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HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Spark Plasma Sintering of βSiAlON-cBN Composite

Spark Plasma Sintering of βSiAlON-cBN Composite

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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.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

599-602

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.599

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Cite this paper

Online since:

October 2007

Authors:

Mikinori Hotta, Takashi Goto

Keywords:

Cubic Boron Nitride (CBN), Densification, Hardness, Phase Transformation, Spark Plasma Sintering (SPS), ß-SiAlON

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