Key Facts at a Glance
Hard piezoceramic materials are are the preferred choice when power, efficiency and stability are more important than maximum sensitivity. They are characterized by:
- Low dielectric and mechanical losses
- High mechanical quality factors
- High resistance to depolarization
- High thermal stability
- Efficient resonant operation
- Reliable performance under demanding loads
Power transducers demand materials that perform reliably under high electrical drive levels, intense mechanical stress and continuous operation. CeramTec's hard piezoceramics are engineered for exactly these conditions. From industrial ultrasonics to sonar and medical devices, our SONOX® and PZT materials convert electrical energy into mechanical vibration efficiently, repeatedly and at high amplitudes.
What are Hard Piezoceramic Materials?
Hard piezoceramics are based on modified lead zirconate titanate (PZT). Their composition restricts the movement of ferroelectric domain walls. This results in low dielectric and mechanical losses and high stability under electrical and mechanical load.
The term "hard" does not describe mechanical hardness. It describes the restricted mobility of the domain walls inside the material.
Comparison with soft piezoceramics
Soft piezoceramics are optimized for high piezoelectric response and sensitivity. Hard piezoceramics are optimized for power, efficiency and stability. They are the preferred choice when these properties matter more than maximum sensitivity.
What are typical Applications for Piezoceramic Power Transducers
| Market | Application |
|---|---|
| Automotive | Level sensors (oil & fuel) |
| Industrial | Ultrasonic cleaning, ultrasonic welding, ultrasonic material processing, non-destructive testing (NDT), level sensors, echo sounders & fish finders |
| Medical Equipment | Ultrasonic diagnostics & therapy, ultrasonic scalpels & nebulizers, lithotripters, surgical knives, plaque removal |
| Security & Defence | Sonar technology & hydroacoustics, underwater object recognition |
Hard Materials for Power Transducers
CeramTec offers a portfolio of proven piezoceramic materials specifically optimized for high-power applications. Key grades include SONOX® P4, SONOX® P8, PZT401, and PZT807.
| Property | Value / Characteristic |
|---|---|
| Permittivity (εᵣ) | 900 – 1,400 |
| Mechanical Quality Factor (Qm) | 500 – 2,000 |
| Dielectric Loss | Low |
| Curie Temperature | High |
| Coercive Field Strength | High |
| Operating Frequency Range | 20 kHz to several MHz |
These materials are specifically designed to withstand both high electrical driving voltages and intense mechanical (pressure) loads - making them the material of choice for demanding high-performance ultrasonic applications.
