TY - JOUR
T1 - Improving the surface hardness of zirconia toughened alumina (ZTA) composites by surface treatment with a boehmite sol
AU - Li, Yuanlong
AU - Kim, Hyoun Ee
AU - Koh, Young Hag
N1 - Funding Information:
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea .
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/5
Y1 - 2012/5
N2 - This paper reports a novel way of enhancing the hardness of a zirconia-toughened alumina (ZTA) composite with a zirconia content of 20 vol% by surface treatments with a boehmite sol. More specifically, a ZTA composite was first prepared by heat-treating a mixture of alumina and zirconia powders containing Cr 2O 3 and SrAl 11CrO 19, as a reinforcement at 1400 °C for 1 h, and then infiltrating them with the boehmite sol, followed by heat-treatment at 1650 °C for 1 h to densify them. This treatment led to a significant increase in the surface hardness of the ZTA composite, which was attributed mainly to an increase in the volume fraction of an alumina phase with greater hardness, whereas the flexural strength and fracture toughness decreased slightly. The Vickers hardness, flexural strength and fracture toughness were 17.1 ± 2.5 GPa, 738 ± 88 MPa and 4.2 ± 0.11 MPa m 1/2, respectively.
AB - This paper reports a novel way of enhancing the hardness of a zirconia-toughened alumina (ZTA) composite with a zirconia content of 20 vol% by surface treatments with a boehmite sol. More specifically, a ZTA composite was first prepared by heat-treating a mixture of alumina and zirconia powders containing Cr 2O 3 and SrAl 11CrO 19, as a reinforcement at 1400 °C for 1 h, and then infiltrating them with the boehmite sol, followed by heat-treatment at 1650 °C for 1 h to densify them. This treatment led to a significant increase in the surface hardness of the ZTA composite, which was attributed mainly to an increase in the volume fraction of an alumina phase with greater hardness, whereas the flexural strength and fracture toughness decreased slightly. The Vickers hardness, flexural strength and fracture toughness were 17.1 ± 2.5 GPa, 738 ± 88 MPa and 4.2 ± 0.11 MPa m 1/2, respectively.
KW - Alumina
KW - C. Mechanical properties
KW - E. Biomedical applications
KW - Zirconia-toughened alumina
UR - http://www.scopus.com/inward/record.url?scp=84858069396&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84858069396&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2011.11.062
DO - 10.1016/j.ceramint.2011.11.062
M3 - Article
AN - SCOPUS:84858069396
VL - 38
SP - 2889
EP - 2892
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 4
ER -