Journal
CERAMICS INTERNATIONAL
Volume 35, Issue 6, Pages 2155-2159Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2008.11.021
Keywords
RBSN; Ceramic composites; Boron nitride; Silicon nitride
Categories
Funding
- Chinese Academy of Sciences
- Pujiang Plan of Shanghai [06PJ14100]
- National High Technology Research and Development Program [2007AA03Z558]
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Using Si and BN powders as raw materials, silicon nitride/hexagonal boron nitride (Si3N4/BN) ceramic composites were fabricated at a relatively low temperature of 1450 degrees C by using the reaction bonding technology. The density and the nitridation rate, as well as the dimensional changes of the specimens before and after nitridation were discussed based on weight and dimension measurements. Phase analysis by X-ray diffraction (XRD) indicated that BN could promote the nitridation process of silicon powder. Morphologies of the fracture surfaces observed by scanning electron microscopy (SEM) revealed the fracture mode for Si3N4/BN ceramic composites to be intergranular. The flexural strength and Young's modulus decreased with the increasing BN content. The reaction-bonded Si3N4/BN ceramic composites showed better machinability compared with RBSN ceramics without BN addition. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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