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Low Cost Si3N4/SiC Nanocomposites, Processing, RT and HT Properties

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Abstract:

Silicon nitride - silicon carbide nanocomposite has been prepared by an in-situ method that utilizes formation of SiC nanograins by C+ SiO2 carbothermal reduction during the sintering process. The developed C/SiO2 derived nanocomposite consists of a silicon nitride matrix with an average Si3N4 matrix grain diameter of approximately 200 nm with inter- and intra- granular SiC inclusions with sizes of approximately 150 nm and 40 nm, respectively. The mean value of room temperature 4-point bending strength is 670 MPa with the Weibull modulus of 7.5 and indentation fracture toughness of 7.4 MPa.m1/2. The creep behaviour was investigated in bending at temperatures from 1200°C to 1450°C, under stresses ranking from 50 to 150 MPa in air. A significantly enhanced creep resistance was achieved by the incorporation of SiC nanoparticles into the matrix. The inserts machined from this composite have three times longer life time compared to those available on the market.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

185-190

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.185

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Online since:

August 2006

Authors:

Pavol Šajgalík, Miroslav Hnatko, Zoltán Lenčéš, Ján Dusza, Monika Kašiarová, J. Kovalčík, Vladimír Šída

Keywords:

Bend Strength, Creep, Cutting Inserts Life Time, Nanocomposite, Silicon Carbide (SiC)

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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