Obtaining at High Pressure the TiN-TiB<sub>2</sub> Ceramic Nano-Composite

Abstract

The process of consolidation of TiN nanopowders under a hydrostatic pressure of 3 GPa was evaluated from the evolution of substructure parameters of compacts obtained after different exposure of powder bodies under constant pressure at room temperature. It has been established that in compaction, changes in the substructure reflect deformation processes of the porous body, which are accompanied by relaxation processes and the corresponding decrease in microstresses. The sintering of consolidated 80 wt% TiN -20 wt% TiB 2 powders at 3 GPa in the temperature range 1300˚C -1600˚C leads to the substitution of N atoms by B atoms in TiN and possibly to the substitution of B atoms by N atoms in TiB 2 . The presence of oxygen in powders promotes the formation of titanium oxynitride, which increases the microhardness of specimens.

Untitled

“…% TiN -20 wt. % TiB 2 is obtained from a homogenized mixture of powders by hot pressing at 4GPa at a temperature of 1400 °C for 3min [16]. The specimen obtained have a cylindrical form with diameter d=5mm and height l=10mm.…”