Interfacial structure and mechanical strength of .BETA.-sialon-Ni bonded system.

1 January 1990

journal article
Published by Iron and Steel Institute of Japan in ISIJ International

Vol. 30 (12) , 1071-1077
https://doi.org/10.2355/isijinternational.30.1071

Abstract

β-sialon-Ni bonded interface was investigated by SEM and TEM observations, using β-sialon/Ni/Mo bonded samples. Mechanical properties of the bonded samples were also evaluated. The bending strength of specimens bonded 1 373 K showed the maximum value (200 MPa). In the bonding at 1 273 and 1 373 K, no reaction phase was observed. In the high resolution lattice images of the interface for the specimen bonded at 1 373 K, a direct contact between Ni and β' phase (the main component of β-sialon) was revealed, and micro-twins and dislocations were observed in Ni side at the interface region. In the bonding at 1 473 K, Ni₅Si₂ was locally observed and void-like regions including Si_2-xAl_xN₂O particles were found to grow largely. The presence of silicide phase and large voids at the interface region possibly cause the poor mechanical strength of the specimens bonded at this temperature.

Keywords

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