TUFRAM® is a surface treatment method developed to improve the surface properties of aluminium and itsalloys. The process combines the properties of hard anodising and coating with fluorocarbons resulting in improved properties in a number of aspects:
- High hardness
- High corrosion resistance
- Non galling properties
- Close dimensions
- Good electrik isolation
- High wear resistance
- Low coefficient of friction
- Non-stick properties
- Uniform coating thickness
- No post machining
There are various coatings within the TUFRAM® family, all featiring the combination of properties but each of them optimised to one, or some, of them.
TUFRAM® L – 4
Highest hardness and wear recistance combined with good friction properties.
TUKRAM® H – 0*
Good non-stick properties, hardness and wear resistance
TUFRAM® R 66*
Best non-stick properties aspecially against rubber and urethane.
Highest corrosion resistance combined with hardness and wear resistance.
Best dry lubrication by a combination of MoS2 / PTFE coating, together with high hardness and wear resistance.
High hardness and wear resistance with good friction properties combined with hight dielectric strength, >2000 V at 50 um coating thickness in dry environment.
* The fluorocarbons used in the process are approved for the use in food and drug industry bu the US Food & drug Administration and the USDA.
Aluminium oxide, which the TUFRAM® coating mainly consists of, is next to diamond the hardest non-synthetic material, in its hardest form, >VHN 2000, and a hardness of well over VHN 1000 in its softer structural form. The hardness in the coating is however lower due to a certain microporosity. Depending on coating thickness and aluminium alloy coated, the hardness varies between VHN 400 and VHN 600.
Schematic illustration of TUFRAM® coating