Abstract
Cr1-xMoxB2 ceramics were manufactured by hot-pressing at the temperatures between 1600 and 1900°C. CrB2, Mo and amorphous boron powders were mixed in selected ratios. The ceramics were characterized by lattice constants, density and hardness.
The X-ray diffraction data showed that the molybdenum solubility x into the ceramics is about 0.6 at the temperatures of 1600-1800°C and increases to about 0.8 at 1900°C. Apparent density of the ceramics increased as molybdenum content and hot-pressing temperature increased. SEM observations showed that boride grains in the ceramics grows rapidly over the hot-pressing temperature of 1800 °C . Vickers hardness of the ceramics is a function of hot-pressing temperature and molybdenum content, and reached maximum value of 26.5GPa at 1700°C and x=0.6.
