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Sintering behavior, microstructural evolution, and mechanical properties of ultra-fine grained alumina synthesized via in-situ spark plasma sintering

Title
Sintering behavior, microstructural evolution, and mechanical properties of ultra-fine grained alumina synthesized via in-situ spark plasma sintering
Authors
Lee, KT[Lee, Kang Taek]Cha, SI[Cha, Seung Ii]Kim, KT[Kim, Kyung Tae]Lee, KH[Lee, Kyung Ho]Hong, SH[Hong, Soon Hyung]
DGIST Authors
Lee, KT[Lee, Kang Taek]
Issue Date
2016-02-15
Citation
Ceramics International, 42(3), 4290-4297
Type
Article
Article Type
Article
Keywords
Abnormal Grain GrowthAluminaAluminumAmorphousAmorphous MaterialsFracture ToughnessGrain GrowthGrain Size and ShapeHigh Relative DensitiesMicro-Structural EvolutionMicro-Structural FeaturesPowdersSintered AluminaSinteringSintering BehaviorsSintering ConditionSitu Spark Plasma SinteringSpark Plasma SinteringUltra-Fine-GrainedUltra-Fine Grain Size
ISSN
0272-8842
Abstract
Ultra-fine grained Al2O3 was fabricated by in-situ spark plasma sintering (SPS) process directly from amorphous powders. During in-situ sintering, phase transformation from amorphous to stable α-phase was completed by 1100 °C. High relative density over 99% of in-situ sintered Al2O3 was obtained in the sintering condition of 1400 °C under 65 MPa pressure without holding time. The grain size of in-situ sintered Al2O3 body was much finer (~400 nm) than that of Al2O3 sintered from the crystalline α-Al2O3 powders. For in-situ sintered Al2O3 from amorphous powders, we observed a characteristic microstructural feature of highly elongated grains in the ultra-fine grained matrix due to abnormal grain growth. Moreover, the properties of abnormally grown grains were controllable. Fracture toughness of in-situ sintered Al2O3 with the elongated grains was significantly enhanced due to the self-reinforcing effect via the crack deflection and bridging phenomena. © 2015 Elsevier Ltd and Techna Group S.r.l.
URI
http://hdl.handle.net/20.500.11750/2293
DOI
10.1016/j.ceramint.2015.11.106
Publisher
Elsevier Ltd
Related Researcher
  • Author Lee, Kang Taek Advanced Energy Conversion and Storage Lab(AECSL)
  • Research Interests
Files:
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Collection:
Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles


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