Effect of carbon black on properties of 0–3 piezoelectric ceramic/cement composites

Abstract

0–3 cement-based piezoelectric composites were fabricated using sulphoaluminate cement and piezoelectric ceramic [0.08Pb(Li 1/4Nb 3/4)O 3 · 0.47PbTiO 3 · 0.45PbZrO 3] [P(LN)ZT] as raw materials by compressing technique. The influences of carbon black content on the piezoelectric and dielectric properties, electric conductivity and impedance were investigated. The results indicate that the piezoelectric strain constant d 33 and piezoelectric voltage constant g 33 of the composites increase gradually with a suitable carbon black addition. When the carbon black content is 0.3 wt%, both of the piezoelectric strain constant d 33 and piezoelectric voltage constant g 33 of the composite exist the maximum value, which are 17.45 pC N −1 and 36.3 mV m N −1, respectively. As the carbon black content increases, the dielectric constant ε r, dielectric loss tanδ and electric conductivity σ of the composites all increase, while the impedance decreases. In the frequency range tested, the more the carbon black content, the higher the ε r value. The planar electromechanical coupling coefficient K p, the thickness electromechanical coupling coefficient K t and the mechanical quality factor Q m are almost unaffected by the carbon black content.