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Simultaneous Synthesis and Sintering of α‐Ti 1– x Al x (N) (0 ≤ x ≤ 0.08) by a Self‐Propagating High‐Temperature Combustion Method
Author(s) -
Hirota Ken,
Hayashi Hiromasa,
Yoshinaka Masaru,
Yamaguchi Osamu
Publication year - 2004
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/j.1151-2916.2004.tb06357.x
Subject(s) - self propagating high temperature synthesis , materials science , sintering , microstructure , vickers hardness test , fracture toughness , combustion , flexural strength , analytical chemistry (journal) , hexagonal crystal system , doping , solid solution , nitrogen , max phases , homogeneous , composite material , metallurgy , crystallography , ceramic , chemistry , thermodynamics , physics , optoelectronics , organic chemistry , chromatography
Simultaneous synthesis and sintering of hexagonal α‐Ti 1− x ‐Al x (N) (0 ≤ x ≤ 0.08) solid solutions, which contain a small amount of nitrogen, have been performed by a self‐propagating high‐temperature combustion method under a nitrogen pressure of 4 MPa. Dense materials (∼99% of theoretical) prepared directly from a mixture of elemental (Ti and Al) powders reveal homogeneous microstructure composed of fine grains (12–16 μm). α‐Ti 1− x Al x (N) ( x = 0.02; Ti 0.98 Al 0.02 N 0.26 ) exhibits a three‐point bending strength σ b of 390 MPa, a Vickers hardness H v of 9.24 GPa, and a fracture toughness K IC of 4.89 MPa·m 1/2 ; their mechanical properties are much improved by doping Al into α‐Ti(N), in comparison with those (σ b = 245 MPa, H v = 9.02 GPa, and K IC = 3.77 MPa·m 1/2 ) of α‐Ti(N) fabricated under the same conditions.