Advanced Ceramic
![Advanced Ceramic](https://uploads-ssl.webflow.com/5fb2cd136f4b440b2e600962/5fb80378a50e3f91ba87b260_image-7-small.jpg)
CRACK DETECTION in CERAMICS
Resonance Ultrasonic Vibrations (RUV) Technology
- High accuracy: 91 – 99 percent
- High throughput: 2-5 seconds/cycle
- Non destructive
- In-line & Off-line configuration
![Manual RUV system](https://uploads-ssl.webflow.com/5fb2cd136f4b440b2e600962/5fecd24779132335982e596a_advanced%20ceramic1.jpg)
RUV TECHNOLOGY
The Resonance Ultrasonic Vibrations (RUV) technique was developed for off-line and in-line non-destructive crack and stress detection in ceramic materials. The RUV methodology relies on a deviation of the resonance frequency response curve measured on a sample with sub- millimeter length crack compared to identical non-cracked samples.
The RUV technology allows to (1) reject mechanically unstable ceramic objects before they are introduced into further processing, (2) identify objects with cracks and high stress in real-time to avoid in-line breakage, and (3) detect cracked ceramics before they are integrated into the final device to avoid product return from the field. RUV system also serves as a process control tool to increase yield by eliminating production flaws caused by mechanical defects.
FREQUENCY CURVE
Through a resonance frequency curve selected from a broad range (20 - 250 kHz), the RUV method enables screen out materials with hidden cracks. A crack introduced into ceramics alters the RUV peak parameters: amplitude, bandwidth and peak position. This is illustrated in Figure 1 for a set of ceramic rings. Specifically, the crack in the ring shows the following features: (1) a frequency shift of the peak position; (2) an increase of the bandwidth, and (3) a reduction of the amplitude. Therefore, the RUV approach is based on a fast measurement and analysis of a specific resonance peak and rejection of the wafer if peak characteristics deviate from the normal non-cracked wafers. Additional RUV feature allows stress inspection caused by package density variation.
![Figure 1: Deviations of RUV peak parameters caused by a crack](https://uploads-ssl.webflow.com/5fb2cd136f4b440b2e600962/5fecd2cc9fbd5a4a66d38442_advanced%20ceramic2.jpg)
The sensitivity of the system, which refers to the length of the cracks, is adjustable to the needs of the user. The rejecting method is based on a statistical approach. In case studies the accuracy of this method approaches 99%. RUV system is used in the production of solid oxide fuel cells and metalized ceramic rings.
IN LINE & OFFLINE CONFIGURATIONS
Fully automatic In-line, Off-line and Quality Control RUV Tools are currently available for ceramic products. For technical information and RUV system availability, please contact Ultrasonic Technologies at support page.