Hot Pressing of cBN Ceramics with Al Binder

H.S.L. Sithebe; David S. McLachlan; I.J. Sigalas; M. Herrmann

doi:10.4028/www.scientific.net/AST.45.1364

Paper Titles

Wear on SAE 52100 with Nanocoating Al₂O₃ by MOCVD Process
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Second Generation High-k Gate Insulators
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Optimization of UHV-CVD Thin Films for Gate Dielectric Applications
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Magneto-Photonic and Magnonic Crystals Based on Ferrite Films - New Types of Magnetic Functional Materials
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Hot Pressing of cBN Ceramics with Al Binder
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Preparation of Cu/GDC Cermet Anode by Sintering via Surface Modification with MgO Sol
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Microstructures and Interfaces in Melt-Growth Al₂O₃-Ln₂O₃ Based Eutectic Composites
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Tailoring the Properties of Ceramic-Based Composites Using Co-Extrusion Processing
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Ceramic Composites for Automotive Friction Devices
p.1394

HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 45Hot Pressing of cBN Ceramics with Al Binder

Hot Pressing of cBN Ceramics with Al Binder

Abstract:

Al-cBN cermets have been hot pressed at temperature between 800oC and 1100oC and pressure of 50MPa in vacuum. The effect of particle size of the starting powders as well as the effect of starting compositions and temperature was investigated. The materials could only densify up to 84-92% of theoretical density. After hot pressing at 800oC only Al and cBN could be observed by XRD, whereas higher hot pressing temperature result in the formation of AlN and AlB2 which retard the densification. The microstructure of the hot pressed material was studied using scanning electron microscopy. It was observed that oxide layers exist at the interface between Al and cBN phases. The presence of these oxide layers resulted in blocking the Al from spreading and therefore preventing full densification.