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Method for preparing hydrogen storing alloy powder

A technology for hydrogen storage alloy and alloy powder, which is applied in the field of manufacturing hydrogen storage alloy powder, can solve the problems of poor battery performance reproducibility, unstable alloy performance, slow melt cooling, etc., and achieves improvement of composition and structure uniformity, Comprehensive performance improvement, temperature uniformity effect

Active Publication Date: 2009-03-11
XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the ingot is thick (usually not less than 2cm), the melt cools slowly, the solidification time is long, and the segregation of elements (such as manganese and lanthanum, etc.) is prone to occur.
Through subsequent heat treatment, the degree of segregation can only be reduced to some extent, but it is difficult to eliminate, which leads to the instability of alloy properties
After being made into a battery, the performance of the battery is poorly reproducible

Method used

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  • Method for preparing hydrogen storing alloy powder
  • Method for preparing hydrogen storing alloy powder
  • Method for preparing hydrogen storing alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: The process steps of this embodiment are given below.

[0036] 1) Batching and composition control: Use a polishing machine and a dryer to pretreat the raw materials to remove some impurities and moisture in the raw materials. The raw materials are nickel, misch, magnesium, cobalt, manganese, aluminum and copper, and the misch Containing "lanthanum, cerium, praseodymium, neodymium" after refining each raw material and its content (in Kg) is nickel: lanthanum: cerium: praseodymium: neodymium: magnesium: cobalt: manganese: aluminum: copper = 55:5:15 :1:2:1.5:7:4.5:1.2:2.5;

[0037] 2) Melting process: use a vacuum induction melting furnace to melt the raw materials at a temperature of 1500 ° C, pour the melt on the quenching belt equipment, and the cooling rate is 5×10 5 K / s, made of hydrogen storage alloy flakes with a thickness of 0.2mm;

[0038] 3) Annealing process: annealing the fabricated hydrogen storage alloy flakes in a vacuum annealing furnace, t...

Embodiment 2

[0069] Example 2: Similar to Example 1, ingredients and composition control: use a polishing machine and a dryer to pretreat the raw materials to remove some impurities and moisture in the raw materials, and the mixed rare earths contain "lanthanum, cerium, praseodymium, and neodymium" The refined raw materials and their contents (in Kg) are nickel: lanthanum: cerium: praseodymium: neodymium: magnesium: cobalt: manganese: aluminum: copper=55:10:25:0.3:3:3:8:5 :1:2; Melt the raw materials at a temperature of 1400°C, pour the melt on a quenching belt equipment, and the cooling rate is 6×10 5 K / s, made into a hydrogen storage alloy sheet with a thickness of 0.15mm. Anneal the prepared hydrogen storage alloy flakes, the annealing temperature is 900°C, and the annealing time is 8h; the annealed hydrogen storage alloy flakes are made into powder in an inert atmosphere of 5 MPa after nitrogen and argon are compressed by an air compressor, Obtain hydrogen storage alloy powder.

Embodiment 3

[0070] Embodiment 3: Similar to Example 1, each raw material and its content (in Kg) after refinement of "lanthanum, cerium, praseodymium, neodymium" contained in the mixed rare earth are nickel: lanthanum: cerium: praseodymium: neodymium: magnesium: Cobalt: Manganese: Aluminum: Copper = 55:15:8:1.5:2.5:0.1:5:6.5:2.5:3 The raw materials are smelted at a temperature of 1300°C, and the melt is poured on the quenching belt equipment, and the cooling rate is 8×10 5 K / s, made into a hydrogen storage alloy sheet with a thickness of 0.25mm. The hydrogen storage alloy flakes were annealed, the annealing temperature was 800°C, and the annealing time was 5h; the annealed hydrogen storage alloy flakes were compressed by an air compressor to form a powder in an inert atmosphere of 5 MPa, Obtain hydrogen storage alloy powder.

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Abstract

The invention relates to the making of stored hydrogen alloy powder. It is cheap, with great improvement in discharge capacity, recycling life and high power discharge feature. It pretreats the material with polishing and drying machines, smelting the material to form into alloy thin plate and annealing, powdering the alloy in inert atmosphere to get the alloy powder. It is easy to adjust the grain, suitable for big current discharge.

Description

technical field [0001] The invention relates to the manufacture of an alloy, in particular to the manufacture of a hydrogen storage alloy powder which is mainly used as the negative electrode material of a nickel-hydrogen battery. Background technique [0002] Due to the toxicity of cadmium in nickel-cadmium batteries (Ni-Cd), which is widely used at present, the disposal of waste batteries is complicated and the environment is polluted. As a new type of upgraded secondary battery, nickel-cadmium batteries are currently widely used Ideal replacement for batteries. Its electrochemical capacity is 1.5 to 2 times that of nickel-cadmium batteries, and it does not contain cadmium, so it has no pollution to the environment, and its charging and discharging life can generally reach more than 1,000 times. Ni-MH batteries are mainly used in small civilian batteries, portable electric tools, electric bicycles and motorcycles, hybrid vehicles, etc. Due to the increasing depletion of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/08
Inventor 黄长庚钱文连陈焕然张永健朱桂容
Owner XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO
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