MLCC Ultrasonic Testing
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author：Hiwave
source：Hiwave
time：2025-02-20
catogory：Industry News
A Multi-layer Ceramic Capacitor (MLCC) is a specialized type of ceramic capacitor made by alternating layers of ceramic dielectric film and internal electrodes, which ……
A Multi-layer Ceramic Capacitor (MLCC) is a specialized type of ceramic capacitor made by alternating layers of ceramic dielectric film and internal electrodes, which are then co-fired at high temperatures to form a ceramic chip. External electrode paste is subsequently applied to both ends of the chip to complete the capacitor. Due to the complex internal stress distribution in MLCCs, their ability to withstand environmental stresses is limited; temperature variations, mechanical stress, and electrical overstress can all potentially lead to failure.
Traditional metallographic polishing analysis methods, which only examine one or a few locations, cannot comprehensively cover all potential defects. This limitation may result in defective products being incorrectly deemed acceptable, thereby increasing the risk of quality issues. In contrast, ultrasonic testing technology effectively overcomes this drawback by providing a clear visualization of defects throughout the entire MLCC structure. This method offers a more accurate quality assessment, not only enhancing product quality but also significantly reducing the risk associated with missed defect detection.
The working principle of an ultrasonic testing device is based on the penetration and reflection characteristics of ultrasonic waves to detect internal defects in objects. Ultrasonic waves can propagate through solids, liquids, and gases. When traveling through a homogeneous material, ultrasonic waves pass directly through the substance. However, upon encountering discontinuities or defects such as cracks or voids, the ultrasonic waves reflect at the interfaces between different materials. By analyzing these reflected waves, it is possible to accurately detect and locate defects.
In the field of industrial inspection, a commonly used ultrasonic scanning mode is the C-Scan mode, which is why ultrasonic testing technology is often referred to as “C-scan.” The C-Scan method provides an effective way to generate two-dimensional or three-dimensional images of the inspected object, making the location and size of defects immediately apparent. This significantly enhances the accuracy and efficiency of inspections. This method is not only suitable for quality control of various materials but is also widely applied in maintenance and repair processes to ensure the safe and reliable operation of equipment.
