Abstract
Detailed HRTEM/HRSTEM investigations were carried out on the interface between SiAlON and cBN in order to better understand the transformation mechanisms taking place. The interfacial region was found to consist of nano-crystalline hBN grains embedded in an yttrium-containing oxynitride glass. Although dense layers of hBN were observed on the surface of cBN grains, the presence of a very thin yttrium-containing glass phase was found to exist along the boundary interface. Thus hBN layers adjacent to the cBN grains are not formed by direct solid–solid conversion but are instead caused solely by a slow solution-precipitation process. An increase in sintering temperature was found to promote the grain growth of the nanocrystalline hBN, Mrozowski micro-cracking and thickness of the interfacial region which ultimately result in the deterioration of the mechanical properties of these cBN containing composites.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
