Flux-free vacuum-cast high-purity magnesium alloy and preparation method thereof
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A technology for vacuum casting and magnesium alloys, applied in the field of magnesium alloys, can solve the problems of less shrinkage porosity and less ingot defects, and achieve the effects of less shrinkage porosity, less ingot defects and less wear and tear.
Active Publication Date: 2019-08-09
郑州轻研合金科技有限公司
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[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
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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-cast high-purity magnesium alloy and a preparation method thereof. The method includes the following steps that (1) raw materials are preheated; (2) heating and smelting are performed as follows: after the inside of a furnace is pumped to be vacuum, the furnace is filled with inert gas to be under the pressure being 500-1,000 Pa, power-transmission heatingis started, and the three-stage type heating manner is adopted in the heating process; (3) gas introduction and refinement are performed as follows: gas introduction and refinement are performed in melt obtained in step (2), the inert gas is introduced, in the process of gas introduction and refinement, the temperature is increased to be 800-850 DEG C at the rate of 3-8 DEG C/min, then high-temperature standing is performed under the temperature condition that 800-850 DEG C is kept, and the standing time ranges from 15 min to 40 min; (4) filtering and casting are performed as follows: after high-temperature standing in step (3) ends, the temperature is reduced to be 760-820 DEG C, and casting is performed after filtering; (5) cooling is performed as follows: after casting in step (4), furnace cooling is started, or the inert gas is introduced for boosting cooling, and then a magnesium alloy cast ingot is obtained. The obtained magnesium alloy is uniform in structure, free of nonmetalslag inclusions (such as flux slag inclusions and oxidation slag inclusions), low in shrinkage porosity, few in cast ingot defect and obvious in effect on magnesium-rare earth alloys difficult in slagremoval.
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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