| 摘要 |
PURPOSE:To improve hardness and toughness by directly bonding specific polycrystalline diamond powder to diamond powder of single crystal. CONSTITUTION:A mixture 2 of (A) 5-95vol.% polycrystalline diamond powder having 10-100nm diameter of primary particles and 100nm-50mum diameter of secondary particle and (B) 95-5vol.% diamond powder of single crystal having 1-10mum particle diameter is sealed in a metallic capsule 1, a cover 3 bored with a hole 4 for vacuumizing is screwed into one end of the side of the capsule, the capsule 1 is evacuated through the hole 4 and the hole 4 is sealed. Then the capsule 1 is packed into a momentum trap made by combining a storage part 5 of test specimen, a ring 6 and a disc 7, embedded in clay 9, an explosive compound 15 and a plane wave generator 17 are placed through a steel plate 14 on the trap, the explosive compound 15 is exploded, the shot metallic plate or bullet is collided at >=1.8kg/second velocity when calculated under a collision condition between stainless steels SUS, a high temperature and high pressure are generated and the diamonds are sintered to give sintered material of diamond having >=85% density. |
