High Pressure Sintering Behavior of B_6O-Based Composites
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Super-hard sintered composites in the systems of B<SUB>6</SUB>O-B<SUB>4</SUB>C and B<SUB>6</SUB>O-cBN were prepared by high pressure sintering of composite powders containing in-laboratory synthesized B<SUB>6</SUB>O powder. Nearly fully dense sintered composites were obtained under the high pressure and temperature treatment conditions of 3-6 GPa, 1500-1800°C and 10-30 min. Vickers microhardness of the sintered composites ranged form 3000 to 4600 kg/mm<SUP>2</SUP> depending on the composition and sintering conditions. The fracture toughness of the B<SUB>6</SUB>O-cBN system which was higher than that of the B<SUB>6</SUB>O-B<SUB>4</SUB>C system, was observed by the enhanced crack propagation along the grain boundary between B<SUB>6</SUB>O and cBN.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 986-988, 1998
The Japan Society of High Pressure Science and Technology