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Mechanochemical Synthesis and Pressureless Sintering of TiB 2 –AlN Composites
Author(s) -
Kim HyungJong,
Choi HeonJin,
Lee JuneGunn
Publication year - 2002
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.1151-2916.2002.tb00216.x
Subject(s) - materials science , crystallite , sintering , flexural strength , composite material , fracture toughness , pressureless sintering , transmission electron microscopy , relative density , electrical resistivity and conductivity , scanning electron microscope , metallurgy , nanotechnology , engineering , electrical engineering
TiB 2 ‐AlN composites have been fabricated by the pressureless sintering of a mechanochemically processed Ti, Al, and BN powder mixture. TiB 2 ‐AlN powder was obtained from the mixture of Ti, Al, and BN, which had a composition corresponding to 45.7 wt% TiB 2 ‐54.3 wt% AlN, after mechanochemical processing for longer than 24 h. X‐ray diffraction and transmission electron microscopy analysis showed that the powder subjected to mechanochemical processing for 60 h consisted of crystallites less than 300 nm in size with a disordered crystal structure. TiB 2 ‐AlN composites with 95% relative density, a flexural strength of 172 MPa, a fracture toughness of 4.6 MPa·m 1/2 , a hardness of 12.0 GPa, and an electrical resistivity of 1488 μΩ·cm were obtained by pressureless sintering at 1700°C for 2 h of the powder subjected to mechanochemical processing for 60 h.