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高温合金熔炼用陶瓷坩埚研究进展

Research progress on ceramic crucibles for high-temperature alloy melting

  • 摘要: 高温合金在航空航天发动机、燃气轮机等高温领域中扮演着重要角色。高温合金熔炼过程中,陶瓷坩埚作为关键容器,其与合金熔体的相互作用直接影响合金纯净度、组织均匀性以及服役性能,同时也决定陶瓷坩埚的自身热稳定性与服役寿命。为满足高性能高温合金的熔炼需求,陶瓷坩埚的高温力学性能、导热性、热稳定性与抗侵蚀性亟需进一步改善。本文系统综述了高温合金熔炼用陶瓷坩埚的发展现状,主要包括氧化物耐火材料、非氧化物耐火材料以及氧化物与非氧化物复合耐火材料3大类,并从热稳定性、导热性、抗侵蚀性等方面简析其服役性能及改性方法,重点阐述了复合结构设计与氧化锆掺杂等提升材料抗热震性能与抗侵蚀性能的策略,同时本文从润湿、侵蚀和剥落3个方面讨论陶瓷坩埚与高温合金熔体间相互作用机制和影响因素,并对通过材料结构设计、稀土氧化物掺杂等提升坩埚性能的方法进行了展望。

     

    Abstract: High-temperature alloys play a crucial role in aerospace engines, gas turbines and other high-temperature applications. During the melting process of high-temperature alloys, ceramic crucibles serve as essential containers. The interaction between the crucible and the alloy melt directly influences the alloy's purity, microstructural uniformity and service performance, while also determining the thermal stability and service life of the crucible itself. To meet the requirements for melting high-performance high-temperature alloys, it is imperative to further improve the mechanical properties, thermal conductivity, thermal stability and corrosion resistance of ceramic crucibles under high-temperature conditions. A systematic review of the development of ceramic crucibles used for high-temperature alloy smelting is prorided, which are primarily categorized into three types: oxide refractories, non-oxide refractories and oxide-non-oxide composite refractories. The service performance and modification methods of these materials are analyzed in terms of thermal stability, thermal conductivity and corrosion resistance.Strategies including composite structural design and zirconia doping for improving the thermal shock and corrosion resistance of ceramic materials are emphasized. Furthermore, the interaction mechanisms and influencing factors between ceramic crucibles and alloy melts are discussed from the perspectives of wetting, corrosion and spalling. Finally,prospects for improving crucible performance through material structural design and rare-earth oxide doping are presented.

     

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