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A kind of flux-free vacuum casting high-purity magnesium alloy and its preparation method

A vacuum casting and magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of less shrinkage porosity and ingot defects, and achieve the effects of less shrinkage porosity, less ingot defects, and avoiding oxidation inclusions and flux slag inclusions

Active Publication Date: 2021-07-02
郑州轻研合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problem that there are many flux slag inclusions and oxidation inclusions in the magnesium alloy structure in the prior art, and provides a flux-free vacuum casting high-purity magnesium alloy and its preparation method. The obtained magnesium alloy has uniform structure, no non-metallic slag inclusions, Less shrinkage and porosity, less ingot defects

Method used

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  • A kind of flux-free vacuum casting high-purity magnesium alloy and its preparation method
  • A kind of flux-free vacuum casting high-purity magnesium alloy and its preparation method
  • A kind of flux-free vacuum casting high-purity magnesium alloy and its preparation method

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Embodiment 1

[0034] A preparation method of a high-purity magnesium alloy for flux-free vacuum casting, the specific implementation steps are as follows:

[0035] The selected alloy composition (mass percentage) is: 13% Gd, 3.8% Y, 1.8% Zn, 0.5% Ca, 0.6% Zr, of which the total amount of impurity elements Fe, Ni, Si, etc. is less than 0.1%, and the balance is Mg.

[0036] Its preparation process is:

[0037] (1) Preheating of raw materials: batching is carried out according to the ratio of the above elements. The raw materials used in batching are semi-continuous pure magnesium, pure zinc, pure calcium, Mg-30Gd and Mg-30Y (wt.%) master alloy and Mg-30Zr ( wt.%) master alloy, first remove the surface oxide skin of pure magnesium, pure zinc, pure calcium, magnesium rare earth master alloy and magnesium-zirconium master alloy, and then put it into a desktop furnace for preheating, the preheating temperature is 150 ℃;

[0038] (2) Vacuuming: The melting and casting equipment adopts a power fre...

Embodiment 2

[0048] A preparation method of a high-purity magnesium alloy for flux-free vacuum casting, the specific implementation steps are as follows:

[0049] The selected alloy composition (mass percentage) is: 11% Gd, 1%Y, 1%Ce, 1.2% Zn, 0.3% Ca, 0.5%Zr, of which the total amount of impurity elements Fe, Ni, Si, etc. is less than 0.1%, and the balance for Mg.

[0050] Its preparation process is:

[0051] (1) Preheating of raw materials: batching is carried out according to the ratio of the above elements. The raw materials used in batching are semi-continuous pure magnesium, pure zinc, pure calcium, Mg-30Gd, Mg-30Y and Mg-30Ce (wt.%) master alloy and Mg-30Zr (wt.%) master alloy, first remove the surface oxide skin of pure magnesium, pure zinc, pure calcium, magnesium rare earth master alloy and magnesium-zirconium master alloy, and then put it into a table furnace for preheating, the preheating temperature is 120°C;

[0052] (2) Vacuumize. The melting and casting equipment adopts ...

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Abstract

The invention provides a flux-free vacuum casting high-purity magnesium alloy and its preparation method, comprising the following steps: (1) preheating of raw materials; (2) heating up and melting: after vacuuming the furnace, filling inert gas to 500-1000Pa, Start power transmission to raise the temperature, and the heating process adopts a three-stage heating method; (3) Ventilation refining: carry out aeration refining in the melt obtained in step (2), the gas introduced is inert gas, and in the aeration refining process, with 3 Heat up to 800-850°C at a rate of ‑8°C / min, and then stand at a high temperature at a temperature of 800‑850°C for 15‑40min; (4) Filtration casting: Step (3) Standing at high temperature After finishing, cool down to 760-820°C, filter and cast; (5) Cool down: after casting in step (4), start to cool with the furnace, or fill in inert gas to increase the pressure and cool down, so as to obtain magnesium alloy ingots. The magnesium alloy obtained by the invention has uniform structure, no non-metallic slag inclusions (flux slag inclusions, oxidation slag inclusions), less shrinkage porosity, less ingot defects, and obvious effect on magnesium rare earth alloys which are difficult to remove slag.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, and in particular relates to a flux-free vacuum casting high-purity magnesium alloy and a preparation method thereof. Background technique [0002] In recent years, with the rise of the country, the performance requirements for aerospace and military weapons and equipment have become higher and higher, and aircraft such as rockets, satellites, missiles, and aircraft have been developed rapidly. Due to the blockade of foreign cutting-edge technology, many shortcomings have also been exposed during the rapid development. For example, if the X-type cruise missile developed by my country Aerospace Academy needs to achieve better positioning, it needs to install Beidou, American GPS, and Russian GLONASS three positioning systems at the same time, which greatly increases the burden on cruise missiles and causes my country's The range and accuracy of this type of missile are lower than those of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22C1/06B22D1/00B22D43/00C22F1/06B22D27/04
CPCB22D1/00B22D27/04B22D43/004C22C1/03C22C1/06C22C23/06C22F1/06
Inventor 刘金学肖阳解海涛刘志鹏高华郝益伟马凯杰郭晓光
Owner 郑州轻研合金科技有限公司
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