For the first time in Vietnam, scientists at the Institute of Engineering Physics (Hanoi University of Science and Technology) have successfully researched and developed amorphous magnetic materials with new magnetic properties and physical effects.
This material has been applied in the production of high-frequency transformers, contributing to reducing the weight of personal welding machines from 50 kg to just 5 kg, and ozone generators. Notably, with this technology, Vietnam has been able to manufacture and replace some military equipment domestically, eliminating the need for imports.
The Institute of Engineering Physics has produced nearly 3,000 components for replacement in military equipment. These components operate with technical specifications that match the high quality of those from the former Soviet Union. According to evaluations from many experts, the 5 kg personal welding machine produces fine, beautiful welds; the ozone generator has functionalities similar to American models but is produced in Vietnam at a price of 499,000 VND, significantly cheaper than imported machines. The “soul” of these machines lies in the application of amorphous magnetic materials.
Dr. Nguyen Hoang Nghi from the Institute of Engineering Physics stated: “The Institute is transferring the technology for producing amorphous magnetic materials to the M1 Defense Factory (Ministry of National Defense). With the superior characteristics of this magnetic material, the potential for applications in technical production and daily life equipment is very large in the future.”
Amorphous magnetic materials are essentially thin metal sheets (Fe, Co) combined with several additives, which are then introduced into a metal annealing system. A robotic arm is used to allow the material to flow down onto a high-speed rotating shaft, resulting in a metal strip being flung out, with a thickness of 0.03 mm. These ultra-thin metal strips cool, solidify, and crystallize quickly, causing the atoms not to arrange into a stable structure, thus allowing them to withstand high frequencies.
