Effects of Ni and Mo on the microstructure and some other properties of Co-Cr dental alloys (CROSBI ID 102067)
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Podaci o odgovornosti
Matković, Tanja ; Matković, Prosper ; Malina, Jadranka
engleski
Effects of Ni and Mo on the microstructure and some other properties of Co-Cr dental alloys
Influences of adding Ni and Mo on the microstructure of as-cast Co-Cr base alloys have been investigated in order to determine the region of their optimal characteristics for biomedical application. The alloys were produced by arc-melting technique under argon atmosphere. Using optical metalography and scanning electron micro analyser has been established that among then samples of Co-Cr-Ni alloys only samples 5 and 9 with the composition Co55Cr40Ni5 and Co60Cr30Ni10 have appropriate dendritic solidification microstructure. This microstructure, typical for commercial dental alloys, appers and beside greater number of as-cast Co-Cr-Mo alloys.The results of hardness and corrosion resistance measurements revealed the stron influence of different alloy chemistry and of as-cast microstructure. Hardness of alloys decreases with nickel content, but increases with chromium content. Therefore all Co-Cr-Ni alloys have significantly lower hardness than Co-Cr-Mo alloys. Superior corrosion characteristics have the samples with typical dendritic microstructure and higher chromium content, until nickel content have not significant effect.
Co-Cr alloys; implant alloys; mechanical properties; corrosion resistance
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