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Reactive hot pressing of TiC 0.5 ceramic at low applied pressure with 1 wt% Ni additive
Author(s) -
Kannan Rajaguru,
Rangaraj Lingappa,
Jayaram Vikram
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17942
Subject(s) - materials science , stoichiometry , hot pressing , ceramic , relative density , flexural strength , nickel , phase (matter) , metal , analytical chemistry (journal) , metallurgy , composite material , sintering , chemistry , chromatography , organic chemistry
Densification in non‐stoichiometric TiC 0.5 ceramic has been studied by reactive hot pressing (RHP) of Ti:0.5C composition at 4–40 MPa, 1200°C for 60 min. Incomplete reaction and 94% relative density (RD) at a pressure of 4 MPa changed to 99% RD and a negligible amount of residual Ti at 40 MPa. In contrast, the addition of 1 wt% Ni in the starting Ti‐0.5C powder mixture resulted in full density at a lower pressure of 4 MPa, leading to comparable hardness. It is argued that both, reaction as well as densification, were improved by the formation of transient Ti‐Ni liquid phase. The enhanced RD and residual metallic phase in the nickel‐containing non‐stoichiometric TiC 0.5 showed high flexural strength (537 ± 79 MPa), which is comparable to values obtained from materials processed at high temperature and pressure.