TY - JOUR
T1 - Effect of the heating rate on the spark-plasma-sintering (Sps) of transparent y2 o3 ceramics
T2 - Microstructural evolution, mechanical and optical properties
AU - Liu, Lihong
AU - Morita, Koji
AU - Suzuki, Tohru S.
AU - Kim, Byung Nam
N1 - Funding Information:
Funding: This research was funded by Innovative Science and Technology Initiative for Security, ATLA, Japan, grant number No. JPJ004596.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/3
Y1 - 2021/3
N2 - High strength transparent Y2 O3 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 Y2 O3 ceramics. Grain growth was limited accordingly with increasing the heating rate. The ball milling process of the commercial Y2 O3 powders is likely to further enhance the sinterability during the SPS processing. The dense Y2 O3 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 Y2 O3 ceramics with the excellent optical and mechanical properties.
AB - High strength transparent Y2 O3 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 Y2 O3 ceramics. Grain growth was limited accordingly with increasing the heating rate. The ball milling process of the commercial Y2 O3 powders is likely to further enhance the sinterability during the SPS processing. The dense Y2 O3 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 Y2 O3 ceramics with the excellent optical and mechanical properties.
KW - Heating rate
KW - Mechanical properties
KW - Optical properties
KW - Spark plasma sintering
KW - Transparent ceramics
KW - Y O
UR - http://www.scopus.com/inward/record.url?scp=85112749961&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85112749961&partnerID=8YFLogxK
U2 - 10.3390/ceramics4010006
DO - 10.3390/ceramics4010006
M3 - Article
AN - SCOPUS:85112749961
VL - 4
SP - 56
EP - 69
JO - Ceramics
JF - Ceramics
SN - 2571-6131
IS - 1
ER -