Abstract: A piezoelectric component with a monolithic stack has piezoceramic layers and electrode layers arranged alternately one on top of the other, at least one porous security layer arranged in the stack for the formation of a crack if mechanical overload of the stack occurs, at least one outer electrode arranged at a lateral surface section for electric contacting of the electrode layers and a plastic sheath of the stack for protecting the stack, wherein the plastic sheath has silicon. The piezoelectric component is characterized in that a coating of the outer electrode, has silicon-free polymer, is arranged between the outer electrode and the plastic sheath. By coating the plating of the outer electrode, the area of the security layer present directly under the plating is protected from silicon component deposits. The piezoelectric component is used for the control of valves, particularly of injection valves of internal combustion engines.

Abstract: A method for producing a correlation between a first state of a piezoelectric component (1, 20) comprising a piezoceramic element and a second state of the component comprises the following steps: a) a first group of components respectively in the first state is prepared (101), b) at least one defined characteristic of each component of the first group is determined (102), c) the piezoceramic element of the components of the first group is polarised, and a corresponding component of a second group in the second state is thus created from each component of the first group (103), d) at least one defined characteristic of each component of the second group is determined (104), and e) the correlation is produced by comparing the defined characteristics of each component of the first group with the defined characteristic of the corresponding component of the second group (105).

Abstract: In a piezoelectric multilayer actuator (1) having micromechanical relief zones (30) and an insulation layer (40) as well as in a method for producing said actuator, as a result of the micromechanical relief zones (30), poling cracks are concentrated in these relief regions (30). This makes it possible to provide the sections I, II, III of the multilayer actuator (1) with an insulation layer (40) which only has an extension behaviour similar to the multilayer actuator (1) without poling cracks.

Abstract: According to various production methods for producing a piezoceramic multilayer actuator, in the course of the production method, multilayer locks (10) are electrochemically or mechanically processed in such a way that a recess structure is obtained. The lateral surfaces (22; 24) of the electrodes (20) inside these recesses are electrically insulated using the slip casting method in order to be able to contact the remaining electrodes by imprinting an outer metallization.

Abstract: In a method for producing a multilayer encapsulation (1) of a piezo actuator (5) such that the piezo actuator (5) is protected towards the outside without having to use an additional enveloping housing-type structure, in order to produce the multilayer encapsulation (1), an electrically insulating elastic layer (10) is first applied to the surface of the piezo actuator (5), whereupon a metallic layer is applied to the electrically insulating elastic layer (10) so as to planarly cover the same.

Abstract: In a method for the production of a gradient encapsulation layer 20 on a piezoelectric actuator 1, based on this gradient encapsulation layer 20, the piezoelectric actuator 1 does not 5 require an additional housing-like enveloping structure in order to be protected externally. The gradient encapsulation layer 20 is produced by cold gas spraying of particles having different material properties.

Abstract: A contact mat (9) for electrically contacting an actuator, particularly a piezo actuator for an injector of an injection system has several electrically conductive wires (5) that are placed next to each other and several mechanical transversal connections located between the individual wires (5). The transversal connections consist of one respective terminal post (3, 4, 20-22) of the actuator.

Abstract: High pressure discharge lamp (20) with improved ignitability. A spiral pulse generator (1) that is directly mounted inside the outer piston (12) of the lamp is used for igniting the high pressure discharge lamp.

Abstract: A support assembly for a piezoelectric actuator (15), in particular for a piezoelectric actuator for driving an injector for the injection system of an internal combustion engine has a holder (5-10) for spatially securing a piezoelectric stack (2) and two associated connection pins (11, 12) for electrically contacting the stack (2). The support assembly is configured as a single support, which only holds a single piezoelectric stack (2) with two associated connection pins (11, 12).

Abstract: A piezoactuator has at least one piezoelectric-active partial stack with piezoceramic layers arranged one over the other with piezoceramic material and electrode layers arranged between the piezoceramic layers, at least one piezoelectric-inactive terminating region arranged over the partial stack and at least one transition region between the partial stack and the terminating region, the partial stack, the terminating region and the transition region all connected together to give a monolithic complete stack. The transition region has a transition region stack with piezoceramic layers arranged one over the other and electrode layers arranged between the piezoceramic layers both have a form and are arranged on each other such that, in the stack direction of the transition region stack, from piezoceramic layer to piezoceramic layer there is a successive rotation about a main axis of the polarity and/or a rotation of the main axis of the electric control is provided.

Abstract: The invention relates to a receiving sleeve for a piezoelectric actuator, in particular for a piezoelectric actuator for driving an injector of an injection system in an internal combustion engine. Said sleeve comprises a first sleeve part (1) and a second sleeve part (2), the first sleeve part (1) being connected to the second sleeve part (2) when the sleeve is assembled. In addition, the inventive receiving sleeve comprises an anti-rotation element (6, 8) for maintaining a predefined angular position between the first sleeve part (1) and the second sleeve part (2).

