Hajime Nakajima

Title: The Innovations of Hajime Nakajima

Introduction

Hajime Nakajima is a notable inventor based in Ibaraki, Japan. He has made significant contributions to the field of materials science, particularly in the development of superalloys. With a total of three patents to his name, Nakajima's work has had a profound impact on high-temperature structural materials.

Latest Patents

One of Nakajima's latest patents is a Nickel-chromium-tungsten base superalloy. This improved superalloy possesses all the characteristics required of high-temperature structural materials for high-temperature gas-cooled reactors. It features high-temperature strength, corrosion resistance, good producibility, good hot workability, and resistance to embrittlement due to thermal aging. The composition of this superalloy consists essentially of 16-28% chromium, 15-24% tungsten (with the condition that chromium plus tungsten equals 39-44%), 0.01-0.1% zirconium, 0.001-0.015% yttrium, 0.0005-0.01% boron, up to 0.05% carbon, up to 0.1% silicon, up to 0.1% manganese (with the condition that silicon plus manganese is less than or equal to 0.1%), up to 0.1% titanium, up to 0.1% aluminum, and up to 0.1% niobium (with the condition that titanium plus aluminum is less than or equal to 0.1% and titanium plus aluminum plus niobium is less than or equal to 0.15%), with the balance being nickel and inevitable impurities, all percentages being on a weight basis.

Career Highlights

Hajime Nakajima has worked with prominent organizations such as the Japan Atomic Energy Research Institute. His expertise in materials science has allowed him to contribute to various projects that focus on the development of advanced materials for nuclear applications.

Collaborations

Throughout his career, Nakajima has collaborated with esteemed colleagues, including Tatsuo Kondo and Masami Shindo. These collaborations have further enhanced his research and development efforts in the field of superalloys.

Conclusion

Hajime Nakajima's innovations in the field of superalloys have made a significant impact