Quaternary magnesium base hydrogen storage alloy, its producing method and use

Abstract

The invention discloses a quaternary magnesium-based hydrogen storage alloy, its production method and application. The quaternary magnesium-based hydrogen storage alloy is composed of Mg1.5-2Al0.02-0.08Ni0.5-1.0A0.05-0.1 , where A is V, Ti, Fe, Nd, Pd, dispersed nanocrystalline clusters and amorphous clusters are distributed in the microstructure. Alloy element powders are fully mixed and pressed into flakes, and then sintered in a vacuum sintering furnace. The obtained alloy samples are crushed, ball milled, and screened to obtain alloy powders with a particle size of less than 25 μm; weigh a small amount of fine Ni powder for ball milling , to obtain nanocrystalline Ni powder; Mg1.5-2Al0.02-0.08Ni0.5-1.0A0.05-0.1 alloy powder with a particle size below 25 μm, nanocrystalline Ni powder and second-phase active particles are fully mixed for high-energy By ball milling, an active hydrogen storage alloy material with nanocrystalline and amorphous structures is obtained, and the finished product is obtained after activation. The finished product has the characteristics of low hydrogen absorption / decomposition temperature, stable performance, practicality and low price.

Description

technical field [0001] The invention belongs to the field of materials, and specifically relates to a magnesium-based hydrogen storage alloy, as well as its preparation method and application. Background technique [0002] There are many hydrogen storage alloy systems, such as La-Ni system, Ti-Fe system, Zr system, rare earth system, etc., but they generally have disadvantages such as low hydrogen storage capacity, high hydrogen absorption / decomposition temperature, and high price, which seriously limit their use. use. Magnesium-based hydrogen storage alloys should arouse people's extensive attention. Binary or ternary magnesium-based hydrogen storage alloys (such as Mg-Ni, Mg-Mn-Ni) formed by adding alloying elements. These alloys have greatly improved hydrogen storage performance and electrochemical performance. The hydrogen storage capacity can be above 5%, but the dynamic / thermodynamic performance and corrosion resistance are poor. Accordingly, people have further add...

AI Technical Summary

Problems solved by technology

These two magnesium-based hydrogen storage alloys are prepared by mechanical ball milling alloying method to obtain alloy materials containing nanocrystalline structure, which have good hydrogen absorption / decomposition performance and electrochemical capacity up to 300mA·h·g -1 , the physical and chemical properties are significantly improved compared with binary and ternary magnesium-based hydrogen storage alloys, but its hydrogen absorption / decomposition temperature is higher (above 250 ° C), so its performance is unstable and its practicability is low.