Company Filing History:
2 out of 172 
2 out of 1,716 
2 out of 475 
Years Active: 1995-2008
Title: Kiyoshi Hirao: Innovator in Boron Carbide Technology
Introduction
Kiyoshi Hirao is a prominent inventor based in Nagoya, Japan. He has made significant contributions to the field of materials science, particularly in the development of boron carbide-based sintered bodies. With a total of 5 patents to his name, Hirao's work has advanced the understanding and application of these materials in various industries.
Latest Patents
One of Hirao's latest patents is focused on a boron carbide-based sintered body that boasts a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m. This invention includes two preferred embodiments. The first embodiment describes a boron carbide-titanium diboride sintered body, which is created by sintering a mixed powder of boron carbide, titanium diboride, and carbon under pressurized conditions. This sintered body comprises 95 to 70 mol % of boron carbide and 5 to 30 mol % of titanium diboride, with the boron carbide having a maximum particle diameter of 5 micrometers. The second embodiment details a boron carbide-chromium diboride sintered body that contains 10 to 25 mol % of chromium diboride. This sintered body achieves a relative density of at least 90%, with boron carbide particles having a maximum diameter of 100 micrometers. The abundance ratio of boron carbide particles of 10 to 100 micrometers to those with a diameter of 5 micrometers or less ranges from 0.02 to 0.6.
Career Highlights
Throughout his career, Kiyoshi Hirao has worked with notable organizations, including the Agency of Industrial Science and Technology and the National Institute of Advanced Industrial Science and Technology. His expertise in materials science has positioned him as a key figure in the development of advanced materials.
Collaborations
Hirao has collaborated with several professionals in his field, including Shuzo Kanzaki and Manuel E. Brito. These collaborations have further enriched his research and innovations in boron carbide technology.
Conclusion
Kiyoshi Hirao's contributions to the field of materials science, particularly through his patents on boron carbide-based sintered bodies, highlight his innovative spirit and dedication