Low-Temperature Degradation Behaviour and Mechanical Properties of a 3Y-TZP Manufactured from Detonation-Synthesized Powder

被引:7
作者
Kern, F. [1 ]
Lindner, V. [1 ]
Gadow, R. [1 ]
机构
[1] Univ Stuttgart, IFKB, Stuttgart, Germany
来源
JOURNAL OF CERAMIC SCIENCE AND TECHNOLOGY | 2016年 / 7卷 / 04期
关键词
Zirconia; mechanical properties; phase composition; microstructure; low-temperature degradation; Y-TZP; ZIRCONIA CERAMICS; NANOSTRUCTURED POWDERS; STABILIZED ZIRCONIA; FRACTURE-TOUGHNESS; TETRAGONAL ZRO2; GRAIN-SIZE; TRANSFORMATION; INDENTATION; STRENGTH;
D O I
10.4416/JCST2016-00036
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In recent years, yttria-stabilized zirconia Y-TZP has attracted considerable interest in the field of dental restoration. However, the state-of-the-art Y-TZP materials made from coprecipitated powders only just comply with the current standard in terms of fracture resistance and grain size. In this study a new nanoscale starting powder produced with detonation synthesis was applied to produce a fully dense specimen by means of hot pressing in the sintering temperature range between 1250 - 1500 degrees C. Mechanical properties, microstructure and phase composition were studied. Low temperature degradation behavior was quantified in an accelerated ageing test in a saturated water vapor at 134 degrees C. Between sintering temperatures of 1300 degrees C and1400 degrees C, the materials obtained show a combination of high strength > 1400 MPa, toughness of 6 MPa root m and fine grain size < 320 nm and thus fulfill the requirements of the dental standard EN ISO 6872. Ageing resistance was high. After nucleation of the monoclinic content, the materials exhibited zero-order growth kinetics and retained > 90 % tetragonal phase up to ageing times of 10 h approximate to 35 years in vivo.
引用
收藏
页码:313 / 321
页数:9
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