Effects of Ni and Mo on the microstructure and some other properties of Co–Cr dental alloys

Matković, Tanja; Matković, Prošper; Malina, Jadranka

doi:10.1016/j.jallcom.2003.07.004

Cited by 106 publications

(77 citation statements)

References 5 publications

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“…A "light" phase has fcc-structure and etched difficulty, as a nobler phase. On the contrary, a "dark" phase etched easier, as a less noble phase that has hcp-structure [17,18]. All samples with similar chemical composition have this type of microstructure, which is typical for commercial dental alloys.…”

Section: Discussionmentioning

confidence: 91%

“…However, alloy 9 has also shown a good corrosion resistance, but its microstructure differs slightly (Fig. 5) from that of sample 3 which can be ascribed to the difference in the chemical composition of darker and lighter phase [17] and to the bigger difference of potentials between these two phases [16]. Also, such chemical behaviour of examined alloys can be connected to the content of constituents (Co, Cr, Mo) from which each has its own electrochemical behaviour [19].…”

Section: Discussionmentioning

confidence: 94%

“…4). It consists of dendrites (light) and interdendritic region (dark), with two types of Co-Cr-Mo solid solutions, which differ in structure [16]. A "light" phase has fcc-structure and etched difficulty, as a nobler phase.…”

Section: Discussionmentioning

confidence: 99%

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Passivity of Co-Cr-Mo alloys in lactic acid solutions

Hadžipašić¹,

Malina²,

Matković³

2010

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The method of potentiodynamic polarization was used to obtain the electrochemical measurements of ten experimental Co-Cr-Mo alloys with different chemical composition in two solutions of 0.1 % lactic acid (LA): medium A containing Cl − -ions (0.1 % LA in artificial saliva, pH 6.52) and medium B without Cl − -ions (0.1 % LA in distilled water, pH 2.99). These solutions as representative of oral cavity conditions were chosen in order to see if the alloys could be used in dental practice. Wironit was used as reference material.In vitro experiments have shown that susceptibility to local corrosion was more pronounced in solution A. In contrast, the tendency to general corrosion was greater in solution B.Referring to pitting potential of Wironit , samples 3 (Co55CR40Mo5), 6 (Co60CR30Mo10) and 9 (Co55CR20Mo25) have shown the best performances with the highest Epitt value in both media. The same is valid for these three alloys if general corrosion was considered.K e y w o r d s : Co-Cr-Mo dental alloys, passivity, lactic acid, artificial saliva, corrosion properties

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 94%

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Passivity of Co-Cr-Mo alloys in lactic acid solutions

Hadžipašić¹,

Malina²,

Matković³

2010

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“…The size and distribution of the carbides in the alloy have a significant effect on the mechanical properties and wear resistance. 2,7 Chromium has the highest affinity to carbon, so initially chromium carbide was formed -Cr 23 C 6 . The formation of these carbides decreases the content of the unbound chromium applicable to the formation of the passive layer that protects the material against corrosion.…”

Section: Introductionmentioning

confidence: 99%

Influence of alloying elements on the mechanical properties of a cobalt-based alloy produced with powder metallurgy

Nová¹,

Novák²,

Dvorský³

2017

Mater. Tehnol.

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This work was focused on studying the effect of alloying elements on the mechanical and tribological properties of cobalt alloys. The Co-Cr-Mo alloy has been successfully used for the production of orthopaedic implants thanks to a better wear resistance than that of titanium implants. However, with the development of scientific and technological processes, there is still an ongoing effort to further improve the wear resistance and other properties of cobalt-based alloys. The aim of this research was to find a suitable alloying element, which would increase the wear resistance, while the other characteristics remain unimpaired. When choosing such an element, we have to keep in mind that it has to be non-toxic for the human body. The standard Co-Cr-Mo alloy and Co-Cr-Mo alloy with various alloying elements, specifically Nb, Si, Ti in an amount of 5 % mass fraction, were prepared using mechanical alloying followed by the compacting method called spark-plasma sintering. The influences of the alloying elements on the microstructure as well as mechanical and tribological properties were observed. Based on the obtained results, the Co-Cr-Mo-Nb alloy seems to be most suitable because the addition of niobium greatly improved the wear resistance. However, it is necessary to perform many other tests, especially the tests of corrosion resistance and biocompatibility. Keywords: cobalt alloy, biomaterial, mechanical properties, wear resistance Delo je bilo osredoto~eno na preu~evanje vpliva legirnih elementov na mehanske in tribolo{ke lastnosti kobaltnih zlitin. Co-Cr-Mo zlitina je bila uspe{no uporabljena za izdelavo ortopedskih implantantov, zahvaljujo~bolj{i odpornosti proti obrabi, kot jo nudijo vsadki iz titana. Vendar z razvojem znanstvenih in tehnolo{kih procesov {e vedno potekajo prizadevanja za izbolj{anje odpornosti proti obrabi in izbolj{anje drugih lastnosti zlitin na osnovi kobalta. Cilj raziskave je bil najti primerno prime{ani element, ki bi pove~al odpornost proti obrabi, medtem ko druge lastnosti ostajajo nedotaknjene. Pri izbiri takega elementa, moramo imeti v mislih, da mora biti nestrupen za~love{ko telo. Standardna Co-Cr-Mo zlitina in tudi Co-Cr-Mo zlitina z razli~nimi legirnimi elementi, zlasti Nb, Si, Ti, v 5 % masnem dele`u, sta bili pripravljeni s sintranjem. Opa`en je bil vpliv legirnih elementov na mikrostrukturo, kot tudi mehanskih in tribolo{kih lastnosti. Na osnovi dobljenih rezultatov se zdi, da je Co-Cr-Mo-Nb zlitina najbolj primerna, saj je dodatek niobija zelo izbolj{al odpornost proti obrabi. Vendar pa je potrebno izvesti {e {tevilne druge teste, zlasti preizkuse odpornosti proti koroziji in biokompatibilnost. Klju~ne besede: kobaltna zlitina, biolo{ki material, mehanske lastnosti, odpornost proti obrabi

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“…[2]. Many properties of the alloys originate from the crystallographic nature of cobalt, the solid solution strengthening effect of chromium and alloying elements, the formation of extremely hard carbides and the corrosion resistance imparted by chromium [3][4][5]. The defects of dental cast alloys include mainly shrinkage porosity, inclusion, micro-crack and dendritic structure.…”

Section: Introductionmentioning

confidence: 99%