TW491898B - Fabrication method of hydrogen-absorbing alloy - Google Patents

Abstract

This invention provides a fabrication method of hydrogen-absorbing alloy, which is made of a metal mixture with a general formula of ABv. The mixture is melted under a argon (Ar) atmosphere of 5x10<SP>-1</SP>-10<SP>-2</SP> torr and a melting temperature of 1500-1650 DEG C for 30-40 minutes and then cooled to ambient temperature. Subsequently, a homogenization treatment is carried out at the same pressure and argon atmosphere by heating up to 850-1000 DEG C for 2-3 hours. A hydrogen-storing alloy powder with a dimension of 74 μm is obtained after the homogenized mixture is cooled and powdered.

Description

491898 ---------------- Month π_Revision V. Description of the invention (1 ^ '-This preparation is related to the production method of hydrogen-absorbing alloys, especially the manufacturing is easy to have hydrogen absorption south Hydrogen absorbing alloy with low volume, long life and low manufacturing cost. Hydrogen absorbing alloy can be used for communication, information, computer and consumer, etc. The so-called negative materials of rechargeable nickel-metal hydride batteries such as electronic products can also be used as power tools, Anode materials for high-power rechargeable nickel-metal hydride batteries, such as bicycles and electric motorcycles, are widely used. 之 Hydrogen-absorbing alloy's composition elements, the ratio of elements, and the difference in manufacturing methods will affect the hydrogen-absorbing alloy's hydrogen absorption Quantity, lifetime (number of uses), and manufacturing costs; must take into account the hydrogen absorption capacity, lifetime, and manufacturing costs of gold-absorbing alloys. It has commercial value. National Patent Bulletin No. 36 3288 "Hydrogen for Rechargeable Electrochemical Cells" "Retained alloy and its manufacturing method", the disclosed hydrogen retained gold includes expensive titanium and hafnium elements, and its manufacturing cost is relatively high ^ &lt; Japanese Patent No. 25998 published in 1998 and Mainland Patent Publication 1 tiger ^ ° Revealed by CN1240234A The manufacturing methods of gold-absorbing alloys all include the steps of chemical heat treatment. Because hydrogen is flammable and explosive, the gas manufacturing process is relatively dangerous and costly. The hydrogen absorbing alloy, which is easy to manufacture and low in cost, was completed after further research and experiment of Invention 2. The main purpose of the present invention is to provide a method for producing a hydrogen absorbing alloy with high toxicity and long toxicity. °, ', For other purposes, effects and embodiments of the present invention, please refer to the detailed description of the drawings as follows: Figure 8 is a detailed description of the schematic diagram: Fig. 1 is a flowchart of a method for manufacturing a gold-absorbing alloy according to the present invention. Heating temperature graph.

Page 4 4 ^ 1898 ^^ ___ Case No. 89120491_ Year Month __ V. Description of the invention (2) Figure 3 is a heating temperature curve of the homogenization treatment of the gold-absorbing alloy of the present invention. Fig. 4 is a graph showing the relationship between the hydrogen absorption and desorption amount and pressure of the A B5 plastic hydrogen absorbing alloy of the present invention. The general formula of the composition of the hydrogen-absorbing alloy of the present invention is ABv, where A is Lm (rich) metal, including Ce (wt) with a weight percentage of 5-25 wt%, Pr (wt) and M (within 20 wt%) “The rest is La (lanthanum); Bv includes metals such as Ni (nickel), (: 0 (cobalt), Mn (manganese), and A1 (aluminum), ν is the mole number of B (mole), 4. 3 $ ν $ 5 · 2; the general formula of Bv is NiwCoxMnyAlz, v = w + x + y + z; the values of w, x, y, and z are: 0.5 $ x $ 0 · 85, 0.2Sy $ 0.5 〇1 $ ζ $ 〇 · 4, the rest is W 〇 The embodiment of the present invention is ΑB5 type hydrogen absorbing alloy, wherein the composition of A is: 16-18. 5wt% Ce, 20wt% Pr + Nd, The rest are La; the composition of B5 is: 3.65 Mole Ni, 0.75 Mole Co, 0.31 Mole Mη, and -29 Mole A1. The method for producing hydrogen absorbing alloy according to the present invention, Please refer to Figures 1, 2, and 3, including the following steps: 1. A gold composition and design and material: The gold is based on the general formula ABv of the chlorine-absorbing alloy composition of the present invention. ^ Appropriate proportion of metal element with higher melting point in Bv alloy The crime is close to the inner wall of the crucible, and the metal with a lower melting point is placed near and below the axial centerline of the hanging steel, and Lm is removed from the metal with a higher melting point and a lower melting point. Between metals, a brilliant chain effect of 1 soil can be obtained. B. Each chain treatment:

It is less likely to damage the inner wall of the crucible. 491898

---- Case No. 8912 (um V. Description of the invention (3) Put the mixture with the alloy composition and design mentioned above into a thallium device for melting chain. The melting chain is under pressure less than 5 x (t〇rr, mmHg) ) And nitrogen (Ar) gas atmosphere, at a temperature of 1 50 0 — 1 65 (rc (Celsius)), continue to heat for 30-40 minutes, then cool to 丨 200- 丨 400 t and then ^^ gold melt inverted

