The coating process of TiH2 particles with SiO2 layers, and the effect of the coating layer on hydrogen release characteristic of TiH2 powders were studied experimentally. The gelation rate of silicic acid is an impor...The coating process of TiH2 particles with SiO2 layers, and the effect of the coating layer on hydrogen release characteristic of TiH2 powders were studied experimentally. The gelation rate of silicic acid is an important factor for controlling the surface morphologies of coating layers. When the concentration of SiO2-3 is about 0.5 mol/L, the condensation rate of silicic acid is appropriate for the formation of a homogeneous and dense coating membrane. The results of hydrogen release at 700 ℃ show that TiH2 particles coated with silicon dioxide layers can efficiently delay the starting time of hydrogen release of TiH2 powders to 60100 s.展开更多
The technique to prepare TiH\-2 coated with layers of Al\-2O\-3 particles by heterogeneous nucleation method with HAc\|NaAc buffer solution as precipitation reagent was studied. The results show that the microscopic s...The technique to prepare TiH\-2 coated with layers of Al\-2O\-3 particles by heterogeneous nucleation method with HAc\|NaAc buffer solution as precipitation reagent was studied. The results show that the microscopic structure of Al\-2O\-3 coating layers depends on the pH value and Al\+\{3+\} concentration range in the solution. The homogeneous and compact coating layers with Al\-2O\-3\|coated TiH\-2 particles can be obtained at 0.05 mol/L and pH=4.5, after heating at 350 ℃. The hydrogen releasing of Al\-2O\-3/TiH\-2 particle is notably delayed with the increase of the temperature, and the delay effect can be used in the production of Al foams.展开更多
文摘The coating process of TiH2 particles with SiO2 layers, and the effect of the coating layer on hydrogen release characteristic of TiH2 powders were studied experimentally. The gelation rate of silicic acid is an important factor for controlling the surface morphologies of coating layers. When the concentration of SiO2-3 is about 0.5 mol/L, the condensation rate of silicic acid is appropriate for the formation of a homogeneous and dense coating membrane. The results of hydrogen release at 700 ℃ show that TiH2 particles coated with silicon dioxide layers can efficiently delay the starting time of hydrogen release of TiH2 powders to 60100 s.
文摘The technique to prepare TiH\-2 coated with layers of Al\-2O\-3 particles by heterogeneous nucleation method with HAc\|NaAc buffer solution as precipitation reagent was studied. The results show that the microscopic structure of Al\-2O\-3 coating layers depends on the pH value and Al\+\{3+\} concentration range in the solution. The homogeneous and compact coating layers with Al\-2O\-3\|coated TiH\-2 particles can be obtained at 0.05 mol/L and pH=4.5, after heating at 350 ℃. The hydrogen releasing of Al\-2O\-3/TiH\-2 particle is notably delayed with the increase of the temperature, and the delay effect can be used in the production of Al foams.
