Low-temperature formation of eutectic structures by reactive flash sintering of Al_(2)O_(3)-Y_(2)O_(3) compositesOA
Reactive flash sintering(RFS)has garnered significant interest because of the simultaneous synthesis/reaction and sintering of multicomponent ceramic materials.While electric fields demonstrably accelerate reaction kinetics during RFS,the reciprocal effect of reactions on flash sintering(FS)remains unknown.In this study,the role of the solid-state reaction in the onset of FS was investigated using Al_(2)O_(3)-Y_(2)O_(3) and Al_(2)O_(3)-Y3Al5O12(YAG)as models.The results show that the onset temperature of FS of Al_(2)O_(3)-Y_(2)O_(3) is 350℃ lower than that of Al_(2)O_(3)-YAG under a constant electric field of 1000 V/cm.This demonstrates that the solid-state reaction significantly reduces the onset temperature,likely by enhancing the electrical conductivity of the sample.Remarkably,Al_(2)O_(3)-YAG ceramic composites with fine eutectic structures were prepared by RFS-ed Al_(2)O_(3)-Y_(2)O_(3) at a furnace temperature of 850℃,which is 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 eutectic ceramics.
Shu Yao;Xiang Xu;Liying Chen;Dianguang Liu;Yongsheng Liu;Ke Ren;Yiguang Wang;Jinling Liu
School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China Advanced Structural Materials Mechanical Behavior and Service Safety Key Laboratory of Sichuan Province,Chengdu 611756,China School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,ChinaSchool of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China Advanced Structural Materials Mechanical Behavior and Service Safety Key Laboratory of Sichuan Province,Chengdu 611756,China School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,ChinaSchool of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China Advanced Structural Materials Mechanical Behavior and Service Safety Key Laboratory of Sichuan Province,Chengdu 611756,ChinaSchool of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,ChinaState Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,ChinaInstitute of Advanced Structure Technology,Beijing Institute of Technology,Beijing 100081,ChinaInstitute of Advanced Structure Technology,Beijing Institute of Technology,Beijing 100081,ChinaSchool of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China Advanced Structural Materials Mechanical Behavior and Service Safety Key Laboratory of Sichuan Province,Chengdu 611756,China
化学化工
reactive flash sintering(RFS)solid-state reactiononset temperatureeutectic structuresmechanical properties
《Journal of Advanced Ceramics》 2026 (4)
P.167-176,10
financially supported by the National Natural Science Foundation of China(No.52272074)the Department of Science and Technology of Sichuan Province(No.2021JDJQ0019)the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University(NWPU)(No.SKLSP202104)the Fundamental Research Funds for the Central Universities(Nos.2682024GF011 and 2682024GF016).
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