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Magnesium alloy and smelting and heat treatment processes thereof

A magnesium alloy and process technology, applied in the field of magnesium-calcium-zinc alloy and its smelting and heat treatment process, can solve the problems of poor mechanical properties, poor strength and mechanical properties of pure magnesium, and achieve improved mechanical properties, improved casting performance, and liquid The effect of phase temperature reduction

Inactive Publication Date: 2013-08-14
SHANGHAI CHILDRENS MEDICAL CENT AFFILIATED TO SHANGHAI JIAOTONG UNIV SCHOOL OF MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a magnesium alloy, which can solve the problems of poor mechanical properties, poor strength and mechanical properties of pure magnesium in the prior art

Method used

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  • Magnesium alloy and smelting and heat treatment processes thereof
  • Magnesium alloy and smelting and heat treatment processes thereof
  • Magnesium alloy and smelting and heat treatment processes thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare to make magnesium alloy I. In this experiment, magnesium ingots are used as the main component (see Table 1-1), and metal calcium and metal zinc are alloy elements. , to prepare magnesium-calcium-zinc alloy, the experimental materials, weight and drugs used are shown in Table 1-2, and the main equipment used in this experiment is listed in Table 1-3.

[0043] Table 1-1 Composition of pure magnesium ingot

[0044]

[0045] Table 1-2 Experimental materials, weight and drugs

[0046]

[0047] Table 1-3 Experimental instruments and equipment

[0048]

[0049] Melting process steps:

[0050] (1) Divide the magnesium ingot into small pieces, remove the impurities and scale on the surface of the magnesium ingot, and weigh the metal zinc and metal calcium separately for use;

[0051] (2) Clean up the equipment used and try to avoid mixing impurities during the smelting process;

[0052] (3) Before melting, preheat the graphite crucible and mold to 280-290°C...

Embodiment 2

[0065] Prepare to make magnesium alloy II. In this experiment, magnesium ingot is used as the main component (see Table 1-1), and metal calcium and metal zinc are alloy elements. , to prepare magnesium-calcium-zinc alloy, the experimental materials, weight and drugs used are shown in Table 1-5, and the main equipment used in this experiment is listed in Table 1-3.

[0066] Table 1-5 Experimental materials, weight and drugs

[0067]

[0068] The smelting process and heat treatment process steps are the same as in Example 1.

[0069] Experimental design The composition of magnesium alloy II is 98% magnesium, 1.0% calcium, 2% zinc, and other <0.01%. Although there is protective gas (argon and sulfur hexafluoride) during the melting process, the molten magnesium will also melt to varying degrees. At the same time, Ca and Zn elements have a certain loss, so the actual composition of the prepared alloy is not completely consistent with the design composition.

[0070] During th...

Embodiment 3

[0074] Using the magnesium alloy prepared in Example 1 or 2 as a material, a medical biodegradable airway stent can be made, which can be applied to children with congenital or acquired airway stenosis.

[0075] At present, the treatment methods for tracheal stenosis are mainly surgery or intratracheal stenting. There are many surgical complications, such as subcutaneous emphysema, infection, hemorrhage, pneumothorax, tracheoesophageal fistula, etc., which are not the first choice for treatment. The existing airway stent has a very prominent shortcoming: regardless of whether the treatment succeeds or fails, the stent needs to be taken out again. This will further increase the risk of related adverse complications, especially the progress of the treatment of airway stenosis in infants and young children is greatly restricted.

[0076] However, the above disadvantages can be avoided by using the biodegradable airway stent of the present invention, because the above-mentioned m...

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Abstract

The invention provides a magnesium alloy, which comprises the following components in percentage by weight: 0.5-1.5% of calcium, 0.5-2.5% of zinc, and the balance of magnesium, wherein the sum of weight percentages is 100%. The invention also provides a melting process of the magnesium alloy, which comprises the following steps: (1) slicing magnesium ingots and removing impurities, and weighing zinc and calcium for standby; (2) preheating a crucible and a die; (3) putting the magnesium slices into the crucible, putting the crucible in a furnace, and after an operation of vacuumizing is completed, feeding mixed gas into the furnace; (4) heating the furnace until the magnesium slices are completely molten, and heating and stirring the obtained product; (5) wrapping metal calcium with an aluminum foil, adding the obtained object in the bottom of molten magnesium, then adding zinc slices, carrying out stirring and slag removal on the obtained mixture, and after the obtained product is heated, carrying out heat preservation on the obtained product; and (6) cooling molten liquid, carrying out heat preservation on the molten liquid, opening the furnace, taking the die, pouring the molten liquid into the die, and waiting. The invention also provides a heat treatment process of the magnesium alloy, which comprises the following steps of (1) homogenized annealing; and (2) solid solution treatment. The magnesium alloy disclosed by the invention has the advantages that the mechanical properties of the alloy are improved, the casting performance is improved, and the creep resistance of the alloy is increased.

Description

technical field [0001] The invention relates to an alloy and its process method, in particular to a magnesium-calcium-zinc alloy and its melting and heat treatment process. Background technique [0002] In the field of industrial materials, magnesium, as the lightest metal structure material, has excellent performance and abundant resources, and is widely used in various fields such as aerospace, electronics, automobiles, and home appliances. However, due to the constraints of various factors such as corrosion resistance, material preparation, and processing technology, there are great differences in the development potential and practical application of magnesium. [0003] The main problems of pure magnesium in industrial applications are: 1. Pure magnesium has poor mechanical properties, which cannot meet the requirements of industrial parts for tensile strength and yield strength; 2. Pure magnesium grains are relatively coarse and unevenly distributed, which affects the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/02C22F1/06
Inventor 陆兆辉徐志伟王顺民薛邦德
Owner SHANGHAI CHILDRENS MEDICAL CENT AFFILIATED TO SHANGHAI JIAOTONG UNIV SCHOOL OF MEDICINE
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