Abstract
Microhardness, phase combination and microstructure of the c(cubic)BN–TiN–Al composite sintered under static pressure of 5.8 GPa and at temperatures of 1200 and 1400 °C for 30 min were investigated. Microhardness increased with increasing cBN content of the specimens sintered at both temperatures, and the highest microhardness of 30.7 GPa was achieved for the 75 vol.% cBN–13 vol.% TiN–12 vol.% Al composition specimen sintered at both 1200 and 1400 °C. Most of the samples sintered at 1200 °C had higher microhardness than the same composition specimen sintered at 1400 °C. During high-pressure sintering, reactions occurred between cBN, TiN and Al, then new compounds, TiB 2 and AlN, were formed. TEM analysis indicated that all cBN and TiN grains were surrounded with an AlN layer of different thickness, and small TiB 2 and AlN grains were co-existed to form clusters.
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