Paper Title:
Spark Plasma Sintering of βSiAlON-cBN Composite
  Abstract

βSiAlON-cubic boron nitride (cBN) composites were prepared from β-SiAlON and cBN powders using spark plasma sintering (SPS) at firing temperature of 1600-1900oC under pressure of 100MPa, and densification, phase transformation and hardness of the composites were investigated. The phase transformation of cBN to hexagonal BN (hBN) was inhibited in βSiAlON-cBN composite. βSiAlON-cBN composites containing 10-30 vol% cBN fired at 1650oC were densified to 95-98% of theoretical density with no transformation of cBN to hBN. Vickers hardness of the βSiAlON-cBN composite containing 20 vol% cBN fired at 1650oC was 17.5 GPa in maximum value, and the hardness significantly decreased as cBN phase was transformed to hBN in the composites.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
599-602
DOI
10.4028/www.scientific.net/MSF.561-565.599
Citation
M. Hotta, T. Goto, "Spark Plasma Sintering of βSiAlON-cBN Composite", Materials Science Forum, Vols. 561-565, pp. 599-602, 2007
Online since
October 2007
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Price
$32.00
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