Hiroji Henmi

Title: Hiroji Henmi: Innovator in Sintered Iron-Based Alloys

Introduction

Hiroji Henmi is a notable inventor based in Kumagaya, Japan. He has made significant contributions to the field of materials science, particularly in the development of sintered iron-based alloys. With a total of 5 patents to his name, Henmi's work has had a considerable impact on the automotive industry.

Latest Patents

One of Henmi's latest patents is for a valve seat made of a Co-free, sintered iron-based alloy. This invention boasts excellent heat resistance, oxidation resistance, and wear resistance, making it suitable for internal combustion engines that utilize gas fuel. The valve seat is produced using a prealloy containing 12% or more by mass of chromium, along with hard particles that maintain high strength and hardness at elevated temperatures. The composition of the valve seat includes 5.0-20.0% of chromium, 0.4-2.0% of silicon, 2.0-6.0% of nickel, 5.0-25.0% of molybdenum, 0.1-5.0% of tungsten, 0.5-5.0% of vanadium, 1.0% or less of niobium, and 0.5-1.5% of carbon, with the balance being iron and inevitable impurities. Another significant patent involves an iron-based sintered alloy valve seat designed for high-power diesel engines, which incorporates an intermetallic compound with a Vickers hardness of 800-1200. The composition for this valve seat includes 1.2-1.6% of carbon and 0.80-1.35% of phosphorus.

Career Highlights

Hiroji Henmi has worked with prominent companies such as Kabushiki Kaisha Riken and Riken Corporation. His experience in these organizations has allowed him to refine his expertise in materials engineering and innovation.

Collaborations

Henmi has collaborated with notable coworkers, including Akiyoshi Ishibashi and Kimiaki Hashimoto. Their joint efforts have contributed to advancements in the field of sintered alloys.

Conclusion

Hiroji Henmi's innovative work in sintered iron-based alloys has positioned him as a key figure in