Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 89, Issue 7, Pages 2147-2153Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1551-2916.2006.01002.x
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Dense machinable alpha-SiAlON/BN composites were fabricated by hot-pressing using turbostratic boron nitride (tBN) obtained from nitridation of melamine diborate. The tBN was added to the starting powders, or introduced as a coating that formed in situ on alpha-Si3N4 carrier powders during nitridation, and was subsequently converted to hexagonal boron nitride (hBN) during hot pressing by solution reprecipitation. These composites maintain high strength at 1000 degrees C and their strength/hardness are much higher than similar composites prepared using commercial hBN powder, which yielded a coarser microstructure. Good machinability was achieved despite a flat R curve.
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