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Synthesis of Dense TiB 2 ‐TiN Nanocrystalline Composites through Mechanical and Field Activation
Author(s) -
Lee Jae Won,
Munir Zuhair A.,
Shibuya Masachika,
Ohyanagi Manshi
Publication year - 2001
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.1151-2916.2001.tb00818.x
Subject(s) - materials science , crystallite , nanocrystalline material , tin , fracture toughness , boride , composite material , ball mill , nitride , spark plasma sintering , vickers hardness test , indentation hardness , titanium diboride , microstructure , metallurgy , ceramic , nanotechnology , layer (electronics)
The synthesis of dense nanometric composites of TiN‐TiB 2 by mechanical and field activation was investigated. Powder mixtures of Ti, BN, and B were mechanically activated through ball milling. Some powders were milled to reduce crystallite size but to avoid initiating a reaction. In other cases powders were milled and allowed to partially react. All these were subsequently reacted in a spark plasma synthesis (SPS) apparatus. The products were composites with equimolar nitride and boride components with relative densities ranging from 90.1% to 97.2%. Crystallite size analyses using the XRD treatments of Williamson‐Hall and Halder‐Wagner gave crystallite sizes for the TiN and TiB 2 components in the range 38.5–62.5 and 31.2–58.8 nm, respectively. Vickers microhardness measurements (at 2 N force) on the dense samples gave values ranging from 14.8 to 21.8 GPa and fracture toughness determinations (at 20 N) resulted in values ranging from 3.32 to 6.50 MPa·m 1/2 .