| 主权项 |
1. A cubic boron nitride compact consisting of:
(a) a polycrystalline mass of cubic boron nitride particles, present in an amount of at least 70 percent by volume; (b) a binder phase, wherein the binder phase consists of an alloy consisting of at least 40 percent by weight of one or more of a first element selected from the group consisting of nickel, iron and cobalt and the balance of the alloy consisting of two or more of a second element selected from the group consisting of chromium, molybdenum, tungsten, lanthanum, cerium, yttrium, niobium, tantalum, zirconium, vanadium, hafnium, aluminium and titanium, the cumulative weight percentage of the two or more of a second element being 5 to 60 percent by weight; and (c) an oxide, wherein the oxide is: (i) present in an amount of less than 5 percent by mass of a combination of binder and oxide; (ii) selected from rare earth oxides, yttrium oxide, an oxide of a Group 4B, 5B, and 6B metal, silicon oxide, and silicon-aluminium-nitride-oxide, and (iii) dispersed through the binder. |
