Hydrogen Absorption Kinetics of LaFe11.6Si1.4 Alloy and Its Hydride Stability

Abstract:

The hydrogen absorption kinetics of the magnetic refrigeration material LaFe11.6Si1.4 alloy at different temperatures was investigated by the P-C-T testing. It is found that increasing temperature conduces to form the hydride of LaFe11.6Si1.4 at 30~80 ℃. The hydrogen desorption P-C-T curves of LaFe11.6Si1.4 hydrides at different temperatures show that no hydrogen-desorption platform appears at a pressure of 0~0.4 MPa, and the hydrogen in the alloy gradually decreases with the decreasing of pressure. A thermal analysis is used to study the thermal stability of temperature for the hydride. The TG curve shows that the hydrogen in the alloy gradually releases with the increase of temperature up to a relatively little value at 60 ℃, then increases above 60 ℃. An effective method to regulate the hydrogen content in the alloy by increasing temperature or decreasing pressure then to controll the Curie temperature of alloy is presented in this article