Piezoelectric Ceramic Groove Anchoring Insulating Film Adhesion
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Solution Overview
Problem
Existing multi-layer piezoelectric ceramic components face challenges in maintaining insulation properties and moisture resistance due to inadequate adhesion of insulating films, which affects the performance and reliability of piezoelectric actuators.
Innovation Solution
The design incorporates a cuboid piezoelectric ceramic body with internal electrodes and terminal electrodes, featuring grooves on the side surfaces to enhance the anchoring effect of insulating films, thereby improving adhesion and preventing displacement performance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating film is provided on the surface of the piezoelectric element to improve insulation properties and moisture resistance, then the adhesion properties of the insulating film deteriorate
Solution Approach 1:
The groove is formed on the side surface of the piezoelectric element before the insulating film is applied. This preliminary structural preparation creates anchoring features that enhance adhesion when the insulating film is subsequently deposited, resolving the contradiction between needing insulation and maintaining adhesion.
Solution Approach 2:
The groove introduces a third dimension (depth) to the otherwise flat side surface. This dimensional change creates surface area and geometric features that enable mechanical interlocking between the piezoelectric element and the insulating film, improving adhesion without compromising insulation properties.
2Strength
If the internal electrodes are covered with side margins to improve adhesion, then the displacement performance of the piezoelectric actuator is reduced
Solution Approach 1:
The groove is formed on the side surface before electrode placement, providing adhesion enhancement through the anchoring effect without requiring side margins to extend over the electrode edges. This preliminary structural feature allows the electrode to maintain its full width while still achieving improved adhesion.
Solution Approach 2:
The groove is localized to specific regions of the side surface, providing adhesion enhancement only where needed for structural integrity, while leaving the electrode edges exposed to maintain full displacement capability. This localized approach avoids the performance reduction caused by extensive side margin coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures strong adhesion of insulating films, maintaining insulation and moisture resistance while allowing for significant deformation and displacement performance of the piezoelectric ceramic component.
Implementation Method 1
uses deformation that is caused in the piezoelectric material by an inverse piezoelectric effect when a voltage is applied to the electrode
Implementation Method 2
adhesion properties of the insulating film are improved by an anchoring effect
Data Source
AI summary
A multi-layer piezoelectric ceramic component includes: a piezoelectric ceramic body having a cuboid shape having upper and lower surfaces facing in a thickness direction, first and second end surfaces facing in a length direction, and a pair of side surfaces facing in a width direction; first internal electrodes formed in the piezoelectric ceramic body and drawn to the first end surface; second internal electrodes formed in the piezoelectric ceramic body and drawn to the second end surface; a first terminal electrode formed on the first end surface; and a second terminal electrode formed on the second end surface, the first and second internal electrodes each having a width equal to a distance between the pair of side surfaces, at least one of the pair of side surfaces including a groove extending in non-parallel with the length direction.