A PZT (PbZr0.58Ti0.42O3) plate was bonded to MoSi2-20wt%Mo2B5 ceramics with an adhesive. Electrical properties of the layered composite and voltage generated in the PZT by mechanical impacts were measured. The electromechanical coupling coefficient κp, dielectric constant εr and mechanical factor Qm in the composite were lower values than those in the PZT, but the piezoelectricity of the PZT was found to be left in the composite. When cracks were introduced on the MoSi2-Mo2B5 surface of the composite with the Vickers hardness tester, the voltage vibration above 250mV appeared. These results suggest a possibility for producing ceramic materials with a self-detecting function of crack generation and fracture.
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Akiyama et al. (1994) studied this question.