Gordon England Surface Engineering Forum



Re: one more question: friction coefficient of WC-12Co coating

Posted by Gordon England (62.252.0.12) on 16:04:56 13/04/05

In Reply to: one more question: friction coefficient of WC-12Co coating posted by Arturas

: I would like to know how friction coefficient of WC-12Co coating depends on sliding speed, load and temperature. Is it constant value or not?
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: : The coefficientnof friction is dependent on many factors, including those you mention plus lubrication (oil, water, dirt etc.), surface finish, counter surface material and properties etc. So the value is not constant unless you apply the exact same test conditions every time.
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: : Regards Gordon
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: Sorry if my question wasn t full. I would like to get more exact information about friction coefficient. If WC-12Co coating surface finish, counter surface material and properties etc. are constant in all cases (surfaces are cleaned by alcohol) and I am changing only load. How coefficient of friction will change, and after that how does it change after increasing sliding speed (in my cases from 0.3m/s to 1.5m/s) .
: "I got that friction coefficient of WC-12Co coating with increasing load decrease from 1 up to 0.5 (I am increasing load from 30N uo to 150N). And with increasing sliding speed - 1 (speed 0.3m/s) up to 0.7 (speed 1.5m/s)" Is it normal or not ?
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: Thank you

Friction coefficient/load or speed relationship is rarely constant. So this effect is probably normal in your situation. Under lubricated conditions you may find the effect is reversed.

Regards Gordon


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