Gordon England Surface Engineering Forum



Re: Hardness Testing

Posted by Gordon England (62.252.0.5) on 21:05:05 13/10/04

In Reply to: HArdness Testing posted by Kaushal

: Dear Vasco,

: We have requirement of Plasma Coating on Aluminium Roller , Alloy 6066 and Temper T6 having hardness exceeding 1200 VPN , surface finish to be Ra 0.8 . Significance of this is to ensure smooth movement of HDPE tapes over coating at a speed of 440 mtr / min. Since Plasma Coating is black in colour and the Vicker hardness can be measured by indenting a pyramid shaped indicator the rhombus indentation is unclear and so its difficult to calculate VPN.

: Please guide us in detail since our development of new item depends a lot on this.

I guess you are referring to a plasma spray ceramic coating probably chromium oxide or alumina/titania. You will ideally need a Vickers microhardness tester for this, using a 0.3 or 1 kgf force on a good metallographic quality polished surface.

Hope this helps

Regards Gordon


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