Invention Grant
- Patent Title: Piezoelectric ceramic, method for making the same, piezoelectric element, liquid discharge head, ultrasonic motor, and dust cleaner
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Application No.: US15396223Application Date: 2016-12-30
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Publication No.: US10280119B2Publication Date: 2019-05-07
- Inventor: Takanori Matsuda , Hiroshi Saito , Tatsuo Furuta , Jumpei Hayashi , Takayuki Watanabe , Toshihiro Ifuku
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Canon U.S.A., Inc. IP Division
- Priority: JP2010-264223 20101126
- Main IPC: H01L41/43
- IPC: H01L41/43 ; H01L41/09 ; B41J2/16 ; H02N2/10 ; B41J2/14 ; H02N2/16 ; H03H9/17 ; C04B35/468 ; C04B35/626 ; H01L41/187 ; C04B35/46 ; B08B7/02

Abstract:
A barium titanate piezoelectric ceramic having good piezoelectric properties and mechanical strength and a piezoelectric element that includes the ceramic are provided. A method for making a piezoelectric ceramic includes forming a compact composed of an oxide powder containing barium titanate particles, sintering the compact, and decreasing the temperature of the compact after the sintering. The sintering includes (A) increasing the temperature of the compact to a first temperature within a temperature range of a shrinking process of the compact; (B) increasing the temperature of the compact to a second temperature within a temperature range of a liquid phase sintering process of the compact after (A); (C) decreasing the temperature of the compact to a third temperature within the temperature range of the shrinking process of the compact after (B); and (D) retaining the third temperature after (C).
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