1985 Volume 11 Issue 6 Pages 687-695
An experimental study of the temperature rise in brittle materials was carried out by use of a rotating friction mill devised to produce submicron powders by the mutual friction grinding of two specimens of the same brittle materials. Limestone, marble and talc were used as samples. The temperature rise in a cylindrical specimen at the stated working speed and load was measured by a thermocouple method. As a result of analysis by two-dimensional steady-state conduction, it was found that the temperature rise in the cylindrical specimen was proportional to the friction work. This was in accord with the experimental results. Because of this fact, the working speed and load could be explained to be in equivalent relation for the temperature rise. Also, investigation of the temperature rise distribution of the cylindrical specimen showed that it became maximum on the central axis and decreased in the radial direction. Furthermore, presuming the temperature rise on the real contact surface it was apparent that extremely high surface temperature might be developed even under moderate conditions of working speed and load. This temperature rise in brittle materials was closely related to comminution efficiency and the occurrence of mechanochemical phenomena.