Yovka D Dragieva

Title: Yovka D Dragieva: Innovator in Thermostable Amorphous Ferromagnetic Powders

Introduction

Yovka D Dragieva is a prominent inventor based in Sofia, Bulgaria. She has made significant contributions to the field of materials science, particularly in the development of thermostable amorphous ferromagnetic powders. With a total of 2 patents, her work has implications for various applications, including magnetic media recording.

Latest Patents

Yovka's latest patents focus on an apparatus and method for the manufacture of thermostable amorphous ferromagnetic powders. These powders contain iron, cobalt, or nickel, and include xylene in volumes ranging from 0.2 to 25%. Additionally, they may contain up to 20% chrome and boron by weight, along with lithium or magnesium in amounts from 0.1 to 2.0% by weight. The powders are designed to be resistant to oxidation at temperatures up to 250°C and possess a specific surface area of up to 160 m²/g. The manufacturing method involves the reduction of a solution containing various metal salts and a complexing agent, utilizing sodium borohydride as a reductant in the presence of sodium hydroxide. The process is conducted under a magnetic field, ensuring the solution is protected by an organic hydrophobic substance, xylene.

Career Highlights

Throughout her career, Yovka has worked with notable companies, including V M E I 'Lenin' and Quartal Darvenitza. Her experience in these organizations has contributed to her expertise in the field of materials science and engineering.

Collaborations

Yovka has collaborated with esteemed colleagues such as Dimiter T Butchkov and Zvetan K Nikolov. These partnerships have further enriched her research and development efforts.

Conclusion

Yovka D Dragieva stands out as an innovative inventor in the realm of thermostable amorphous ferromagnetic powders. Her patents and career achievements reflect her dedication to advancing materials science.