Disc piezoelectric ceramic

Buyers must prioritize Resonant Frequency (fr) and Anti-resonant Frequency (fa) to ensure the component matches the circuit's operating requirements. Additionally, the Piezoelectric Charge Constant (d33) is critical as it determines the displacement or voltage sensitivity. For high-power applications, look for materials with a High Mechanical Quality Factor (Qm) to minimize heat generation and energy loss. Ensure the Dielectric Dissipation Factor (tan δ) is as low as possible, typically <0.5% for PZT-8 materials, to maintain efficiency during continuous operation.

The choice depends on the usage scenario. PZT-4 (Hard PZT) is ideal for ultrasonic cleaning and high-power sensing due to its high power handling and low dielectric loss. PZT-8 is preferred for high-intensity ultrasonic welding or surgical tools because it offers even lower loss under high-drive conditions. For precision positioning or low-power sensors, PZT-5 (Soft PZT) is better suited due to its high sensitivity and large displacement constants, though it is more prone to depolarization under high stress.

Suppliers must provide RoHS (Restriction of Hazardous Substances) and REACH certifications, as piezoelectric ceramics often contain lead (PZT stands for Lead Zirconate Titanate), which requires specific exemptions for global markets. Furthermore, ensure the manufacturer follows ISO 9001:2015 for quality management. For medical or automotive applications, verify if the supplier meets ISO 13485 or IATF 16949 standards respectively to ensure long-term reliability and traceability.

Request information on the Electrode Material, typically Silver (Ag) or Nickel (Ni). Silver electrodes should be tested for Adhesion Strength to prevent peeling during soldering. The surface should be free of micro-cracks, which can be detected through Scanning Electron Microscopy (SEM) or ultrasonic testing. Ask for a Capacitance Stability Test report to ensure the disc maintains its properties across the intended temperature range, especially if the application involves high thermal cycles.

The main risk is mechanical fracture or depolarization due to impact or extreme temperature fluctuations. Ensure the supplier uses vacuum packaging or specialized foam trays to prevent movement. For high-value orders, request shock-indicator stickers on the outer crates. It is also vital to confirm that the packaging protects against moisture and oxidation of the silver electrodes, which can degrade solderability during long sea freight transit.

Always utilize the Secured Trading Service on Made-in-China.com to protect your payment until the goods are verified. When negotiating, define a clear 'Defect Rate' threshold (e.g., <1%) in the contract. For bulk orders, insist on a Pre-shipment Inspection (PSI) by a third party like SGS or Intertek to test the frequency consistency of a random sample, as variations in ceramic batches can lead to high failure rates in your final assembly.

Verify the correct HS Code (typically 8541.60 or 3824.99) to determine applicable tariffs and avoid delays. Since PZT ceramics contain lead, ensure the Lead Exemption documentation is clearly stated in the commercial invoice to comply with environmental regulations in the EU or North America. Work with a freight forwarder experienced in Electronic Components to navigate specific 'Dual-Use' export controls if the ceramics are high-precision and could be used in sensitive industries.