发明授权
- 专利标题: Electrode for piezoelectric composites
- 专利标题(中): 压电复合材料用电极
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申请号: US213794申请日: 1988-06-30
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公开(公告)号: US4900972A公开(公告)日: 1990-02-13
- 发明人: Wolfram Wersing , Manfred Schnoeller , Karl Lubitz , Jutta Mohaupt
- 申请人: Wolfram Wersing , Manfred Schnoeller , Karl Lubitz , Jutta Mohaupt
- 申请人地址: DEX Berlin and Munich
- 专利权人: Siemens Aktiengesellschaft
- 当前专利权人: Siemens Aktiengesellschaft
- 当前专利权人地址: DEX Berlin and Munich
- 优先权: DEX3724290 19870722
- 主分类号: H04R17/00
- IPC分类号: H04R17/00 ; H01L41/09 ; H01L41/29 ; H03H9/13
摘要:
The invention provides an electrode for piezoelectric composites having high acoustic attenuation. The electrode is composed of a first layer having high elasticity and lower conductivity and of a second layer lying thereabove that has higher conductivity. The invention also provides a method for the manufacture thereof. The first layer is an intrinsically conductive plastic directly deposited on the ceramic whose polymerization is initiated by chemical or anodic oxidation of the corresponding monomers. The second layer is fashioned of adequately conductive metal and is preferably first sputtered on or vapor-deposited in a thinner layer and is then subsequently electrolytically reinforced. Piezoelectric composites that exhibit high acoustic attenation and, thus, prevent an acoustic crosstalk between the individual transducer elements can be manufactured from piezoelectric ceramic lamina or foils provided with such electrodes. Such composites also withstand higher mechanical distortion (for example, due to thermal expansion), even if the ceramic is highly porous.
公开/授权文献
- US5517968A Automobile engine control system 公开/授权日:1996-05-21
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