| abstract |
PCT No. PCT/DE92/00608 Sec. 371 Date Dec. 30, 1993 Sec. 102(e) Date Dec. 30, 1993 PCT Filed Jul. 23, 1992 PCT Pub. No. WO93/04015 PCT Pub. Date Mar. 4, 1993.For the improvement of the wear properties of tools with cutting edge of cubic boron nitride (CBN) or polycrystalline cubic boron nitride (PCBN) it is proposed to coat the CBN or PCBN body with a 0.5 to 6 mu m thick layer of one or more oxides of the metals zirconium and/or yttrium and/or magnesium and/or titanium and/or aluminum, preferably aluminum oxide. The wear-resistant coating is deposited from the gas phase at gas-phase temperatures up to 800 DEG C. Preferably for the coating the pulse-plasma CVD process is used. The so-coated tools are particularly suitable for the chip-forming precision machining of hard iron and hard steel materials. |