I am working on interaction of copper with steel. Kindly let me know, what type of chemical bonding occurs between copper and steel at high temperature. adhesive bonding or any other ?
As per my view it is diffusion bonding . I am not sure about the size of cu or Fe, which one is smaller,
You have to specify the temperature and composition of the steel that we know what type of phase may form between copper- steel diffusion couple. The diffusion bonding is good terminology. Some times it is cold weld interface especially in diffusion studies.
In the specified temperature range this is a hypoeutectoid steel having austenitic structure (FCC), and it may have the solid solubility of copper up to about Cu 7% at. in the austenitic steel matrix compared to the Fe4.6% at. solubility of iron in copper matrix at the diffusion couple zone according to the extrapolation from Fe-Cu phase diagram. My experience tells me that you may have genuine diffusion bond at that temperature range. Actually you will have a layer of copper rich iron phase which is in contact with steel matrix at the Matano interface having diffused copper substitutional solid solution with a well defined concentration profile. The penetration depth kinetics is solely control by the intrinsic diffusivity of copper in Iron matrix but not the diffusion kinetics of Fe.
This is noting to do with intermetallic but rather copper rich alpha Cu-Fe terminal solid solution with a composition in the range of Cu at% 96.0-98.0 for a temperature range of 1090-950 C. as you may see from the Cu-Fe phase diagram from Google.
Actually there should be barely seen peritectic reaction occurring at 1065 C for at. %95.4 Cu peritectic composition where liquid composition is about 96.5 at% Cu and iron rich Gama Fe-Cu terminal solid solution composition is about at 7.3% Cu.
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