Heat treatment of copper
Heat treatment of copper
(OP)
A 0,25mm copper braid consisting of 0,08mm strands is heated to 220°C for 35 minutes which causes the surface to take a golden hue.
The material feels the same, but still I would like to know what causes the color change and if it influences the ability to bend and withstand vibrations.
NSV
The material feels the same, but still I would like to know what causes the color change and if it influences the ability to bend and withstand vibrations.
NSV





RE: Heat treatment of copper
There is also some natural coloration of the copper oxides, Cu2 being ~pink and CuO being black.
*0.2 microns per table here:
ht
RE: Heat treatment of copper
take it that I can use
the braid as before,
without worrying about
increased brittleness.
NSV
PS What happens to the
text editor in this
thread? I can see only
the left half of the
page
RE: Heat treatment of copper
color chart is cool!
NSV
RE: Heat treatment of copper
The oxide coating increases the overall wire diameter by about 0.1%, with the copper core diameter decreasing by about 0.1%. There will be a slight decrease in mechanical properties; surface oxide films are brittle and reduce fatigue properties.
Also, the thermal emissivity of copper wire is increased by surface oxidation.
I apologize for the oversized interference color chart; the smaller ones I found last night were illegible & couldn't find the earlier thread. The ones in the following thread are more straightforward
Blueing steel parts
thread818-144274