Papers by Author: Kohmei Halada

Abstract: The concept of environmental conscious materials, ecomaterials, is reviewed. It has dispersed and recognized in the world as contributing to a sustainable society. Advanced models for secondary materials utilization, environmental benign processes and new material recycling systems are introduced.

Abstract: In this research, the effect of the aluminum addition to cast iron on damping property was investigated by central vibration method, dynamic mechanical analysis, ultrasonic attenuation measurement and impact sound method. All measurement results indicated that the addition of aluminum improve the damping property of cast iron.

Abstract: The research was made on how ecomaterials are currently used in Japan. All the information was obtained from 2001 to 2004 year version environmental reports on the Web-sites of the organizations concerned. In this paper, about 3900 ecomaterials produced by approximately 280 listed companies on the stock market were researched and classified into six categories. The number of ecomaterials produced in Japan has doubled in these several years and research activities in this field seem to be getting rather well-balanced. Our effort is focused on the analysis of the characteristics of "Greener process" and "Greener resource" type ecomaterials. The ecomaterials of each industry have their own characteristics according to an industry to which they belong. And each industry still has its own particular environmental subject to tackle.

Abstract: Hybrid atomization is a new atomization technique that combines gas atomization with centrifugal atomization. This process can produce fine, spherical powders economically with a mean size of about 10 μm diameter and a tight size distribution. Experiments on the process were carried out using a Sn-9 mass% Zn alloy to investigate the influence of processing parameters on powder characteristics in hybrid atomization. The primary atomization mechanism under normal hybrid atomization conditions is predicted to be direct drop formation mode.