Titanium surface treatments to avoid fretting and wear
Titanium surface treatments to avoid fretting and wear
(OP)
Hello,
I have to manufacture a part in Ti6Al4V due to stiffness reasons, for a space application. Our customer told us that, due to poor resistance of this material to fretting and wear, we'd better apply a surface treatment. The suggested alternatives are anodic oxidation as per SAE AMS 2488D, hard coating with tungsten carbide or cobalt thermal spray. After a brief investigation with our suppliers I found that they don't know the AMS normative, and a possible solution could be a CrN coating, with a hardness 2500-2700 HV and a thickness of 2-3 micron. What do you think is better to use? This part must be also electrically conductive in 4 small areas: how can I treat these areas so that they are conductive? On aluminium we usually apply anodic oxidation protecting conductive areas, then we treat them with alodine.
Thanks and regards.
Marco
I have to manufacture a part in Ti6Al4V due to stiffness reasons, for a space application. Our customer told us that, due to poor resistance of this material to fretting and wear, we'd better apply a surface treatment. The suggested alternatives are anodic oxidation as per SAE AMS 2488D, hard coating with tungsten carbide or cobalt thermal spray. After a brief investigation with our suppliers I found that they don't know the AMS normative, and a possible solution could be a CrN coating, with a hardness 2500-2700 HV and a thickness of 2-3 micron. What do you think is better to use? This part must be also electrically conductive in 4 small areas: how can I treat these areas so that they are conductive? On aluminium we usually apply anodic oxidation protecting conductive areas, then we treat them with alodine.
Thanks and regards.
Marco





RE: Titanium surface treatments to avoid fretting and wear
Regards,
Cory
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RE: Titanium surface treatments to avoid fretting and wear
http://www.tiodize.com/anodizing.html
RE: Titanium surface treatments to avoid fretting and wear
Marco
RE: Titanium surface treatments to avoid fretting and wear
RE: Titanium surface treatments to avoid fretting and wear
Since this is for a space application, you may not have the luxury of using a local supplier. If you have already contacted more than one company and they are not capable of meeting the requirements of SAE AMS 2488D, then you should either use a qualified North American supplier like Tiodize, General Magnaplate, etc., or you should investigate the thermal spray coating option. Sulzer Metco will be able to perform this in Europe using a Mo-based coating.
RE: Titanium surface treatments to avoid fretting and wear
Marco