超硬工具の熱起電力特性について

抄録

The tool/work thermocouple technique has been used to determine the temperatures reached by metal-cutting tools under various conditions. This method requires an exact calibration curve for the materials used. An earlier report showed that the calibration curve was affected by variations of the carbide mixture, the cobalt content, the size of the carbide tips and the others. However, the influence of the Co binder upon E. M. F. may be more essential than those factors. Because the lattice constant of Co binder is considered to be the main result due to the composition and manufacturing method of tungsten carbide. The various factors upon the E. M. F. output are examined using the specially prepared tungsten carbide tips.
The results obtained are as follows :
(1) The thermoelectric properties of the carbide tools are almost independent upon the variations of the carbide mixture, the cobalt content, and the size of the carbide tips, but strongly dependent upon the lattice constant of binder phase.
(2) The E. M. F. output of the alloys containing TiC is smaller than that of the WC-Co alloys on the same temperature.