Abstract: A contact mat (9) for electrically contacting an actuator, particularly a piezo actuator for an injector of an injection system has several electrically conductive wires (5) that are placed next to each other and several mechanical transversal connections located between the individual wires (5). The transversal connections consist of one respective terminal post (3, 4, 20-22) of the actuator.

Abstract: A piezoelectric component includes at least one monolithic piezo element, having at least a first electrode layer, at least a second electrode layer and at least one piezoceramic layer located between the electrode layers. The piezoelectric component is characterized in that at least between one of the electrode layers and the piezoceramic layer is provided an uncoupling layer which is in direct contact with at least one of the layers for mechanically uncoupling the electrode layer and the piezoceramic layer. A method for producing such a piezoelectric component is disclosed. The piezoelectric component is used in automotive technique for controlling an internal combustion engine injection valve.

Abstract: A piezoceramic composition has a nominal empirical formula of Pb1-aREbAEc[ZrxTiy(FefWw)z]O3. RE is a rare earth metal with a fraction b and AE is an alkaline earth metal with a fraction c. Iron is present with an iron fraction f·z, and tungsten with a tungsten fraction w·z. In addition, the following relationships apply: a<1; 0=b=0.15; 0=c=0.5; f>0; w>0; 0.1=f/w=5; x>0; y>0; z>0 and x+y+z=1. A method of producing a piezoceramic material using the piezoceramic composition has the steps: a) provision of a green ceramic body with the piezoceramic composition, and b) heat treatment of the green body, a piezoceramic of the piezoceramic material being produced from the piezoceramic composition. The heat treatment encompasses calcining and/or sintering. The piezoceramic composition undergoes compaction at below 1000° C.

Abstract: An electrical passivation of surfaces of an electronic component which have electrodes is intended to be carried out in simple and effective fashion and also to be stable in chemically and thermally unfavourable environments. For the passivation, a plastic film, for example made of epoxy, is laminated onto the surface. Applications are in fuel injection systems, for example.

Abstract: A piezoceramic composition of a calculated empirical formula Pb1-aREbAEc[ZrxTiy(NinMom)z]O3, wherein RE represents a rare earth metal having a rare earth metal content b, AE represents an alkaline earth metal having an alkaline earth metal content c, nickel is provided with a nickel content n.z, and molybdenum is provided with a molybdenum content m.z. Furthermore, the following correlations apply: a<1; 0=b=0.15; 0=c=0.5; n>0; m>0; 0.1=n/m=5; x>0; y>0; z>0, and x+y+z=1. In a method for producing a piezoceramic component a) a green ceramic member containing the piezoceramic composition is supplied; and b) the green member is subjected to a thermal treatment such that the piezoceramic material of the component is produced from the piezoceramic composition. The thermal treatment encompasses calcining and/or sintering of the piezoceramic composition. The piezoceramic composition is compressed below 1000° C.

Abstract: A piezoceramic multilayer actuator (10) has a plurality of piezoceramic layers (12), a security layer (20) and a plurality of inner electrodes (16, 18). The piezoceramic layers (12) has a piezoceramic first material sintered at a sintering temperature. The security layer (20) has a second material and is disposed between two piezoceramic layers (12). Each of the plurality of inner electrodes (16, 18) has a third material and is deposited between two piezoceramic layers (12). The degree of sintering of the second material is lower than the degree of sintering of the third material.

Abstract: In a method of manufacturing a piezoceramic multilayer actuator (10), a plurality of green layers is provided, wherein the green layers are to be converted to piezoceramic layers (12) with a piezoceramic material in a subsequent step of heating. A security layer material mixture with a second material (32) and particles (30) embedded in the second material (32) is provided, wherein the particles (30) have a third material different from the first material and different from the second material (32). The security layer material mixture is laminated between two piezoceramic layers (12), thereby forming a green stack. The green stack is heated to a sintering temperature, wherein the green layers are converted to the piezoceramic layers (12), and wherein a chemical reaction of the third material degrades the mechanical connection of the piezoceramic layers (12) by the security layer (20).

Abstract: A piezoceramic multilayer actuator (10) has a plurality of piezoceramic layers (12) and a security layer (20) disposed between two piezoceramic layers (12). The piezoceramic layers (12) have a piezoceramic first material sintered at a sintering temperature. The security layer (20) has a second material (32) and particles (30) at least partially embedded in the second material (32). The particles (30) have a third material different from the first material and different from the second material (32). An adhesion between the third material and the first material is weaker than an adhesion between the second material (32) and the first material.

Abstract: A piezoelectric component (1) has at least one monolithic piezo element (10) having an electrode layer (101), at least one further electrode layer (102), at least one piezoceramic layer (103) disposed between the electrode layers and at least one predetermined breaking point (100) which, in the event of mechanical overload of the piezo element, leads to the formation of a specific crack (110) in the monolithic piezo element, wherein the predetermined breaking point includes the electrode layer. The component is, for example, a piezoelectric actuator with a monolithic actuator body (2) in which piezo elements with predetermined breaking points and further piezo elements (11) without predetermined breaking points are arranged one on top of the other and sintered collectively.