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Densification and Phase Transformation of β‐SiAlON–Cubic Boron Nitride Composites Prepared by Spark Plasma Sintering
Author(s) -
Hotta Mikinori,
Goto Takashi
Publication year - 2009
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.1551-2916.2009.03098.x
Subject(s) - sialon , spark plasma sintering , materials science , boron nitride , sintering , composite material , phase (matter) , composite number , relative density , chemistry , organic chemistry
β‐SiAlON–cubic boron nitride (cBN) composites were prepared from β‐SiAlON and cBN powders at 1600°–1900°C under a pressure of 100 MPa by spark plasma sintering. The effects of cBN content and sintering temperature on densification and phase transformation of the β‐SiAlON–cBN composites were studied. When 10–30 vol% cBN was added to β‐SiAlON, the shrinkage rate of the compacts increased. The compacts of β‐SiAlON–BN composites originally containing 10–30 vol% cBN ceased to shrink at a temperature lower than that of β‐SiAlON and the density of the composites increased. The densification of β‐SiAlON–BN composites originally containing >40 vol% cBN was suppressed. The phase transformation of cBN to hexagonal BN in the β‐SiAlON–BN composite was inhibited to a greater degree than that in the cBN body.