Evaluation of mechanical reliability of zirconia-toughened alumina composites for dental implants
| Autor: | Ki-Ju Lee, Dongxu Tang, Hyung-Bong Lim, Won-Seung Cho, Chi-Hoon Lee |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Zirconia Toughened Alumina Weibull modulus Process Chemistry and Technology Sintering Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials Compressive strength Fracture toughness Flexural strength visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material |
| Zdroj: | Ceramics International. 38:2429-2436 |
| ISSN: | 0272-8842 |
| Popis: | Zirconia-toughened alumina composites containing 0–30 vol% of 3Y-TZP were fabricated by sintering at 1600 °C for 2 h in air. The effect of the 3Y-TZP content on the mechanical properties and microstructure of the alumina ceramics was investigated. The fracture toughness and biaxial flexural strength increased as the 3Y-TZP content increased. The Young's modulus decreased with 3Y-TZP content according to the rule of mixture, while the hardness showed the contrary tendency. The Weibull modulus of the Al 2 O 3 with 20 vol% 3Y-TZP composite is higher than that of alumina. The residual hoop compressive stress developed in ZTA ceramic composites probably accounts for the enhancement of strength and fracture toughness, as well as for the higher tendency of crack deflection. No monoclinic phase and strength degradation were found after low temperature degradation (LTD) testing. The excellent LTD resistance can be explained by the increased constraining force on zirconia embedded in alumina matrix. |
| Databáze: | OpenAIRE |
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