3069.     SCHENCK, R., KURZEN, F., AND WESSELKOCK, H.  [Studies of Carbides Prepared With Methane.  I.]  Ztschr. anorg. Chem., vol. 203, 1931, pp. 159-187. Chem. Abs., vol. 26, 1932, p. 1536.

        Formation and composition of the carbides of Fe, Cr, W, Mo, and Re are followed by analysis of the CH₄ and H₂ gases in equilibrium over the carbide.  Results with Fe justify the method Cr at 600°, 700° and 800° forms a carbide, Cr₅C₂, and a mixed crystal phase containing 11.5% C (probably containing Cr₃C₂).  W forms the stable WC at 800°.  At 700°, the unstable W₅C₂ is observed as well as a mixed crystal phase, the composition of the higher carbide being uncertain.  Mo forms the single stable Mo₂C at 800° and the metastable phase MoC at 700°.  The reaction of CH₄ with Re is too slight for definite observation.