| Autor: |
Gibbesch, B., Elssner, G., Petzow, G. |
| Předmět: |
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| Zdroj: |
International Journal of Oral & Maxillofacial Implants; Summer1989, Vol. 4 Issue 2, p12-24, 13p, 7 Black and White Photographs, 1 Diagram, 2 Charts, 2 Graphs |
| Abstrakt: |
The microstructure of Ti-Ta and Ti-Nb alloys diffusion bonded to a 99.7 wt% Al2O3 ceramic for dental implants is subdivided into a reaction double layer containing the phases TiAl and Ti3Al, a transition region of coarse α-Ti plates in β-Ti, and the unaffected bulk metal, the α-Ti/β-Ti structure of which can be refined by annealing at 800 °C for 1 hour after bonding. Optimized joints fabricated by diffusion bonding in a high vacuum at 1,200 °C from a 99.7 wt% Al2O3 ceramic and Ti-Ta alloys fitted in their thermal contraction behavior to that of the ceramic by the addition of 30 to 40 wt% Ta showed a fracture resistance of 2.3 MN/m3/2. Approximately 80% of the bend test specimens notched at the Ti-Ta/alumina interface failed by crack extension parallel to the interface within the ceramic, which is typical for a metal-ceramic bond of high to medium interfacial strength. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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