Masakazu Ohkita

Title: The Innovations of Masakazu Ohkita

Introduction

Masakazu Ohkita is a notable inventor based in Osaka, Japan. He has made significant contributions to the field of rare-earth magnets, holding a total of four patents. His work focuses on enhancing the properties and production methods of sintered magnets, which are essential in various technological applications.

Latest Patents

One of Ohkita's latest patents is a method for preparing rare-earth system sintered magnets. The objective of this invention is to provide rare-earth system sintered magnets, such as R–Fe–B and R–Co systems, that exhibit excellent magnetic properties, unique configurations, small sizes, thin wall thicknesses, and intricate geometries. This method allows for easy granulation of alloy powders and suppresses chemical reactions between rare-earth systems and binder substances, thereby reducing residual oxygen and carbon levels in the sintered products. Additionally, the production method improves flowability and lubricant capability during the forming process, enhancing dimension accuracy and productivity.

Another significant patent involves a powder mixture for producing rare-earth iron sintered magnets. This invention utilizes a fine R-Fe-B alloy powder, predominantly composed of 10-30 atomic % of rare earth elements, 2-28 atomic % of boron, and 65-82 atomic % of iron, with the possibility of replacing up to 50 atomic % of iron with cobalt. A boric acid ester compound, such as tributyl borate, is added as a lubricant, allowing for continuous compression molding without the need for mold lubrication. The resulting magnets demonstrate improved magnetic properties, including residual flux density and maximum energy product.

Career Highlights

Masakazu Ohkita has worked with prominent companies in the industry, including Sumitomo Special Metals Co., Ltd. and Sumitomo Metal Industries, Inc. His experience in these organizations has contributed to his expertise in the field of magnet technology.

Collaborations

Ohkita has collaborated with notable coworkers, including Yoshihisa Kishimoto and Wataru Takahashi. Their combined efforts have further advanced the development of innovative magnet technologies.

Conclusion

Masakazu Ohkita's contributions to the field of rare-earth magnets through his patents and collaborations highlight his significant role as an inventor. His innovative methods and focus on improving magnetic properties continue to impact various technological applications.