WU Nanxing, CHEN Zhenglin, LIAO Dahai

(School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract: Silicon nitride ceramics with its high strength, wear resistance, chemical stability and other advantages can be applied to stationary blades in turbines and metal-based silicon nitride ceramic friction materials. The key to its application is to avoid the defects formed during the preparation. With a long propagation distance and a high susceptibility to interference on a propagation path, Lamb wave can identify the defects in silicon nitride ceramic stationary blades and metal-based silicon nitride ceramic friction materials. In this paper, the lamb wave dispersion curves for silicon nitride ceramic turbine blades and metal-based silicon nitride ceramic friction materials are plotted based on the theory of bisection, and the choices of lamb wave modes and frequency thickness products for their flaws detecting are given. The most preferable should be the wave with high energy, good waveform and less proneness to mode conversion. It’s expected to provide theoretical basis for the practice of detecting defects in silicon nitride ceramic turbine blades and metal-based silicon nitride ceramic materials.

Key words: Lamb wave ; silicon nitride ceramics; turbine blades; friction materials; dispersion curve