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Open AccessArticle

Effect of the Heating Rate on the Spark-Plasma-Sintering (SPS) of Transparent Y2O3 Ceramics: Microstructural Evolution, Mechanical and Optical Properties

1
Sialon Group, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
2
Ceramics Processing Group, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
3
Field-Assisted Sintering Group, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
*
Author to whom correspondence should be addressed.
Ceramics 2021, 4(1), 56-69; https://doi.org/10.3390/ceramics4010006
Received: 7 December 2020 / Revised: 22 January 2021 / Accepted: 16 February 2021 / Published: 17 February 2021
(This article belongs to the Special Issue Spark Plasma Sintering Technology)
High strength transparent Y2O3 ceramics were fabricated from commercial powders using spark plasma sintering (SPS) technique by optimizing the heating rate. The heating rate significantly influenced the microstructures and the optical/mechanical properties of the Y2O3 ceramics. Grain growth was limited accordingly with increasing the heating rate. The ball milling process of the commercial Y2O3 powders is likely to further enhance the sinterability during the SPS processing. The dense Y2O3 ceramics, which were sintered by SPS with 100 °C/min, showed good transmittance range from visible to near infrared (IR). For a high heating rate of 100 °C/min, the in-line transmittance at a visible wavelength of 700 nm was 66%, whereas for a slow heating rate of 10 °C/min, it reduced to 46%. The hardness Hv tends to increase with increasing the heating rate and rigorously followed the Hall–Petch relationship; that is, it is enhanced with a reduction of the grain size. The toughness KIC, on the other hand, is less sensitive to both the heating rate and the grain size, and takes a similar value. This research highlighted that the high heating rate SPS processing can fabricate fully dense fine-grained Y2O3 ceramics with the excellent optical and mechanical properties. View Full-Text
Keywords: Y2O3; transparent ceramics; spark plasma sintering; optical properties; mechanical properties; heating rate Y2O3; transparent ceramics; spark plasma sintering; optical properties; mechanical properties; heating rate
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MDPI and ACS Style

Liu, L.; Morita, K.; Suzuki, T.S.; Kim, B.-N. Effect of the Heating Rate on the Spark-Plasma-Sintering (SPS) of Transparent Y2O3 Ceramics: Microstructural Evolution, Mechanical and Optical Properties. Ceramics 2021, 4, 56-69. https://doi.org/10.3390/ceramics4010006

AMA Style

Liu L, Morita K, Suzuki TS, Kim B-N. Effect of the Heating Rate on the Spark-Plasma-Sintering (SPS) of Transparent Y2O3 Ceramics: Microstructural Evolution, Mechanical and Optical Properties. Ceramics. 2021; 4(1):56-69. https://doi.org/10.3390/ceramics4010006

Chicago/Turabian Style

Liu, Lihong; Morita, Koji; Suzuki, Tohru S.; Kim, Byung-Nam. 2021. "Effect of the Heating Rate on the Spark-Plasma-Sintering (SPS) of Transparent Y2O3 Ceramics: Microstructural Evolution, Mechanical and Optical Properties" Ceramics 4, no. 1: 56-69. https://doi.org/10.3390/ceramics4010006

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