Demonstrates that solid-state reactions lower critical flash temperature in Al2O3-Y2O3 composites, indicating enhanced sintering efficiency.
Reactive flash sintering (RFS) has garnered significant interest because of the simultaneous synthesis/reaction and sintering of multi-component ceramic materials. While electric field demonstrably accelerates reaction kinetics during RFS, the reciprocal effect of reactions on flash sintering (FS) remains unknown. In this study, the role of solid-state reaction in the onset of FS was investigated using Al₂O₃-Y₂O₃ and Al₂O₃-Y₃Al₅O₁₂ (YAG) as models. The results show that the critical flash temperature of FS for Al₂O₃-Y₂O₃ is 350°C lower than Al₂O₃-YAG under a constant electric field of 1000 V/cm. It demonstrates that the solid-state reaction significantly reduces the critical flash temperature, likely by enhancing the electrical conductivity of sample. Remarkably, Al₂O₃-YAG ceramic composites with fine eutectic structure were prepared by RFS-ed Al₂O₃-Y₂O₃ at a furnace temperature of 850°C far below the eutectic temperature. The resultant eutectic ceramics exhibited mechanical properties comparable to those of conventionally solidified counterparts. RFS is expected to be an energy-efficient and sustainable sintering technology to fabricate high-performance structural ceramics.
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Yao et al. (2026) studied this question.
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