The dental material
Cobalt-chromium is an alloy that is mainly used in the sector of dentistry and prosthetics. At FKM, this alloy is available in powder form according to DIN EN ISO 9693 / DIN EN ISO 22674, type 5. In dentistry, risk-free alloys such as CoCrW are in great demand. This is especially due to reasons regarding greater economic efficiency. 3D printing with cobalt-chromium using selective laser melting (SLM) is significantly more cost-efficient than comparable pure ceramic dentures.
CoCrW is a cobalt-chromium-wolfram alloy. The chemical composition is 60.5% cobalt (Co), 28% chromium, 9% wolfram, 1.5% silicon and less than 1% of other elements (manganese Mn, nitrogen N, niobium Nb, iron Fe).
This special CoCrW alloy is free of nickel, beryllium and gallium, as their use on patients would be toxicologically critical. The alloy is therefore biocompatible and can be used safely in dental prosthetics, as confirmed by extensive in vitro toxicity tests. The microstructure of components made of CoCrW has a very homogeneous and dense structure, ideal for dental technology.
The advantages at a glance
- very good machinability
- excellent for use in (dental) medicine
- high density
- highly corrosion resistant
|Yield strength Rep0,2||635 N/mm²|
|Tensile strength Rm||1030 N/mm²|
|Elongation at break A5||10 %|
|Modulus of elasticity||230.000 N/mm²|
|Melting interval ∆||1320 – 1420°C|
|Density ρ||8,6 g/cm³|
|CTE (25-500°C)||14,1 x 10-6K-1|
Possible applications of cobalt-chromium
Due to its biocompatibility and very good machinability, 3D printing with cobalt-chromium is particularly suitable in the dentistry sector. Thanks to laser melting, accurately fitting crowns, bridges or frameworks for metal-ceramic veneers can be printed for specific patients in a short time. 3D printing with cobalt-chromium also plays a major role in combined dentures.