| 摘要 |
A cutting insert having a cutting portion comprising a dispersion of diamond crystals in a matrix of beta -silicon carbide and silicon nitride is produced by forming a first dispersion of diamond crystals evenly coated with carbon black in a temporary binder, and forming a second dispersion of carbon fiber, carbon black and filler in a temporary binder. The first and second dispersions are compacted together to produce an intermediate composite which is heated in a vacuum furnace in order to remove the temporary binder and allow liquefied silicon to infiltrate the composite. The composite is then sintered and subjected to nitrogen, wherein elemental silicon at the surface of the composite reacts with the nitrogen to produce silicon nitride.
|
