3D printing of CaBi₄Ti3.925(Nb2/3Mn1/3)0.075O₁₅ ceramics for high temperature ultrasound transducer

Bismuth layer-structured CaBi 4 Ti 3.925 (Nb 2/3 Mn 1/3 ) 0.075 O 15 (CBTNM) piezoelectric ceramics have been prepared using stereolithography (SL) technology. The effects of various solid contents (76–82 wt%) of CBTNM ceramics on the slurry viscosity, phase structure, microstructure, and electric performance were studied in detail. At a solid content of 82 wt%, the ceramic exhibits good piezoelectric properties. The piezoelectric constant d 33 , thickness-mode electromechanical coupling coefficient k t , and Curie temperature Tc were 21 p C/N, 47%, and 790 °C, respectively. The piezoelectric constant of the ceramic has a good stability up to 500 °C. Furthermore, a high-temperature ultrasound transducer was designed and fabricated based on the CBTNM ceramic, and its pulse-echo performance was characterized from room temperature to 250 °C. The pulse-echo performance indicates that the −6 dB bandwidth and echo amplitude of the transducer decrease slightly, but still work normally up to 250 °C. These results indicate that the transducer fabricated based on CBTNM ceramics has potential in high-temperature testing applications.