Preparation method of in situ synthesized MgO reinforced Mg-based composite material

An in-situ synthesis and composite material technology, which is applied in the field of metal composite materials, can solve the problems of material oxidation and pollution, multiple processes, and the influence of magnesium oxide on the performance of magnesium-based composite materials, so as to achieve improved performance, uniform distribution, good mechanics and The effect of physical properties

Inactive Publication Date: 2012-03-28
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the in-situ synthesis of MgO-reinforced Mg-based composites by the above-mentioned methods has the characteristics of low cost and other characteristics, these methods have

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1 : Under the protection of inert gas, melt 10Kg of Mg-7wt%Al magnesium alloy and heat it up to 850°C and keep it warm during the subsequent injection process, and then use the adjustable gas pressure and flow rate to control the amount of powder spraying The device (such as the XCPF-C powder injection device produced by Shanghai Xinhua Gas Welding Tool Factory) blows SrO powder into the magnesium alloy melt. The specific injection process is: the particle size of SrO powder is 70-140 mesh; the gas used for injection It is an inert gas; the injection rate of SrO per 10Kg of magnesium alloy melt is 15gSrO / min; the injection pressure of the inert gas is 10L / min; the injection time is 50min. After the thermal insulation injection is finished, lower the temperature of the magnesium alloy melt to 700°C and keep it warm. After stirring the alloy melt with a graphite rod, the stirring time is 20 minutes, and the stirring rate is 200 rpm. After stirring, the scum on the...

Embodiment 2

[0010] Example 2 : Under the protection of inert gas, melt 10Kg of Mg-9Al-1Zn magnesium alloy and heat it up to 900°C and keep it warm during the subsequent injection process, and then use the adjustable gas pressure and flow rate to control the amount of powder spraying The device (such as the XCPF-C powder injection device produced by Shanghai Xinhua Gas Welding Tool Factory) blows SrO powder into the magnesium alloy melt. The specific injection process is: the particle size of SrO powder is 70-140 mesh; the gas used for injection It is an inert gas; the injection rate of SrO per 10Kg of magnesium alloy melt is 20gSrO / min; the injection pressure of the inert gas is 18L / min; the injection time is 90min. After the thermal insulation injection is finished, lower the temperature of the magnesium alloy melt to 720°C and keep it warm. After stirring the alloy melt with a graphite rod, the stirring time is 40 minutes, and the stirring rate is 1000 rpm. After stirring, the scum on ...

Embodiment 3

[0011] Example 3 : Under the protection of inert gas, melt 10Kg of Mg-5Zn-0.5Zr magnesium alloy, heat it up to 870°C and keep it warm during the subsequent injection process, and then use adjustable gas pressure and flow rate to control the amount of powder injection Powder device (such as XCPF-C powder injection device produced by Shanghai Xinhua Gas Welding Tool Factory) blows SrO powder into the magnesium alloy melt. The specific injection process is: the particle size of SrO powder is 70-140 mesh; The gas is an inert gas; the injection rate of SrO per 10Kg of magnesium alloy melt is 18gSrO / min; the injection pressure of the inert gas is 14L / min; the injection time is 70min. After the thermal insulation injection is completed, the temperature of the magnesium alloy melt is lowered to 710°C and kept warm, and after the alloy melt is stirred with a graphite rod, the stirring time is 30 minutes, and the stirring rate is 600 rpm. After stirring, the scum on the surface is remo...

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Abstract

The invention relates to a preparation method of an in situ synthesized MgO reinforced Mg-based composite material. The preparation method comprises the following steps: 1, melting Mg alloy and heating the Mg alloy to 850-900DEG C under the protect of an inert gas, and keeping the temperature in the subsequent blowing process; 2, blowing SrO powder into the obtained Mg alloy melt, cooling the Mg alloy melt to 700-720DEG C after finishing the temperature keeping blowing, keeping the temperature, and stirring the obtained alloy melt by a graphite rod for 20-40min according to a stirring rate of 200-1000rpm; and 3, removing scum from the surface after stirring, casting in a metal die, and allowing to solidify to obtain the in situ synthesized MgO reinforced Mg-based composite material. According to the invention, above stirring casting process is combined with above in situ reaction process, so the MgO reinforced Mg-based composite material is prepared through the simple in situ synthesis without changing original stirring and casting devices and the original technological flow; the prepared Mg-based composite material has good mechanical and physical properties; and problems of relatively complex operations and easily caused material oxidation and pollution of original methods are avoided.

Description

technical field [0001] The invention relates to a method for preparing an in-situ synthesized MgO reinforced magnesium-based composite material, which belongs to the technical field of metal composite materials. Background technique [0002] Magnesium-based composite materials have the advantages of low density, high specific strength and specific stiffness, good dimensional stability, low-temperature superplasticity, excellent casting performance, mechanical and physical properties, etc., making them the most promising modern high-tech fields. A composite material used. At present, the magnesium-based composites that have been researched and developed are mainly concentrated on continuous fiber (long fiber) reinforced magnesium-based composites and discontinuous (short fibers, whiskers and particles) reinforced magnesium-based composites. Among these two types of magnesium-based composites, although continuous fiber-reinforced magnesium-based composites have high specific ...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C1/02C22C23/00
Inventor 杨明波潘复生郭廷长李洪亮李晖胡红军周涛王春欢
Owner CHONGQING UNIV OF TECH
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