5015 Enhancing effective thermal conductivity of Metal Hydrides by metal coating
Details
The effective thermal conductivities of TL-492 (Mm (La_<0.6-0.8>)Ni_<4.0>Mn_<0.2>Al_<0.2>) with hydrogen and helium have been examined at pressure from 0 to 2MPa, with before activation, after activation and oxidized status of metal hydrides. Experiment results show that pressure has great influence on effective thermal conductivity in low pressure range (<0.3MPa). And that influence decreases rapidly with increase of gas pressure. Metal coating method has been considered as an easy and efficient method to enhance the poor thermal conductivity of metal hydrides. At the present research, effective thermal conductivity of pure LaNi_<4.7>Al_<0.3> and its Cu metal coated alternative which have two weight percentages have been tested and compared with carbon fiber. It has shown that this method is not as effective as carbon fiber because its highest improvement is only 1.67 times comparing to pure LaNi_<4.7>Al_<0.3>, less than 1/3 of the efficiency of carbon fiber mixing method, and it takes much more additives.
