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High-strength heat-conducting magnesium alloy and preparation method thereof

A magnesium alloy and high-strength technology, which is applied in the field of high-strength thermal conductivity magnesium alloy and its preparation, can solve the problems that cannot meet the performance requirements of high-strength and high thermal conductivity magnesium alloy, and achieve the effect of low cost and simple preparation process

Active Publication Date: 2020-06-02
ALLITE (JIANGSU) MAGNESIUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above results, it can be seen that the current market alloys cannot meet the performance requirements for magnesium alloys as structural materials with high strength and high thermal conductivity. Therefore, it is urgent to seek a high-strength and high thermal conductivity magnesium alloy and its preparation process

Method used

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  • High-strength heat-conducting magnesium alloy and preparation method thereof
  • High-strength heat-conducting magnesium alloy and preparation method thereof
  • High-strength heat-conducting magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The composition of a high-strength thermally conductive magnesium alloy is designed as:

[0042] Zr: 0.4wt.%, Zn: 4wt.%, Ca: 0.4wt.%, and the balance is Mg. Its preparation method is as figure 1 , including the following steps:

[0043] (1) Using 99.99% pure magnesium ingot, Zn-10wt.% Ca master alloy, pure zinc and Mg-Zr master alloy as raw materials, according to the above Zr: 0.4wt.%, Zn: 4wt.%, Ca: 0.4wt. %, the balance is Mg for batching;

[0044] (2) First, preheat the resistance furnace at 700°C, then, after spreading the flux at the bottom of the resistance furnace, put 99.99wt% pure magnesium ingots into the resistance furnace, and spread the flux (55-60wt.% KCl, 2~5wt.% CaF 2 , and the rest are BaCl 2 ), then the magnesium ingot is heated up to 740°C with the resistance furnace;

[0045] (3) Preheat the required magnesium ingot, Zn-10wt.% Ca master alloy, pure zinc and magnesium Mg-Zr master alloy at 180°C. After the magnesium block is completely melted, ...

Embodiment 2

[0052] The composition design of a high-strength heat-conducting magnesium alloy is: Zr: 0.5wt.%, Zn: 5wt.%, Ca: 0.6wt.%, and the balance is Mg. Its preparation method is as figure 1 , including the following steps:

[0053] (1) Using 99.99% pure magnesium ingot, Zn-30wt.% Ca master alloy, pure zinc and Mg-Zr master alloy as raw materials, according to the above Zr: 0.5wt.%, Zn: 5wt.%, Ca: 0.6wt. %, the balance is Mg for batching;

[0054] (2) First, preheat the resistance furnace at 700°C, then, after spreading the flux at the bottom of the resistance furnace, put 99.99wt% pure magnesium ingots into the resistance furnace, and spread the flux (55-60wt.% KCl, 2~5wt.% CaF 2 , and the rest are BaCl 2 ), then the magnesium ingot is heated up to 740°C with the resistance furnace;

[0055] (3) Preheat the required magnesium ingots, Zn-30wt.% Ca master alloy, pure zinc and Mg-Zr master alloy at 180°C, and add preheating when the furnace temperature is 740°C after the magnesium ...

Embodiment 3

[0062] The composition design of a high-strength heat-conducting magnesium alloy is as follows: according to the above Zr: 0.6wt.%, Zn: 6wt.%, Ca: 0.8wt.%, and the balance is Mg. Its preparation method is as figure 1 , including the following steps:

[0063] (1) Using 99.99% pure magnesium ingot, Zn-20wt.% Ca master alloy, pure zinc and Mg-Zr master alloy as raw materials, according to the above Zr: 0.6wt.%, Zn: 6wt.%, Ca: 0.8wt. %, the balance is Mg for batching;

[0064] (2) First, preheat the resistance furnace at 700°C, then, after spreading the flux at the bottom of the resistance furnace, put 99.99wt% pure magnesium ingots into the resistance furnace, and spread the flux (55-60wt.% KCl, 2~5wt.% CaF 2 , and the rest are BaCl 2 ), then the magnesium ingot is heated up to 740°C with the resistance furnace;

[0065] (3) Preheat the required magnesium ingot, Zn-20wt.% Ca master alloy and magnesium Mg-Zr master alloy at 180°C. After the magnesium block is completely melte...

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Abstract

The invention discloses a high-strength heat-conducting magnesium alloy and a preparation method thereof. The magnesium alloy comprises, by weight: Zr: 0.2-0.6%, Zn: 4-6%, Ca: 0.4-0.8% and the balanceMg. The preparation method of the magnesium alloy comprises the steps of burdening, adding a magnesium ingot, adding an intermediate alloy, refining, casting, carrying out solution treatment, carrying out extrusion deformation, carrying out the solution treatment again and carrying out aging treatment. According to the high-strength heat-conducting magnesium alloy and the preparation method thereof, in order to promote the formation of alloy Zn-Ca clusters, different Zn-Ca intermediate alloys are selected during the smelting, and the short-time solution treatment is carried out for 1 h or less after the hot extrusion; the tensile strength of the alloy is greater than 325 MPa, the yield strength of the alloy is greater than 280 MPa, the elongation of the alloy is greater than 15%, and theheat conductivity of the alloy is greater than 120 W.(m.K)<-1>; and the magnesium alloy is high in yield, good in processing formability, easy for realizing industrialization, and capable of being used as a heat dissipation structural material of a power supply and electronic device in the field of new generation aerospace.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal materials, and in particular relates to a high-strength heat-conducting magnesium alloy and a preparation method thereof. Background technique [0002] With the rapid development of the aerospace field, the requirements for the mechanical properties and heat dissipation performance of related structural materials are getting higher and higher. At the same time, it is also necessary to take into account the service requirements such as small density and large specific heat capacity. Therefore, high-strength thermally conductive magnesium alloys have an important role in the future Good application prospects. [0003] For pure magnesium, the thermal conductivity at room temperature is 155W·(m·K) -1 , the tensile strength is about 100MPa, it is difficult to be directly used as a structural material. Therefore, in order to meet the requirements of the aerospace field, the mechanical behavio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/03C22C1/06C22F1/06
CPCC22C1/03C22C1/06C22C23/04C22F1/06
Inventor 房大庆吕文雪郭利君刘佳南丁向东孙军
Owner ALLITE (JIANGSU) MAGNESIUM TECH CO LTD
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