Abstract
Composite materials can exhibit improved properties and/or new functions compared with single-phase materials. We consider the principles of composite effects and their typical applications, taking particularly piezo-composites. The geometry for two-phase composites can be classified according to the connectivity of each phase into 10 structures. Piezoelectric composite materials are especially useful for underwater sonar and medical diagnostic ultrasonic transducer applications (Combination Effect). PZT:polymer:carbon composites exhibit superior mechanical damping performance. Another type of composite comprised of a magnetostrictive ceramic and a piezoelectric ceramic produces an intriguing product effect, the magnetoelectric effect.
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