Copper practically does not interact with carbon. Everything is determined by the temperature of the process, if we consider the method of powder metallurgy. I have been researching this issue for a long time. If it will be interesting to talk, write to the mail: [email protected].
Thank you H. Y. Rostova for the useful references. I could not find/access the full-length article M.B. Bever and C.F. Floe: Trans. AIME, vol. 166, pp. 128-141 (1946). It'll be very helpful if you could send me the downloaded copy so that I could read.