Bilayered coatings of BN/diamond grown on Si3N4 ceramic substrates


Cubic boron nitride (c-BN) is a well known material to be used in machining of ferrous metallic alloys, namely as a coating. However, in most practical cases, there is a lack of adhesion to the substrate material. In this work, BN coatings were deposited by magnetron sputtering on silicon nitride (Si3N4) ceramic substrates using an intermediate layer of CVD microcrystalline (MCD) or nanocrystalline diamond (NCD). The goal was to improve the c-BN content by using diamond interlayers, and to optimize film adhesion to the substrate by employing such ceramic, which is known to provide very high adhesion strength to CVD diamond. The BN/NCD/Si3N4 combination demonstrated to be unique regarding the absence of delamination at both the BN/diamond and diamond/substrate interfaces, also providing the highest c-BN phase content. (C) 2011 Elsevier B.V. All rights reserved.




Materials Science


Ferreira, S; Duarte, P; Almeida, FA; Silva, RF

nossos autores


F.A. Almeida acknowledges FCT grant SFRH/BPD/34869/2007. The financial funding from the FCT Project MULTIDIACOAT PTDC/EME-TME/100689/2008 is also gratefully acknowledged.

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