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A diversion device and casting system for semi-continuous casting of magnesium alloy

A shunt device and magnesium alloy technology are applied in the field of shunt devices for semi-continuous casting, which can solve the problems of high probability of hot cracking phenomenon and the like.

Active Publication Date: 2017-12-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the traditional flow splitting device, the magnesium alloy liquid is exposed to the air, and it is easier to produce oxide scales. As the liquid flows, oxide inclusions are formed, and the alloy liquid flows into the crystallizer from different positions. Big

Method used

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  • A diversion device and casting system for semi-continuous casting of magnesium alloy
  • A diversion device and casting system for semi-continuous casting of magnesium alloy
  • A diversion device and casting system for semi-continuous casting of magnesium alloy

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preparation example Construction

[0044] In a specific embodiment of the present invention, the preparation method of the zirconia matrix porous ring 5 preferably includes the following steps:

[0045] Mixing zirconia and a binder, followed by preforming and sintering in sequence to obtain a zirconia matrix porous ring;

[0046] The binders include polystyrene, sodium hyaluronate, and polymethylmethacrylate.

[0047] In the present invention, the particle size of the zirconia is preferably 1.5-6 mm; the present invention has no special limitation on the source of the zirconia, and the above-mentioned zirconia well known to those skilled in the art can be used. sell goods. In the present invention, the particle size of the zirconia has a certain influence on the average diameter of the pores in the porous ring 5 of the zirconia matrix. The larger the particle size of the zirconia, the larger the average diameter of the pores in the formed porous ring.

[0048]In the present invention, the binder includes poly...

Embodiment 1

[0073] Prepare a high temperature resistant adhesive according to the composition of the following volume ratio: polystyrene: 30%; sodium hyaluronate: 40%; polymethyl methacrylate: 30%, mix 2mm zirconia ceramic particles with the above adhesive , the volume of zirconia ceramic particles is 50%, stirring in a mixer for 15 minutes, placing the mixed mixture in a mold and cold pressing to form a ring blank, the outer diameter of the ring blank is 120 mm, and the thickness is 35 mm. The height is 60mm, and the dried billet is sintered in a high-temperature furnace. The sintering process is: 300°C for 20 hours; 1550°C for 5 hours, and then vibrate and clean the porous ring. The average hole diameter of the zirconia matrix porous ring is 6mm. , blow dry the porous ring after cleaning, and install the upper and lower cover discs. Place the diverter device in accordance with the figure 1 As shown in the assembly, use a crystallizer with a diameter of 600mm to cast MB26 magnesium allo...

Embodiment 2

[0075]Prepare a high temperature resistant adhesive according to the composition of the following volume ratio: polystyrene: 35%; sodium hyaluronate: 30%; polymethyl methacrylate: 35%, mix 6mm zirconia ceramic particles with the above adhesive , the volume of zirconia ceramic particles is 55%, stirring in a mixer for 15 minutes, placing the mixed mixture in a mold and cold pressing to form a ring blank, the outer diameter of the ring blank is 150 mm, and the thickness is 20 mm. The height is 35mm; the dried ring blank is sintered in a high-temperature furnace. The sintering process is: 300°C for 20 hours; 1550°C for 5 hours, and then vibrate and clean the zirconia matrix porous ring. The average hole diameter is 10mm, the zirconia matrix porous ring is cleaned and dried, and the upper cover and the lower cover disc are installed; the shunt device is installed according to figure 1 Assembled as shown, using a crystallizer with a diameter of 500mm to cast the Mg-10Gd-3Y-0.5Zr ma...

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Abstract

The invention provides a diverter device and a casting system for semi-continuous casting of magnesium alloys. The diverter device includes a zirconia matrix porous ring and an upper cover and a lower cover respectively arranged at both ends of the zirconia matrix porous ring, so that the The porous ring of the zirconia matrix forms a cavity with the upper cover and the lower cover; the upper cover is provided with holes, so that the magnesium alloy liquid enters the cavity through the holes; in the cavity, the lower cover is provided with Splitter cone; the hole and the splitter cone are coaxial; the holes in the porous ring of the zirconia matrix include closed holes and connected holes, and the average diameter of the holes in the porous ring of the zirconia matrix is ​​5-20 mm; the connected hole channel The total volume of the zirconia matrix porous ring accounts for 20% to 50% of the volume. The diverter device is applied in a semi-continuous casting system, through the tortuous holes in the side wall of the porous ring, the magnesium alloy liquid flows out from the holes in the side wall in the form of infiltration, fully reducing the probability of component segregation, thereby reducing the phenomenon of thermal cracking.

Description

technical field [0001] The invention relates to a splitter device for semi-continuous casting, in particular to a splitter device and a casting system for semi-continuous casting of magnesium alloys. Background technique [0002] With the rapid development of my country's economy, more and more magnesium alloy materials are used in high-tech manufacturing fields such as train shells, spacecraft weight-reducing parts, and special machinery weight-reducing parts. Except for a few of these parts that can be directly formed by casting technology, most of them need to be realized by forging and rolling processes. Therefore, the preparation of large-size magnesium alloy ingots with excellent performance becomes the key. At present, the preparation of large-size magnesium alloy ingots in non-ferrous alloys mostly adopts a semi-continuous casting process: first, the alloy liquid flows out from the high-temperature furnace, and flows into the splitter device through the pipetting de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/103
CPCB22D11/103
Inventor 张洪杰程丽任佟立波邱鑫
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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