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Inspect surface roughness finish at high temperature

Inspect surface roughness finish at high temperature

Inspect surface roughness finish at high temperature

We have been using the Testex tape and dial indicator to measure and validate the surface roughness of steel.  The Testex tape has a maximum working temperature of 150F and we need to measure the surface roughness on a slightly curved surface at temperatures of 300 F.  If I use a thin aluminum or brass foil and use rubbing to transfer the profile of the curved surface to the foil, will I get a good reading?

RE: Inspect surface roughness finish at high temperature

Seems to me an easy way to verify is to use the foil and tape on a cold surface and compare results.  If you believe the foil will react differently at higher temperatures, again run a sample but use foil at 300 degrees, let specimen cool, use tape and compare results.

RE: Inspect surface roughness finish at high temperature

Does surface roughness change with temperature over such a small range?

Just curious as to why- grain structure?

"It's the questions that drive us"

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