(PDF) Solid-State Synthesis of Calcium Carbide by Using 2.45 …
At the initial stage of the reaction, a solid layer of CaC2 starts to form at the interface of C and CaO above 1460 °C. The as-formed CaC2 layer prevents the diffusion of CaO into C. However, above 1660 °C, CaC2 and CaO forms a eutectic mixture which further promotes the diffusion of CaO and formation of CaC2.