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    • 4. 发明公开
    • PIEZOELEKTRISCHES BAUTEIL MIT SICHERHEITSSCHICHT UND INFILTRATIONSBARRIERE UND VERFAHREN ZU DESSEN HERSTELLUNG
    • EP2140508A1
    • 2010-01-06
    • EP08718215.0
    • 2008-03-26
    • Siemens Aktiengesellschaft
    • DENZLER, MichaelHAMANN, ChristophKASTL, Harald JohannesKOHN, StefanKRONBERGER, MaximilianREICHINGER, ChristianSCHUH, CarstenZUMSTRULL, Claus
    • H01L41/083H01L41/24
    • H01L41/273H01L41/0838Y10T29/42
    • The invention relates to a piezoelectric component comprising a monolithic stack, having electrode layers and piezoceramic layers arranged alternately one on top of the other, the piezoceramic layers comprising a piezoceramic, and having at least one porous security layer arranged in the stack for the formation of a crack if mechanical overload of the stack should occur. The piezoelectric component is characterized in that an infiltration barrier is arranged between the security layer and a lateral surface section of the stack for suppressing the penetration of a foreign substance into the security layer. In addition, a method for producing the stack of the piezoelectric component is provided, comprising the following process steps: a) arranging ceramic green foils and metal layers alternately one upon the other to form a green foil laminate, wherein at least one starting layer of the security layer is integrated in the green foil laminate and b) thermal treatment of the green foil laminate to form the monolithic stack, wherein the piezoceramic layer is produced by the ceramic green foils, the electrode layers are produced by the metal layers and the security layer is produced by the starting layer of the security layer and the infiltration barrier is formed. The piezoelectric component is used as a piezoactuator for controlling a valve, particularly a valve of an internal combustion engine.
    • 压电元件本发明涉及一种压电元件,该压电元件包括​​单片叠层,该叠层具有交替布置的电极层和压电陶瓷层,压电陶瓷层包括压电陶瓷,并且具有至少一个布置在叠层中的多孔安全层,用于形成 如果堆叠机械过载应该发生裂缝。 压电部件的特征在于,在安全层和堆叠的侧表面部分之间布置有渗透阻挡层,用于抑制异物进入安全层的渗透。 此外,提供了一种用于制造压电部件的叠层的方法,该方法包括以下工艺步骤:a)将陶瓷生箔和金属层交替地一个布置在另一个上以形成生坯箔层压体,其中至少一个起始层 将安全层集成在未烧结的箔层压板中并且b)对未烧结的箔层压板进行热处理以形成整体堆叠体,其中压电陶瓷层由陶瓷未烧结箔制成,电极层由金属层制成并且安全 层由安全层的起始层产生并形成渗透屏障。 压电部件被用作用于控制阀的压电致动器,特别是内燃机的阀。