 200°C, 300°C and above) parts performance requirements [2，3]

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  • A kind of preparation technology of heat-resistant mg-sr-zn-y alloy
  • A kind of preparation technology of heat-resistant mg-sr-zn-y alloy

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Embodiment Construction

[0012] In conjunction with the accompanying drawings, the preparation process of the present invention is described in detail:

[0013] First, the purchased SrCO 3 The powder is prepared into SrO, and the process is to keep the temperature at 1250°C for 3h. The reaction mechanism is: SrCO 3(s) =SrO (s) +CO 2(g) , the final Sr content is 5% (mass ratio, the same below). In order to prevent the oxidative combustion of the melt, sulfur hexafluoride (SF 6 ) gas protection. Secondly, turn on the power of the pit furnace, put the crucible into the melting furnace to heat, put the preheated magnesium block and strontium oxide powder into the crucible to heat up and melt, and open the protective gas when the magnesium ingot starts to melt. Then, after the magnesium block is completely melted, stir it, remove the slag and let it stand to make the melt homogeneous, then raise the temperature to 810°C for refining for 30 minutes, cool down to 750°C, add 1% rare earth Y in sequence,...

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Abstract

The invention provides a preparation process of a heat-resistant Mg-Sr-Zn-Y alloy. In the preparation process, an industrial pure magnesium ingot and strontium carbonate are used as raw materials, small amounts of rare earth Y and metal Zn are added, and the Mg-Sr-Zn-Y alloy is prepared by using a melting-dipping thermal reduction method. The preparation process provided by the invention has the beneficial effects that inexpensive metal Zn particles are used for substituting for part of expensive rare earth Y, thereby realizing the development on the low-cost and high-heat-resistance Mg-Sr-Zn-Y alloy.

Description

Technical field: [0001] The invention specifically relates to a preparation process of a heat-resistant Mg-Sr-Zn-Y alloy. Background technique: [0002] Magnesium alloy is currently the lightest metal structural material available in industry. It has the advantages of low density, high specific strength, and high specific stiffness. It has been used in the automobile industry. At the same time, it is known as the "green structural material" in the 21st century because of its above-mentioned characteristics, strong damping, vibration and noise reduction capabilities, superior liquid forming performance, and easy recycling. [1] . However, compared with aluminum alloys, the application of magnesium alloys in automotive structural parts is still limited. An important factor restricting its application is the heat resistance of commercial magnesium alloys (such as AZ91D, AM50A, and AM60B, etc.) commonly used in automotive parts manufacturing. The performance is poor. When the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02
Inventor 胡明田丽华韩非
Owner JIAMUSI UNIVERSITY
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