Fabrication and post heat treatment of 0.5Pb (Mg 1/3 Nb 2/3) O 3 -0.5Pb(Zr 0.48 Ti 0.52 )O 3 coatings by supersonic plasma spray

Potassium sodium niobate (KNN)‐based lead‐free piezoelectric ceramic coatings on steel structure by thermal spray method

“…In addition to the applications in forming protective coatings, thermal spray process has been applied for the fabrication of some electronic components and sensor devices made of ceramics, including strain gauge, and humidity sensors . Research efforts have also been made for deposition of PZT‐based piezoelectric coatings by thermal spray . However, because of the severe thermal decomposition of the PZT‐based materials, the coatings lost the chemical stoichiometry and exhibited substantial amount of secondary phases .…”

“…14 Research efforts have also been made for deposition of PZT-based piezoelectric coatings by thermal spray. [15][16][17][18] However, because of the severe thermal decomposition of the PZT-based materials, the coatings lost the chemical stoichiometry and exhibited substantial amount of secondary phases. 15,16 In addition, physical defects such as high porosity, cracks, and delamination were observed in the thermal-sprayed PZT coatings.…”

Structural evolution of thermal sprayed bismuth sodium titanate piezoelectric ceramic coatings

“…As important smart materials, piezoelectric ceramic coatings have shown great application potentials in structure health monitoring, energy harvesting, etc. Research efforts have been reported on fabricating piezoelectric ceramic coatings by thermal spray process . By far, most of the thermal sprayed piezoelectric ceramic coatings had Pb‐based compositions, due to the outstanding electromechanical coupling properties of lead zirconate titanate (PZT) bulk ceramic.…”

“…By far, most of the thermal sprayed piezoelectric ceramic coatings had Pb‐based compositions, due to the outstanding electromechanical coupling properties of lead zirconate titanate (PZT) bulk ceramic. However, PZT piezoelectric ceramic coatings fabricated by thermal spray process usually had secondary phases, such as ZrO 2 , PbO, PbTiO 3 , and pyrochlore phase, and thus showed poor piezoelectric properties far inferior to the bulk counterparts. The mechanism of phase formation in thermal spray approach involves the melting‐recrystallization process, which is different from solid‐state reaction in ceramic synthesis approach.…”

“…The mechanism of phase formation in thermal spray approach involves the melting‐recrystallization process, which is different from solid‐state reaction in ceramic synthesis approach. Despite the efforts made on removing secondary phases, no single perovskite phase PZT coatings from thermal spray process were reported in the literature.…”