Structure formation of TiB2-TiC-B4C-C hetero-modulus ceramics via reaction hot pressing

O. Popov, S. Chornobuk, Vladimir Vishnyakov

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Abstract

The densification kinetics and structure of TiB2-TiC-C, TiB2-C and TiB2-B4C-C hetero-modulus ceramics produced via reaction hot-pressing of B4C and TiС precursors are investigated. The reaction begins at 1100°C with boron carbide decomposition and progresses in two main stages which can be predominantly determined by the boron atoms to TiC grains diffusion mechanisms. The solid phase grain boundary diffusion starts at 1100°C and effective gas phase transport finalises the reaction at temperatures above 1400°C. Two distinctive waves of the charge consolidation allow densifying investigated refractory materials at 1900°C and 30MPa during 16 minutes. The reaction is shown to define the features of the composite structure: submicron TiB2 particles and faceted voids in B4C matrix, flake-like graphite and TiB2 inclusions in TiC matrix. High concentration of carbon atoms (~ 10 at.%) in synthesized diboride titanium grains have been observed.
Original languageEnglish
Pages (from-to)106-112
Number of pages7
JournalInternational Journal of Refractory Metals and Hard Materials
Volume64
Early online date2 Feb 2017
DOIs
Publication statusPublished - Apr 2017

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