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Preparation of SiAlON-cBN Composites Using Ni Nanoparticle Precipitated cBN Powders

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Abstract:

SiAlON Was Mixed with Ni Nanoparticle Precipitated cBN (SiAlON-cBN/Ni) and Sintered by Spark Plasma Sintering at 1923 K for a Holding Time (tH) of 0 to 1.8 Ks. the Effect of Ni Nanoparticle and Holding Time on the Phase Transformation of cBN to Hexagonal (hBN), Densification, Microstructure and Hardness of the SiAlON-cBN Composites Was Studied. At tH =1.8 Ks , the Relative Density of the SiAlON-20 Vol% cBN/Ni Was 99%, 7% Higher than that of SiAlON-20 Vol% cBN, Indicating that Ni Nanoparticle on cBN Promoted the Densification of SiAlON-cBN Composites. The BN Grains in SiAlON-20 Vol% cNB Showed a Round Morphology, whereas the BN Grains in SiAlON-20 Vol% cBN/Ni Composite Showed a Flake Morphology Characteristic of hBN. The Phase Transformation of cBN Was Accelerated by Ni. the Maximum Hardness of SiAlON-20 Vol% cBN/Ni Was 16.3 GPa Obtained at tH = 0 Ks.

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Periodical:

Key Engineering Materials (Volume 508)

Pages:

17-20

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.508.17

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Online since:

March 2012

Authors:

Jian Feng Zhang, Rong Tu, Takashi Goto

Keywords:

CBN, Holding Time, Ni Nanoparticles, SiAlON, Spark Plasma Sintering (SPS)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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