Piezoelectric component comprising a security layer and an infiltration barrier and a method for the production thereof

A method for producing a stack of the piezoelectric component, comprising the following process steps:

• alternate arrangement one above the other of ceramic green foils and metallic layers to form a green foil composite, wherein at least one precursor layer of a security layer is integrated into the green foil composite, and
• heat treatment of the green foil layer to form a monolithic stack, wherein the piezoceramic layers are created from the ceramic green foils, the electrode layers are created from the metallic layers, the security layer is created from the precursor layer of the security layer, and wherein an infiltration barrier is formed.

An injection valve for an internal combustion engine comprising a piezoelectric monolithic stack comprising:

• alternately arranged electrode layers and piezoceramic layers to form said monolithic stack,
• at least one porous security layer arranged in the stack for the purpose of forming a crack if there is mechanical overload of the stack, and
• an infiltration barrier arranged between the security layer and a lateral surface layer of the stack for suppressing penetration of a foreign substance into the security layer.