TWO-LAYER PCBN COMPOSITES FOR USE IN A TOOL

  • M. P. Bezhenar V. N. Bakul Institute for superhard materials of NAS of Ukraine
  • Ya. M. Romanenko V. N. Bakul Institute for superhard materials of NAS of Ukraine
  • T. A. Garbuz V. N. Bakul Institute for superhard materials of NAS of Ukraine
  • S. M. Konoval V. N. Bakul Institute for superhard materials of NAS of Ukraine
Keywords: cubic boron nitride, superhard composite, two-layered plates, hardness, tool, cutting properties

Abstract

In this paper present the results of studying the structure and properties of PCBN composites produced by reactive sintering under high pressure and temperature powders of cBN with Al, Ti, Co and Ni on a VK15 hard alloy substrate. The structure and properties of model two-layer composites on TiC, TiN, and TiB2 substrates were studied separately. High-pressure apparatuses «anvil with recess» were used. The obtained samples after mechanical treatment with a free and bound abrasive had a cylindrical shape with a diameter of up to 15 mm and a height of up to 5 mm. The phase composition was determined by X-ray diffraction analysis. The hardness was determined using the Knoop pyramid, the load on the indenter is 10 N, the electric resistivity is measured using a digital ohmmeter. The cutters working capacity of two-layered superhard composites was investigated on an automated stand based on a turning machine 1К62 at the final turning of CVH steel HRC 58-60

Published
2018-07-29
Issue
Vol 21 (2018): Rock Destruction and Metal-Working Tools – Techniques and Technology of the Tool Production and Applications
Section
Instrumental, structural and functional materials based on diamond and cubic bor