Passivation material for an electric component and piezoelectric component in the form of a multilayer structure

A technology for piezoelectric components and electrical components, applied in electrical components, piezoelectric/electrostrictive/magnetostrictive devices, components of piezoelectric devices or electrostrictive devices, etc. problems, to achieve the effect of simplified manufacturing, simplified process technology conversion, high electrical insulation and breakdown resistance

Inactive Publication Date: 2004-09-08
EPCOS AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, passivation materials based on self-adhesive silicones have serious disadvantages especially in the operation of piezoelectric actuators of diesel injectors
Therefore, currently used silicone-based passivation materials are not very resistant to swelling when wetted with diesel or rapeseed methyl ester (RME)

Method used

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  • Passivation material for an electric component and piezoelectric component in the form of a multilayer structure
  • Passivation material for an electric component and piezoelectric component in the form of a multilayer structure

Examples

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Embodiment Construction

[0055] figure 1 A piezoelectric component 10 in the form of a piezoelectric actuator is represented in a multilayer structure. The piezoelectric actuator 10 is a multilayer body 18 consisting of a plurality of piezoelectric ceramic layers 11 and electrode layers 12 , 13 . Here, the electrode layers 12 and 13 have different polarities respectively, wherein the electrode layers with the same polarity are respectively referred to as the first electrode layer 12 or the second electrode layer 13 . The electrode layers 12 and 13 of the same polarity are each connected to an outer metallization 15 .

[0056] Inactive insulating regions 14 can also be seen, which are arranged alternately at opposite corners of successive electrode layers 12 , 13 which here do not cover the entire cross-section of the multilayer body. This structure allows all first electrode layers 12 or all second electrode layers 13 with the same polarity to be connected together via a common vertical outer metall...

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Abstract

The invention relates, inter alia, to a piezoelectric component (10) in the form of a multilayer structure, wherein a piezoelectric ceramic layer (11) and an electrode layer (12, 13) are always alternatingly superimposed to form a stack (18), wherein each electrode layer (12, 13) extends at least in certain areas to at least one side surface (19) of the stack (18). In order to protect the component (10) against short circuits and flashovers, a passivation (20) is provided on the at least one side surface (19). In order to ensure that bonding of said passivation (20) on the surface (19) of the component (10) always remains unaltered, especially when cracks emerge in the ceramic layers (11), the passivation (20) is formed by a passivation material having a tearing strength that is smaller than the bonding strength of the passivation material on the surface (19) of the component (10). The invention also relates to advantageous passivation materials, wherein said materials can be, for instance, a polyurethane, a fluorine-silicone rubber and the like.

Description

technical field [0001] The invention relates firstly to a passivation material for electrical components according to the preamble of claim 1 and to a multilayer piezoelectric component according to the preamble of claim 11 . Background technique [0002] Piezoelectric components, which can be produced, for example, as piezoelectric actuators in the form of multilayer components with a plurality of alternating piezoelectric ceramic layers and electrode layers, are becoming more and more important in modern electrotechnical devices. For example, piezoelectric actuators are used as servo drives related to valves and the like. [0003] A known piezoelectric actuator is described in detail, for example, in DE19646676C1. In this piezoceramic the effect is utilized that the piezoceramic is charged under mechanical pressure or tension and, on the other hand, expands and contracts along the main axis of the ceramic layer when a voltage is applied. In order to simplify the length e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/04H01L41/083H02N2/04
CPCH01L41/083H01L41/0533H01L41/0472H10N30/872H10N30/883H10N30/50
Inventor D·克拉梅C·舒赫
Owner EPCOS AG
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