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Phase Formation and Densification Peculiarities of Hf–C–N Solid Solution Ceramics during Reactive Spark Plasma Sintering
Author(s) -
Zavjalov Alexey P.,
Nikiforov Pavel A.,
Kosyanov Denis Y.,
Zakharenko Alexander M.,
Trukhin Viacheslav O.,
Talskikh Kristina Y.,
Shichalin Oleg O.,
Papynov Evgeniy K.
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000482
Subject(s) - spark plasma sintering , materials science , sintering , ceramic , relative density , grain size , indentation hardness , microstructure , diffraction , phase (matter) , analytical chemistry (journal) , metallurgy , hafnium , solid solution , atmospheric temperature range , chemical engineering , zirconium , chromatography , thermodynamics , physics , chemistry , organic chemistry , optics , engineering
Herein, phase formation and sintering of hafnium carbonitride ceramics from a 4HfC–3HfN powder mixture using reactive spark plasma sintering are studied. X‐ray diffraction (XRD) data show that the mutual heterodiffusion of carbon C and nitrogen N increases with sintering temperature within the studied temperature range 1500–2100 °C. 4HfC–3HfN powder sintering at 1900 °C for 5 min under 60 MPa pressure yields HfC x N 1− x solid solution ceramics. The ceramic sample prepared under optimal conditions (2100 °C, 5 min, 60 MPa) is characterized by an average grain size of 10 μm, microhardness of 19.6–22.5 GPa, and relative density above ≈97%.