cBN BASED MATERIALS WITH TiN-Al BINDER PHASE: SINTERING, STRUCTURE, PROPERTIES.

K. V. Slipchenko; V.Z. Turkevich; V. M.  Bushlya; J.-E. Ståhl

K. V. Slipchenko V.N. Bakul Institute for Superhard Materials of NAS of Ukraine
V.Z. Turkevich V.N. Bakul Institute for Superhard Materials of NAS of Ukraine
V. M. Bushlya Lund University
J.-E. Ståhl Lund University

Keywords: high pressure apparatus, superhard ceramics, cBN, phase composition, structure

Abstract

Cubic boron nitride material was produced via high pressure and high temperature sintering with titanium nitride and aluminum as binder phase. Microstructure, phase composition and physical-mechanical properties were subject of current research. Formation of TiB₂ and AlN was established in samples sintered at temperatures above 1750 °C. The highest values of microhardness were found in samples sintered at the temperature range of 1850 – 2000 °C. Fracture toughness of samples practically does not change during thermobaric sintering.