International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

This study investigates the mechanisms of liquid-phase assisted sintering in high-entropy ceramics (HECs) using a nickel binder. The research focuses on the densification process of (Ti, Zr, Hf, Nb, Ta)C-based cermets with 10 vol% Ni, and how pressure influence liquid-phase extraction. Results show that eutectic reactions between Ni and carbide phases was observed during liquid formation below 1400°C. Microstructural analysis reveals a nickel-rich matrix, solid solutions, and NbC-based carbide inclusions in the extracted drop. These findings provide insights into optimizing processing parameters for advanced HEC-based composites.

The contact interaction between the metal matrix composite based on Ti64 and the B4C-based composite was investigated. It is shown that the interaction process is influenced by the annealing temperature and holding time. The phase that formed independently of the contact pair is TiB. However, the thickness of the products formed at the boundary depends on the contact pair. In case of the Ti64-B4C pair the thickness is 70 μm, while for (Ti64-40 wt% TiC)-B4C it becomes 10 μm. This significant difference in the thickness is due to the presence of refractory particles (TiC) in (Ti64-40 wt% TiC)-B4C couple, because the TiC phse reduce the diffusion of Ti into the contact zone.

Titanium–titanium boride (Ti/TiC) metal matrix composites have been widely identified as promising materials for various applications. The traditional ingot metallurgy processing strategies used to fabricate these materials are energy intensive and have fallen short of their perceived mass production potentials. Powder metallurgy processing of Ti/TiC composites from titanium and TiC powder blends, is currently widely used for the cost-efficient production of such composites. Additional processing by the method of hot pressing improves the structure and mechanical properties of this class of materials. The composites have the heterogenous microstructure with areas high hardness area over 1173 HV. While matrix and inclusions had the value of 700 HV.