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.