| 摘要 |
The present invention is directed to sintered polycrystalline CBN/diamond conjoint compacts which are unsupported, fabricated in the substantial absence of catalyst/sintering aid material, and exhibit CBN crystal-to-crystal bonding. The absence of catalyst/sintering aid material should make these conjoint masses fully dense and thermally-stable. The unsupported, sintered CBN/diamond conjoint compacts disclosed herein can be fabricated by subjecting a mixture of CBN or a CBN-forming material, and diamond particles in the substantial absence of catalyst/sintering aid material to HP/HT conditions for forming an unsupported sintered polycrystalline CBN compact characterized by CBN intercrystal bonding and containing diamond particles dispersed throughout the conjoint compact. Feed for forming the novel conjoint compacts includes PBN, monocrystalline and polycrystalline CBN, and boron-rich polycrystalline CBN. |
