粉末冶金法による超磁歪材料の開発とアクチュエータへの応用

Abstract

This article presents the recent results from the study conducted by the authors on the application of giant magnetostrictive material. Tb0.3Dy0.7Fe1.95 is used to develop a novel pump which is able to feed at constant rate under high pressure. Two kinds of methods are employed for comparison purpose to fabricate the giant magnetostrictive material; Bridgman method and powder metallurgy method. The performance of the pump using each sample is closely evaluated and compared with each other. Prestress dependency of the magnetostrictive rods is also examined to illustrate distinctions between the two methods. It is found that the rod manufactured by powder metallurgy method shows less prestress dependency than that based on Bridgman method while the pump equipped with the latter sample yields a higher flow rate than the former does. It is also verified in terms of the efficacy of giant magnetostrictive materials on pumps which implies possible futuristic applications in human bodies by downsizing its power transmission mechanism.