caa a22 4500 463222938 CHVBK 20180405153218.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-1444-2 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1444-2 Fracture strength of ion-exchange silicate-containing dental glass ceramics [Elektronische Daten] [Tzer-Shin Sheu, David Green] Dental glass ceramics with the composition of (0.2K, 0.8Na)2O-xAl2O3-ySiO2 (x=0.4-0.8, y=4-6) were studied for their mechanical properties. Different ion-exchange practices were used to modify the sub-surface concentration distributions of K+, Na+, and H+ of these glass ceramics. Specimens were heat-treated in molten KNO3, and NaNO3+KNO3 salt baths at 350-450°C for the ion exchanges of K+ and Na+, or in the 4% acetic aqueous solution at 85°C for a hydration treatment. Some glass ceramics contained a feldspar crystalline phase, which was not affected by different ion-exchange practices. Specimens with a single ion-exchange process or with the hydration treatment had higher flexural strength than those without either of these two treatments. For double ion-exchange specimens, the flexural strength increased with decreasing ion-exchange temperature. The double ion-exchange specimens had flexural strength up to 280MPa, which was slightly lower than that of the single ion-exchange specimens, but much higher than that of the as-annealed specimens. However, the Weibull modulus of these double ion-exchange specimens was 5-8 because of the presence of large defects. For further increasing mechanical reliability, silicate-containing dental glass ceramics were required to have appropriate flaw controls and ion-exchange processes. Springer Science+Business Media, LLC, 2007 Sheu Tzer-Shin Department of Materials Science and Engineering, I-Shou University, 1, Section 1, Hsueh-Cheng Rd, Tai-Hsu Hsiang, Kaohsiung, Taiwan aut Green David Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 2064-2069 0022-2461 42:6<2064 2007 42 10853 https://doi.org/10.1007/s10853-006-1444-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1444-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sheu Tzer-Shin Department of Materials Science and Engineering, I-Shou University, 1, Section 1, Hsueh-Cheng Rd, Tai-Hsu Hsiang, Kaohsiung, Taiwan aut NATIONALLICENCE 700 1- Green David Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 2064-2069 0022-2461 42:6<2064 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer