On January 6, the Ministry of Science and Technology convened a national evaluation council to review and formally accept the project entitled “Research and Fabrication of Piezoelectric Transducers for Hydroacoustic and Ultrasonic Devices” (Code: ĐTĐL.CN 34/24). The project was headed by Assoc. Prof. Vo Thanh Tung, with the University of Sciences, Hue University (HUSC) as the host institution.

The evaluation council brought together leading experts in physics and materials science. It was chaired by Prof. Nguyen Dai Hung of the Institute of Physics under the Vietnam Academy of Science and Technology (VAST), with Prof. Chu Duc Trinh from the VNU University of Engineering and Technology serving as Vice Chair. Council members also included representatives from prominent research institutes and universities nationwide.

Over a three-year period, the project successfully achieved all set objectives, underscoring the technological capability of Vietnamese scientists in mastering piezoelectric materials and components. The research team fabricated 500 grams of hard piezoelectric ceramic (TH3-A) and 500 grams of soft ceramic (CH-3), both demonstrating high performance, with the piezoelectric coefficient (d33) reaching up to 600 pC/N—meeting technical requirements for specialized hydroacoustic and ultrasonic devices.

In addition, the team produced 100 grams of lead-free piezoelectric material with a Curie temperature of 350°C, contributing to the development of environmentally friendly materials aligned with sustainable technology trends. The project also supplied 100 disc-type piezoelectric transducers featuring stable internal resistance and capacitance, ready for integration into signal transmission and reception systems.

Three pilot-scale technological process schemes, each with a capacity of approximately 1 kg per batch, were successfully established, incorporating optimized technical parameters across all stages - from milling and calcination to sintering and polarization. The project’s products were independently assessed and validated by the Naval Technical Institute (Ministry of National Defense) and other accredited agencies, confirming that they meet technical standards and are ready for practical application

The project generated substantial scientific and training outcomes, including one scholarly monograph on piezoelectric transducers; three papers published in SCIE-indexed journals; three domestic journal articles; three presentations at national scientific conferences; and one registered Utility Solution Patent granted in February 2025. In addition, the project contributed to human resource development by training seven master’s graduates and supporting three doctoral candidates, thereby strengthening the pool of high-quality expertise in applied physics and materials science.

The project outcomes demonstrate strong potential for application and technology transfer, particularly in hydroacoustic monitoring, marine scientific research, national defense, ultrasonic depth-measurement systems, and ultrasonic wine-aging device, underscoring their relevance for both industrial and civilian sectors.

The evaluation council highly appreciated the project’s scientific merit and practical applicability, and unanimously approved its official acceptance. Speaking at the session, Assoc. Prof. Tran Ngoc Tuyen, Vice Rector of HUSC, expressed sincere thanks to the Ministry and council members for their support and constructive feedback, reaffirming the University’s commitment to advancing the real-world application of the research results.

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