| 摘要 |
<p>Abrasive particles are made by selecting superhard core particles from diamond, cubic boron nitride, crushed diamond composites and crushed cubic boron nitride composites. The core particles are coated with a thin outer metal layer e.g. titanium. Then the particles are pelletized with a hard metal powder mixture. Metal-bonded nitrides, metal-bonded borides, metal-bonded silicon carbides, metal-bonded diamond power may also be used; nitriding of the outer layer may be obtained by sintering in a nitrogen atmosphere; carbide formation could be achieved by adding graphite powder to the mixture before pelletizing. The green pellets are sintered to yield abrasive pellets which may be incorporated in tools using a suitable bond such as a resin, metal or vitreous bond.</p> |
