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Fabrication of Al‐Added TiN Materials by the Combination of Double Self‐Propagating High‐Temperature Synthesis and Pulsed Electric‐Current Pressure Sintering
Author(s) -
Nakane Shingo,
Hikawa Sho,
Endo Takaya,
Kato Masaki,
Hirota Ken,
Miyauchi Hiroya,
Hioki Tadashi
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02130.x
Subject(s) - materials science , sintering , vickers hardness test , tin , self propagating high temperature synthesis , fabrication , grain size , fracture toughness , metallurgy , microstructure , composite material , medicine , alternative medicine , pathology
Crystalline phases of Al‐added TiN, denoted as (Ti 1− x Al x )N y (0≤ x ≤0.10, 0.8< y <1.0), prepared from a mixture of Ti and Al powders by self‐propagating high‐temperature synthesis (SHS) in a nitrogen atmosphere, have been investigated. By repeating SHS twice, in the region of 0.0< x ≤0.02 cubic (Ti 1− x Al x )N y solid solutions, and in the region of 0.02< x ≤0.10 composites consisting of (Ti 1− x Al x )N y and hexagonal Ti 2 AlN were formed. After powder characterization, they were consolidated to dense materials (>97% of theoretical) by pulsed electric‐current pressure sintering. With increasing Al addition, the optimum sintering temperatures were lowered, followed by reduction of grain size. Their mechanical properties, that is, three‐point bending strength σ b , Vickers hardness H v , and fracture toughness K I C were evaluated as a function of Al content.