A composite crucible for smelting aluminum-lithium alloy and a method of manufacturing the same

The aluminum-lithium alloy melting crucible with a three-layer composite structure solves the problems of contamination and cracking during the aluminum-lithium alloy melting process, and achieves a melting effect with stability and long service life at high temperatures, which is suitable for the industrial production of large and complex aluminum-lithium alloy parts.

CN116929064BActive Publication Date: 2026-06-23SHANGHAI JIAOTONG UNIV
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Patent Information

Application Number
CN202310954063.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-31
Publication Date
2026-06-23
Estimated Expiration
2043-07-31

AI Technical Summary

Technical Problem

Existing aluminum-lithium alloy melting crucibles are prone to reacting with the alloy liquid at high temperatures, leading to contamination and shortened service life. Furthermore, they are prone to cracking due to differences in thermal expansion coefficients, making it difficult to meet the needs of large and complex aluminum-lithium alloy components.

Method used

The crucible adopts a three-layer composite structure, with an inner layer of silicon carbide ceramic, an intermediate layer of carbon fiber felt, and an outer layer of heat-resistant cast steel. By optimizing the material combination and process preparation, reactions and cracking are avoided, and the service life is improved.

Benefits of technology

It significantly improves the crucible life and melt quality of aluminum-lithium alloy smelting, reduces the alloy impurity content, and is suitable for industrial applications of large and complex aluminum-lithium alloy parts.

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Abstract

The application discloses a composite crucible for smelting aluminum-lithium alloy and a preparation method thereof. The composite crucible is composed of an outer heat-resistant cast steel layer, a middle carbon fiber felt layer and an inner silicon carbide ceramic layer. The heat-resistant cast steel is one of ZG40Cr24Si2, ZG50Cr28Ni48W5 and ZG35Cr24Ni7NRE. The middle layer is a carbon fiber felt with a porosity of 30-70% prepared from mesophase pitch-based carbon fibers. The silicon carbide ceramic layer is composed of 85-90% silicon carbide, 5-8% SiO2 and 2-10% mullite. The preparation process of the crucible is simple. The main body of the crucible does not react with lithium, thereby ensuring the quality of the melt. The multi-layer structure makes it easier to replace and repair the damaged crucible, thereby prolonging the service life of the crucible. Meanwhile, the crucible is convenient to transfer and will not crack during the smelting process.
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