Abstract
Abstract A dense, crack free and well bonded ZrB 2 -SiC-WC top coating with silicon carbide diffusion bond coat was successfully prepared on graphite substrate by spark plasma sintering (SPS) at 1900 °C under 20 MPa pressure for 5 min. The thickness of top coat and diffusion bond coat was about 800 µm and 3 mm, respectively. The bonding strength was evaluated by bending test. In the bending specimens the fracture occurred not at the interface, but at the graphite substrate which indicates that the bonding strength of coating and substrate is higher than strength of graphite substrate. Phase continuity of silicon carbide from top coat to interface and diffusion zone led to high adhesion of coating to graphite.
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