ARTICLE FOR MAGNETIC HEAT EXCHANGE AND METHOD OF FABRICATING AN ARTICLE FOR MAGNETIC HEAT EXCHANGE

摘要

An article for magnetic heat exchange comprising a magnetocalorically active phase with a NaZn13-type crystal structure is provided by hydrogenating a bulk precursor article. The bulk precursor article is heated from a temperature of less than 5O°C to at least 300°C in an inert atmosphere and hydrogen gas only introduced when a temperature of at least 300°C is reached. The bulk precursor article is maintained in a hydrogen containing atmosphere at a temperature in the range 300°C to 700°C for a selected duration of time, and then cooled to a temperature of less than 5O°C.