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Magnesium-neodymium intermediate alloy and preparation method thereof

A magnesium-neodymium master alloy and magnesium powder technology, applied in the field of magnesium-neodymium master alloy and its preparation, can solve the problems of limiting the application of magnesium alloy, affecting the performance of use, pinholes on the surface of the alloy, etc., achieving strong adsorption and wrapping effect, promoting Dry, strong wetting effect

Pending Publication Date: 2021-11-26
LOUDI XINGXIN ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although magnesium alloys have excellent performance at room temperature, their poor heat resistance limits the application of magnesium alloys in applications where high service temperature is required. Therefore, the development of heat-resistant magnesium alloys with good casting properties is the key to the wide application of magnesium alloys.
At present, the research and development of commercial heat-resistant magnesium alloys mainly focuses on improving their heat-resistant performance by adding rare earth elements, especially the addition of rare earth Nd elements can significantly improve the high-temperature performance of various grades of magnesium alloys, but the prepared magnesium-Nd intermediate The high content of impurities on the surface of the alloy affects its performance, and the hydrogen gas is not completely removed in the production process, resulting in pinholes on the surface of the alloy, which affects the appearance

Method used

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  • Magnesium-neodymium intermediate alloy and preparation method thereof
  • Magnesium-neodymium intermediate alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Multi-element refining agent comprises the following steps:

[0025] Step S1, adding aluminum chloride hexahydrate into a beaker, adding deionized water, stirring at a constant speed until dissolved to obtain liquid a, adding sodium fluoride to deionized water, stirring at a constant speed until dissolved, obtaining liquid b, stirring while Slowly add liquid a to liquid b, stir at a constant speed after complete addition, heat up to 150°C, keep warm and react for 4 hours, centrifuge, wash, and dry after the reaction to obtain crystals, control aluminum chloride hexahydrate and fluoride The weight ratio of sodium is 0.3: 1.05;

[0026] Step S2, add calcium nitrate tetrahydrate, citric acid and diammonium hydrogen phosphate in sequence to deionized water, stir at a constant speed for 15 minutes, then add nitric acid with a mass fraction of 60% to adjust the pH until pH = 2, then heat in a water bath at 75°C for 1 hour, Then raise the temperature to 100°C and keep it warm...

Embodiment 2

[0029] Multi-element refining agent comprises the following steps:

[0030] Step S1, adding aluminum chloride hexahydrate into a beaker, adding deionized water, stirring at a constant speed until dissolved to obtain liquid a, adding sodium fluoride to deionized water, stirring at a constant speed until dissolved, obtaining liquid b, stirring while Slowly add liquid a to liquid b, stir at a constant speed after complete addition, heat up to 150°C, keep warm and react for 4 hours, centrifuge, wash, and dry after the reaction to obtain crystals, control aluminum chloride hexahydrate and fluoride The weight ratio of sodium is 0.4: 1.05;

[0031] Step S2, add calcium nitrate tetrahydrate, citric acid and diammonium hydrogen phosphate in sequence to deionized water, stir at a constant speed for 15 minutes, then add nitric acid with a mass fraction of 60% to adjust the pH until pH = 2, then heat in a water bath at 80°C for 1 hour, Then raise the temperature to 100°C and keep it warm...

Embodiment 3

[0034] Multi-element refining agent comprises the following steps:

[0035] Step S1, adding aluminum chloride hexahydrate into a beaker, adding deionized water, stirring at a constant speed until dissolved to obtain liquid a, adding sodium fluoride to deionized water, stirring at a constant speed until dissolved, obtaining liquid b, stirring while Slowly add liquid a to liquid b, stir at a constant speed after complete addition, heat up to 150°C, keep warm and react for 4 hours, centrifuge, wash, and dry after the reaction to obtain crystals, control aluminum chloride hexahydrate and fluoride The weight ratio of sodium is 0.5: 1.05;

[0036]Step S2, add calcium nitrate tetrahydrate, citric acid and diammonium hydrogen phosphate in sequence to deionized water, stir at a constant speed for 15 minutes, then add nitric acid with a mass fraction of 60% to adjust the pH until pH = 2, then heat in a water bath at 85°C for 1 hour, Then raise the temperature to 100°C and keep it warm ...

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Abstract

The invention relates to a magnesium-neodymium intermediate alloy and a preparation method thereof, and belongs to the technical field of metal materials and metallurgy. The magnesium-neodymium intermediate alloy comprises the following raw materials including, by weight, 10-15 parts of magnesium powder, 10-15 parts of neodymium powder and 0.1-0.15 part of a multi-element refining agent. The magnesium powder is added into a smelting furnace, a protective flux is added, slagging-off is conducted, the neodymium powder is added after slagging-off, the temperature is increased to 1050 DEG C after complete adding, the multi-element refining agent is added, the protective flux is added again after the temperature is increased to 1100 DEG C, secondary slagging-off is conducted, and a smelting material is prepared; brewing and boiling are carried out; ingot casting is carried out; testing is carried out; and carbon powder can serve as a pore-forming agent to decompose and release gas, on one hand, part of hydrogen in molten metal is taken away, on the other hand, nano-calcium-based powder is sintered at the temperature, a large number of porous structures are generated, the specific surface area of the nano-calcium-based powder is increased, the excellent adsorption performance is achieved, residual hydrogen and impurities in melt can be adsorbed, and the effects of refining and impurity removal are achieved.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to a magnesium-neodymium master alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest structural metal material currently used. It has high specific strength, specific stiffness and excellent casting performance. The consumption is particularly significant and has broad application prospects. Although magnesium alloys have excellent performance at room temperature, their poor heat resistance limits the application of magnesium alloys in applications with high service temperature requirements. Therefore, the development of heat-resistant magnesium alloys with good casting properties is the key to the wide application of magnesium alloys. At present, the research and development of commercial heat-resistant magnesium alloys mainly focuses on improving their heat-resistant performance by adding rare ear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C23/06C22C28/00C22C1/03
CPCC22C1/02C22C1/06C22C23/06C22C28/00C22C1/03
Inventor 付友成
Owner LOUDI XINGXIN ALLOY
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