A melt protection device and method

Abstract

The embodiment of the present invention discloses a melt protection device and method for protecting the melt. The device according to the embodiment of the present invention includes: an inert gas protection ring, an inert gas protection cover, and a crystallizer, and the inert gas protection ring is placed between the lower surface of the inert gas protection cover and the upper edge of the crystallizer, and the gap between the two is increased. distance, the inert gas protective cover is placed on the upper edge of the inert gas protective ring to cover the upper edge of the inert gas protective ring, and the crystallizer is placed under the lower edge of the inert gas protective ring for Holds alloy melt.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a melt protection device and method. Background technique [0002] The smelting and casting process of aluminum-lithium alloy is complicated, which is quite different from ordinary aluminum alloy. The reason is that metal lithium has extremely active characteristics. After adding lithium to aluminum alloy, it will react rapidly with air and oxidize, making the metal in the molten state Aluminum-lithium alloys are prone to chemical reactions with oxygen in the air, and the melt will burn and oxidize, so the protection of the melt is extremely difficult. [0003] In the prior art, argon is used to protect the environment to cast aluminum-lithium alloys, and the inert argon is heavier than air, and the argon does not react with the aluminum-lithium alloy to isolate the melt in the crystallizer from contact with the air, so as to achieve The purpose of protecting the melt. An...

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Problems solved by technology

[0004] However, under the existing mold melt protection method, the argon space in the mold is not completely sealed, and the aluminum-lithium alloy casting process determines that the distance between the melt level and the upper edge of the mold is only 30 mm to 50 mm. mm height, the thickness of the protective argon layer is not enough, and the space that can accommodate the protective argon gas is very limited. In addition, during the casting process, it is necessary to open the protective cover from time to time to carry out melt lubrication, slag removal, observation, etc. in the crystallizer. Casting operation, the protective argon deposited in the crystallizer is easy to float and escape, and the argon protective layer becomes thinner and discontinuous, which leads to the aluminum-lithium alloy melt being in contact with the air, the protection effect becomes poor, and the melt oxidizes; once the melt oxidizes After intensification, the casting process will not go on due to severe oxidation, and the oxidized slag will also be involved in the ingot, which will open the protective cover more frequently for slag breaking and lubrication operations, and the melt will be more likely to oxidize, resulting in a vicious circle

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