The Safety Characteristics of LaNi₅ Hydrides

Abstract

Experimental studies have been conducted to determine the limits of safety in handling, shipping, and usage of LaNi hydride. Emphasis has been given to the accident-oriented safety problems such as punctured containers, impact, explosion, shock, and external fire. Various aspects of hazards have been evaluated for bulk powders; the ignition temperature, the relative combustibility, flammability, shock sensitivity, impact sensitivity, electrostatic spark sensitivity and potential explosibility. Since the LaNi₅ hydrides break down to powders after repeated absorption and desorption of hydrogen, the ultimate interest in the safety considerations is with fine powders. A characterization study of the particles and particle size was included as part of the study. Another independent study was also made of the safety of dust clouds of LaNi₅ hydrides. The ignition sensitivity and explosion severity were determined, and an index of explosibility of dust clouds was established.