Graded Piezoelectric Composite Material for Vibration Durability
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Solution Overview
Problem
Conventional piezoelectric power generation units face issues with durability due to detachment from substrates under repeated vibrations or impacts, and poor piezoelectric properties, with composite materials experiencing strain or stress gaps at interfaces leading to potential detachment and destruction.
Innovation Solution
A composite material for power generation is developed, comprising a ceramic material with piezoelectricity and a polymer, where the ceramic content rate changes continuously and gradually along a predetermined direction, preventing sudden changes in the interface that could cause cracking and enhancing durability, and utilizing laminated piezoelectric thin films with different ceramic content rates and heat treatment to maintain piezoelectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric ceramic material is attached to substrate with adhesive, then piezoelectric power generation is achieved, but the material may detach under repeated vibrations or impacts
Solution Approach 1:
The piezoelectric ceramic material is integrated directly into the polymer matrix to form a composite material, eliminating the need for separate adhesive attachment. The ceramic particles are dispersed throughout the polymer, creating a unified structure that prevents detachment under vibration and impact.
Solution Approach 2:
A composite material is formed by combining piezoelectric ceramic particles with a polymer matrix. This composite structure provides both the piezoelectric functionality of the ceramic and the flexibility and durability of the polymer, resolving the contradiction between achieving piezoelectric power generation and resisting vibration/impact damage.
2Reliability
If high volume percent concentration of piezoelectric particles is used, then piezoelectric performance is improved, but bending resistance deteriorates
Solution Approach 1:
The patent distributes piezoelectric particles non-uniformly within the polymer matrix, creating regions with different particle concentrations. This local variation in quality allows optimization of both piezoelectric performance (in regions with higher particle concentration) and bending resistance (in regions with lower particle concentration), resolving the contradiction between these two properties.
3Strength
If piezoelectric composite material with ceramic particles in polymer is used, then bending resistance is improved, but piezoelectric properties deteriorate
Solution Approach 1:
The patent optimizes parameters including the volume fraction of ceramic particles, particle size distribution, and polymer matrix composition to achieve a balance between bending resistance and piezoelectric properties. By carefully controlling these parameters, the composite material achieves both improved bending resistance and maintained piezoelectric functionality.
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
The composite material exhibits superior durability and piezoelectric properties, resisting vibrations and impacts without the need for attachment to substrates, with improved energy harvesting efficiency due to continuous ceramic content changes and optimized piezoelectric constants.
Implementation Method 1
a piezoelectric material which can change mechanical energy into electrical energy... a ceramic material having piezoelectricity and a polymer having piezoelectricity
Data Source
AI summary
A composite material for power generation having high durability and relatively superior piezoelectric properties, and a method of manufacturing the composite material for power generation. The composite material for power generation has a plate-like shape having a predetermined thickness, and comprises a ceramic material having piezoelectricity and a polymer having piezoelectricity, and is configured so that the content rate of the ceramic material changes continuously and gradually along the thickness direction. It can be manufactured by laminating multiple types of piezoelectric thin films including a ceramic material having piezoelectricity and a polymer having piezoelectricity and having different content rates of the ceramic material so that the content rate of the ceramic material gradually changes along their thickness direction, and then performing heat treating.