Glass-filled piezoelectric ceramic and its manufacturing method

Abstract

Abstract PURPOSE:To enhance the stability of piezoelectric ceramic by mixing specific amount of glass with piezoelectric ceramic after baking, press forming the mixture, heating the mixture at a high temperature equal to or higher than the melting point of the glass, providing electrodes, applying high DC voltage to the electrodes to perform polarization, thereby narrowing the band width. CONSTITUTION:Solid solution of PbZrO3 and PbTiO3 at a ratio of approx. 55:45 is temporarily baked at approx. 800 deg.C, the solution is then pulverized and molded, the molded solution is primarily baked at approx. 1,000-1,300 deg.C to produce piezoelectric ceramic. On the other hand, silicate glass is pulverized, is mixed at the ratio of 1-20wt% with the ceramic, the mixture is then press formed to produce a block of glass-containing piezoelectric ceramic. Thereafter, this block is baked at a temperature equal to or higher than the melting point of the glass such as approx. 500 deg.C, both front and back surfaces are polished, and baking electrodes made of silver paste are formed on the both sides. The block is then immersed in oil which is heated to approx. 200 deg.C, a DC voltage of approx. 5,000V is applied to the block, the block is then cooled to room temperature, and the voltage is then removed to finish the polarization.

Inventors

• 👤 Kunio Sasaki
• 👤 邦夫 佐々木

Bibliographic Details