Pb-Free Piezoelectric Device Multilayer Structure
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Solution Overview
Problem
Pb(Zr, Ti)O3 (PZT)-based piezoelectric materials, widely used due to strong piezoelectric characteristics, pose health and environmental risks due to lead toxicity and volatility during sintering, necessitating the development of Pb-free alternatives with comparable performance.
Innovation Solution
A Pb-free piezoelectric device utilizing a multilayer structure combination of piezoelectric materials with different characteristics, such as potassium sodium niobate (KNN) and barium titanate (BT) based materials, to enhance piezoelectric characteristics and reliability, while avoiding lead toxicity and environmental pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Pb(Zr, Ti)O3 (PZT)-based piezoelectric materials are used, then strong piezoelectric characteristics are achieved, but health and environmental pollution problems occur due to lead toxicity and volatility
Solution Approach 1:
The patent removes lead (Pb) from the piezoelectric material composition entirely, extracting the harmful element while maintaining the functional requirements through alternative Pb-free materials and multilayer结构设计
Solution Approach 2:
The patent employs composite piezoelectric materials consisting of multiple layers with different material compositions (e.g., KNN-based, BT-based, and other Pb-free piezoelectric materials) to achieve strong piezoelectric characteristics without lead, combining the advantages of different materials to compensate for individual limitations
2Object-affected harmful factors
If Pb-free piezoelectric materials are used to avoid lead toxicity, then environmental friendliness is improved, but piezoelectric characteristics and reliability are reduced
Solution Approach 1:
The patent uses composite structures combining multiple Pb-free piezoelectric materials (KNN-based, BT-based, and others) where each material layer contributes different characteristics, and their combination achieves overall strong piezoelectric performance and reliability without lead
Solution Approach 2:
The patent transitions from single-layer to multilayer structure, adding the dimension of layer stacking to achieve enhanced piezoelectric characteristics. The multilayer configuration allows different material properties to work synergistically, compensating for the limitations of individual Pb-free materials
3Reliability
If a multilayer structure combination of Pb-free piezoelectric materials is used, then piezoelectric characteristics and reliability are enhanced, but device complexity increases
Solution Approach 1:
The patent divides the piezoelectric device into multiple functional layers, each with specific material compositions and characteristics. This segmentation allows optimization of each layer's function while collectively achieving enhanced overall performance and reliability
Solution Approach 2:
Different regions (layers) of the piezoelectric device are assigned different material qualities and characteristics suited to their specific functional requirements. Each layer is optimized locally for its particular role, contributing to overall device enhancement without requiring uniform complexity throughout
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 solution effectively improves the piezoelectric characteristics and reliability of the device without using lead, reducing production restrictions and environmental harm, and provides a more environmentally friendly product with enhanced performance.
Implementation Method 1
piezoelectric materials can be configured to produce sounds... Pb(Zr, Ti)O3 (PZT)-based materials have a strong piezoelectric characteristic
Data Source
AI summary
Discussed is a piezoelectric device that can include a piezoelectric device layer, a first electrode layer at a first surface of the piezoelectric device layer, and a second electrode layer at a second surface different from the first surface of the piezoelectric device layer. The piezoelectric device layer includes a first vibration portion and a second vibration portion overlapping each other in a thickness direction of the piezoelectric device layer and having different characteristics.