Medizinische Universität Graz - Research portal
Selected Publication:
Kulmburg, A; Kvas, G; Wiedner, G; Golob, P; Warbichler, P; Schmied, M; Bratschko, RO.
The microstructure of Co-Cr-Mo-(Nb) dental alloys
PRAKT METALLOGR-PRACT METALLO. 2001; 38(9): 514-531.
Web of Science
- Co-authors Med Uni Graz
- Bratschko Rudolf
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- Abstract:
- SEM and TEM investigations carried out on a model dental casting alloy containing 0.4% C, 30% Cr, 5% Mo and the rest Co, and a similar alloy also containing 1% Nb which is suitable for blending with ceramic material, have shown that the apparently two phase microstructure observed under the optical light microscope is in fact much more complex that at first thought. From the energy filtered TEM pictures it was able to show that in both alloys, in addition to a block shaped a-phase, an extremely fine eutectic also exists which consists of a Co-rich solid solution together with M23C6 and M6C carbides. In addition, also arranged within the eutectic, the niobium containing alloy also contains extremely fine niobium carbonitrides. As a result of discovery of this extremely fine ternary eutectic, it is now possible to explain the extremely good casting properties of these two alloys.