High-pressure sintered polycrystals from Ti-coated cBN powders: Microstructure, mechanical properties and thermo-electrical characteristics

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-03-24 DOI:10.1016/j.jeurceramsoc.2025.117393

Agnieszka Gubernat , Piotr Klimczyk , Paweł Pasierb , Paweł Rutkowski , Kamil Kornaus , Radosław Lach , Justyna Kulczyk-Malecka , Jerzy Morgiel

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引用次数: 0

Abstract

Three grades of Ti-coated cubic boron nitride (cBN) powders, varying in grain size and coating thickness, were used to create high-pressure, high-temperature (HPHT) sintered polycrystalline materials (PcBN) without addition of bonding phases. The resulting pore-free composites exhibited a Young's modulus of 620–850 GPa and Knoop hardness between 22 and 29 GPa. The composites consist of cBN grains uniformly surrounded by titanium compounds, mainly TiN and TiB₂, initially formed during the coating process and then crystalized during HPHT sintering, due to due to the high reactivity of titanium with cBN. Impedance spectroscopy and laser flash analysis indicated that microstructure of composites significantly influences their electrical and thermal conductivities, with notable temperature-dependent changes. These composites can be considered promising for advanced cutting tools, particularly in developing smart tools that can self-diagnose wear based on electrical property changes during cutting.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.