Preparation method of Mg-contained hydrogen storage alloy

Abstract

The invention belongs to the technical field of functional metal alloy materials and relates to a smelting method applicable to La-Mg-Ni series and Mg2Ni type hydrogen storage alloys, which comprises the following concrete steps of: weighing the components of the La-Mg-Ni series hydrogen storage alloy as ABy according to a stoichiometric proportion, wherein the A is LaxMg1-x, the B is Niy-zCz, and the C is Mn, Fe, Mo, Co, Al, Ti, Si, V, Cr, Cu, Zn, Zr, Nb, W, Hf, Ta, B, P or / and Sn, La, Mg and Ni, adding into a crucible of a medium-frequency induction smelting furnace, and placing on a feeding device in the furnace after carrying out surface processing on Mg blocks; carrying out vacuum pumping until the vacuum degree is 10-2 Pa, introducing He and Ar protective gases mixed according to a certain proportion until the air pressure in the furnace reaches 0.01-0.1MPa, regulating the power range to be 15-35kW, and controlling the temperature at 600-1300 DEG C until metals are molten; and stopping electrifying for 1-10 minutes, adding the Mg into the crucible through the feeding device in the furnace, regulating the power range to be 15-35kW, controlling the temperature at 600-1300 DEG C and casting after smelting for 1-10 minutes. The process has simple operation, good controllability, stable components of the prepared hydrogen storage alloy and lower cost and can realize low-cost and large-scale production.

Description

technical field [0001] The invention belongs to the technical field of functional metal alloy materials, and in particular relates to a kind of hydrogen storage alloy suitable for La-Mg-Ni series and Mg 2-x m x Ni 1-y N y The smelting of the hydrogen storage alloy and the preparation method of the Mg-containing hydrogen storage alloy. technical background [0002] In order to solve the problem of the depletion of natural energy and the environmental pollution caused by traditional energy, the rapid development of hydrogen storage alloys has solved the problem of difficult storage of hydrogen energy to a certain extent and improved the utilization rate of hydrogen energy. Due to the increasing demand for high-capacity secondary batteries and the requirements for environmental protection, countries all over the world are devoting themselves to the research and development of "green batteries" with high energy density, long life and no pollution. Metal hydride-nickel (Ni / MH...

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Problems solved by technology

China's No. 200810203955.1 patent relates to a method for preparing La-Mg-Ni-based hydrogen storage alloys by sintering, but there are still certain problems: 1) it is necessary to prepare La 2 Mg master alloy, this process increases the possibility of La-Mg-Ni based hydrogen storage alloy composition deviation; 2) The raw material metal needs to be ball milled before sintering, which increases the loss and oxidation of raw material; 2) This method needs to press the metal powder into The round cake of φ15mmx (3~5mm) is then sintered, the process is complicated, and it is not conducive to large-scale production

Chinese patent No. 02145510.1 involves a method of preparing Mg by self-propagating high-temperature synthesis and mechanical ball milling. 2 The method of Ni hydrogen storage alloy, but there are still some problems: the preparation process is divided into three steps of pressing, sintering and ball milling, and the process is complicated

However, Mg is a metal with very active chemical properties and a low melting and boiling point. In the La-Mg-Ni system and Mg 2 In the preparation of Ni-type hydrogen storage electrode alloys, because Ni has a high melting point, it must be kept at a high temperature during smelting, which intensifies the evaporation of Mg, resulting in unstable composition of the electrode alloy, which affects the La-Mg-Ni system during smelting and production. and Mg 2 Batch Composition Stability of Ni-type Hydrogen Storage Electrode Alloy

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