Pro/Forums - View Single Post - Metallurgist? Copper annealing discussion.

koslov · 08-04-2003, 06:01 PM

Sorry, my Digitec 5810 broke a few weeks ago, and I have yet to find an affordable replacement. So I have no means of accurate testing.

I annealed the copper for about 1hr at 1400F, and it came out red hot. Unfortunately, it quickly became covered in carbon as it cooled in the open air; the block was jet black (at least, I think the ambient air was the source of carbon, because the container was filled with argon during heating). And the base definitely deformed a bit: there are some tiny bumps where the copper seeped into the pores of the ceramic plate.

Should I measure electrical conductivity with an ohmmeter and identical strips of annealed and hard-drawn copper? Then I can simply use the Wiedemann-Franz Ratio to compute thermal conductivity.

08-04-2003, 06:01 PM	#94
koslov Cooling Savant Join Date: Jul 2002 Location: Posts: 264	Sorry, my Digitec 5810 broke a few weeks ago, and I have yet to find an affordable replacement. So I have no means of accurate testing. I annealed the copper for about 1hr at 1400F, and it came out red hot. Unfortunately, it quickly became covered in carbon as it cooled in the open air; the block was jet black (at least, I think the ambient air was the source of carbon, because the container was filled with argon during heating). And the base definitely deformed a bit: there are some tiny bumps where the copper seeped into the pores of the ceramic plate. Should I measure electrical conductivity with an ohmmeter and identical strips of annealed and hard-drawn copper? Then I can simply use the Wiedemann-Franz Ratio to compute thermal conductivity.