Remove the hanging pin, put it into the cooling mold, and force it to reach room temperature (below 40 ° C) under vacuum or argon atmosphere. V 3 · Homogenization treatment: The hydrogen absorbing alloy after the cold part is heated in a pressure of less than 5 X 1-1 〇_2 Torr and nitrogen (Ar) gas atmosphere at a temperature of 850_100 ° C for 2-3 hours. After an hour, cool to room temperature in the same environment. 4 · Micronization treatment: After the homogenization treatment, the hydrogen absorbing alloy is crushed, granulated, ground and sieved to obtain 74 // m size, preferably 30-5 0 # m size Particles for use in Ni-MH batteries. The temperature of the melt chain treatment of the present invention is between 1550 ° and 1600 ° C. The alloy melt after the melt chain treatment is poured into a cooling mold at about 130 ° C. The temperature of the homogenization treatment is between Between 9 0 0-1 0 0 0 ° C, better manufacturing effects can be obtained. The hydrogen-absorbing alloy obtained by the above-mentioned alloy composition design and manufacturing method of the present invention has the advantages of high hydrogen absorption, high electric capacity, excellent electrochemical performance, long brother period, etc., and is implemented by the A B5 type hydrogen-absorbing alloy of the present invention. Examples are described as follows: AB5 hydrogen absorbing alloy: 1. Particle size: 74 // m or less. 2 · Scope of application ·· Rechargeable nickel-metal hydride batteries for 3C electronic products, electric tools, assisted bicycles, and electric vehicles. 491898 _ Case No. 89120491 _ month month day __ Five, the description of the invention (4) 3. Hydrogen absorption: the weight percent concentration of hydrogen absorption maximum absorption at 40 ° C _ 1.49wt% (see Figure 4 As shown). 4. Electric capacity: 36 0mAh / g (milliampere hour / gram). 5. Lifetime: After the nickel-metal hydride battery has been charged and discharged 5,000 times, its dischargeable depth (DOD) is still more than 90%. The above description is only an embodiment using the technical content of the present invention, and any modifications and changes made by those skilled in the art using the present invention are within the scope of the patent claimed by the present invention and are not limited to those disclosed in the embodiments.

In summary, the present invention can obtain a hydrogen-absorbing alloy that is simple to manufacture, high hydrogen absorption, high capacity, excellent electrochemical performance, long life, low cost, and commercial value. It has already been included in the patent requirements of the invention. Grant patents to benefit society.

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Claims (1)

1. A method for producing hydrogen absorbing alloy, which is composed of metals such as Lm (lanthanum-rich) (cobalt), Mn (manganese) and "(aluminum)" (nickel), Co at a pressure of less than 5 X Torr and argon (Ar) gas. Atmosphere% is a mixture, between 150-165 (TC, for 30-40 minutes of melting chain, processing: after the melt is poured into a cooling mold to cool to room temperature, under the same &amp; 々A 2 , Heating at a temperature of 850-1 0 00 t for 2-3 hours to enter the atmosphere and pressure management. Xibei Jianzhu 2 · According to the method of manufacturing hydrogen absorbing alloy described in the first scope of the patent application, the pot ^ metal mixture is melted The arrangement in the crucible before the chain treatment is: the metal elements with higher melting points among Zhongyu Co, Mη, and A1 are placed near the inner wall ', and the metal elements with lower melting points are placed on the crucible shaft Move towards the centerline and below, and place the Lm metal between the metal with a lower melting point than the metal with a lower melting point. 3. The method for manufacturing a hydrogen-absorbing alloy as described in item 1 of the scope of patent application, wherein the melting The temperature of the chain treatment is between 1550-16 0 ° C. 4. The hydrogen absorbing alloy described in item 1 of the scope of patent application Method, wherein the temperature of the homogenization treatment is between 900-100 ° C. 5 · The method for producing a hydrogen-absorbing alloy according to item 1 of the scope of patent application, wherein the alloy solution after the chain melting treatment Pour into a cooling mold between cooling to 1 2 0-1 4 0 0 ° C. 6 · The method for manufacturing a hydrogen-absorbing alloy as described in item 5 of the patent application scope, wherein the alloy melt is cooled to about 1 300 Pour into the cooling mold at ° C. 7 · The method for manufacturing hydrogen-absorbing alloys as described in item 1 of the scope of patent application, wherein the general formula of the metal composition of the hydrogen-absorbing alloy is ABS, and the composition of A is · 16-18.5wt Ce of 20%, Pr and Nd within 20wt%, the rest is La; the dagger 491898 Case No. 89120491 6. The composition of the scope of patent application is 3.65 moles of Ni, 07 and 0.29 moles. · 5 moles of Co, 0.31 moles of η 8 · After homogenizing treatment as described in item 1 of the scope of the patent application, the alloy melt is cold-born to the wind gold method, in which the principle is to obtain 74 micron (heart) size up to 7 USM: Micronization 9. Hydrogen-absorbing alloy as described in item 8 of the scope of patent application: Second powder J The micronization treatment includes crushing, granulating, grinding And sieve., Processing, to one inch thin, the best value is to make two grains for nickel-hydrogen batteries.