| 摘要 |
A process for the preparation of an extrahard material based on tungsten and molybdenum carbides and having a hexagonal crystal structure identical with that of tungsten carbide. According to this process, one heats between 1000 DEG C and a temperature T<ux>u, which is lower than the maximum stability limit of the Mo<ux>uW<u1-x>uC phase wherein 0.01 x 1, a mixture, intimate to the molecular or atomic scale, of tungsten and molybdenum the total content of which in Fe, Ni and Co does not exceed 0.1% with carbon and/or a carbon compound. T<ux>u is defined as follows: For 0.01 < x < 0.8, T<ux>u = 2700 - 1375x`C; For 0.8 < x < 1, T<ux>u = 3400 - 2250x`C. |
