7075 alumimium gear coating 1

[petersi]

I'm looking for a coating treatment to lower Friction and Wear on this alu gear. This gear runs with nylon spur gear. Please advice and thanks so much.

 

[TVP]

Aluminum can be anodized to provide a smooth, hard surface that is subsequently treated with PTFE for low friction. HC-PLUS or HC-PLUS 2 from AHC Oberflächentechnik GmbH are two examples:

http://www.ahc-surface.com/en/surface-treatment/processes/hart-coat®/

Diamond Like Carbon coatings deposited by PACVD are another possibility.

http://www.hauzertechnocoating.com/en/plasma-coating-explained/dlc-coating/

http://www.sulzer.com/en/Products-and-Services/Coating-Services/DLC-Coatings/Processes/PACVD

 

[mfgenggear]

petersi

please advise the AGMA quality of the gears in mesh?
how important is the Total Composite Error or Total Index Variation?
not enough info given.

TVP

I do not normally recommend Anodize on a gear tooth profile. but may be chromic or sulfuric acid anodize or dry film?


Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.

 

[TVP]

mfggeareng,

I agree with you that anodized aluminum is not a good solution for gears that have high contact stresses, especially if the mating part is steel. I am guessing that this is a low load, low speed gear based on the mating part being nylon, so perhaps anodizing + dry film lubricant can reduce friction and provide acceptable durability.