CN1920076A - Method of producing hydrogen-storage alloy by discharge plasma sintering technique - Google Patents
Method of producing hydrogen-storage alloy by discharge plasma sintering technique Download PDFInfo
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- CN1920076A CN1920076A CN 200610113072 CN200610113072A CN1920076A CN 1920076 A CN1920076 A CN 1920076A CN 200610113072 CN200610113072 CN 200610113072 CN 200610113072 A CN200610113072 A CN 200610113072A CN 1920076 A CN1920076 A CN 1920076A
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- storage alloy
- discharge plasma
- plasma sintering
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Abstract
The invention relates the method for preparing store of hydrogen alloy with discharging plasma agglutination technology. The method comprises the following steps: mixing the LaNi3 powder, Mg powder and Ni powder, whose purity is 99.9% and coarseness is above 200mesh; putting them into SPS special die to press model; discharging plasma clinkering the die at vacuum, the heating speed being 50-150Deg/min, the temperature being 300-1000Deg.C, the pressure being 5-30MPa, the thermal insulation time being 3-15 min, cooling, and getting the product. The store of hydrogen alloy has long life and good activation energy.
Description
Technical field
The invention belongs to Metallic Functional Materials and secondary cell field, a kind of method for preparing hydrogen storage alloy with discharge plasma sintering technique particularly is provided.
Background technology
Generally raising along with Increase of population and human material, educational level; people are also increasing hastily to the demand of the energy; yet the reserves of fossil feedstock are limited; and be non-renewable; therefore the more important thing is the pollution of environment seriously day by day, traditional energy strategy meets a severe test, and national governments develop the novel energy of cleaning energetically for this reason; to alleviate increasingly serious energy dilemma, the protection life condition.
Hydrogen Energy is because of being the favor that the environment-friendly type energy enjoys people, but the storage of hydrogen is the bottleneck of hydrogen Economic development, and in the various store meanses of research at present, metal hydride is regarded as one of the most promising storage means.
The metal hydride of research has AB at present
5, AB
2, A
2Type B etc.AB
5Type is (with LaNi
5Being representative) capacity of hydrogen storage alloy reaches 300-320mAh/g, but be difficult to be further enhanced, can not satisfy the demand of futurity industryization from the point of long-term development; AB
2(with ZrV
2Being representative) activation performance of the hydrogen storage alloy of type is poor, differs greatly with industrial requirement; And A
2Type B is (with Mg
2Ni is representative) hydrogen storage alloy has high hydrogen-absorbing ability, but puts Hydrogen Energy power relatively poor (generally just can carry out at 200-300 ℃).Therefore the development research store hydrogen alloy has been a kind of trend.The AB that Recent study is found
3Type (La-Mg-Ni type) alloy just has good cyclical stability, high capacity and advantage such as with low cost.
Prepare AB now both at home and abroad
3The method of type (La-Mg-Ni type) mainly is: quick quenching technique, smelting process (cold crucible magnetic levitation melting, vacuum induction melting), ordinary sinter method and mechanical alloying method.(J.Alloys and Compounds 334 (2002) 219-223) has produced Mg-Ni-RE (RE=Y or Mm) alloy with quick quenching technique to Tony Spassov etc.But this method does not solve the subject matter of the existing cyclical stability difference of Mg base alloy; No. 00123177.4 application for a patent for invention of China prepares Mm with induction melting
1-x-y-zLa
xPr
yNd
zNi
aCo
bMnAl
dM
eAlloy, wherein Mm is a norium; China No. 200510033055.3 applications for a patent for invention be equipped with REMg with the ordinary sinter legal system
3The type hydrogen-storage alloy; China No. 94113952.2 patent applications prepare magnesium base hydrogen-storing alloy electrode with mechanical alloying method.Operational difficulty during the smelting method for preparing hydrogen storage alloy, repeatable bad; It is the length that expends time in that ordinary sinter method and mechanical alloying method prepare hydrogen storage alloy, and is difficult to produce in enormous quantities.
Based on improving above-mentioned deficiency, we have adopted discharge plasma sintering method (Spark Plasma Sintering is called for short SPS).
The SPS technology is a kind of DC-pulse flow-thru electrode agglomerating pressure sintering method (the device synoptic diagram is as shown in appendix) of utilizing.Its ultimate principle is to make inner each of sintered compact evengranularly self produce joule heating and make the particle surface activation by the plasma discharging that counter electrode feeds the instantaneous generation of dc pulse current, realizes sintering in pressurization.This technology has following characteristics: (1) sintering temperature is low, generally than low 100-200 ℃ of ordinary sinter temperature; (2) sintered heat insulating time weak point only needs 3-10min, only is 1/100 of ordinary sinter; (3) can obtain tiny, uniform tissue; (4) can obtain high compactedness material; (5) can make abnormity and large-size workpieces such as a watt shape, thin-walled ring.This method is simple to operate, can realize numerical control operating, and heat-up rate is fast, and weak point expends time in.
Experimental result shows, is equipped with hydrogen storage alloy with the SPS legal system and compares with smelting process, and the advantage that has is:
1, experiment is repeatable strong, easy to operate, weak point consuming time;
2, in the electro-chemical test process on the capacity attenuation degree, the alloy of SPS method preparation is littler than the attenuation degree of melting;
3, on the PCT curve: the alloy of SPS method preparation to put the hydrogen platform wideer than the melting.
Summary of the invention
The objective of the invention is to: a kind of method for preparing hydrogen storage alloy with discharge plasma sintering technique is provided, discharge plasma sintering technique is applied to the preparation of hydrogen storage alloy, by deep research preparation technology parameter of system and the relation between the alloy property, obtain optimum process parameters, obtain well behaved lanthanon hydrogen storage alloy.The preparation method may further comprise the steps:
With LaNi
3, Ni, Mg, Co powder press hydrogen storage alloy La
xMg
1-xNi
yProportion ingredient, the mixing of each element carry out die mould in the graphite jig of packing into then among the Coz (0.6≤x≤0.7,2.5≤y≤2.8,0.4≤z≤0.6); Carry out discharge plasma sintering more in a vacuum, the sintering process system is: rate of heating is 50-150 ℃/min, and sintering temperature is 300 ℃-1000 ℃, pressurization 5-30MPa, and soaking time 3-15min cools to room temperature then with the furnace.
The invention has the advantages that: the good cycling stability of the hydrogen storage alloy that makes (life-span is long), activation performance is good; Can realize numerical control operating, repeatability is good.
Description of drawings
Fig. 1 is the used discharge plasma sintering technique specific equipment of the present invention: wherein, and top electrode 1, lower electrode 2, seaming chuck 3, push-down head 4, mould 5, sample 6, thermopair 7, power supply 8.
Embodiment
Example: preparation La
0.7Mg
0.3Ni
2.5Co
0.5Alloy
With LaNi
3, Ni, Mg, Co powder press La
0.7Mg
0.3Ni
2.5Co
0.5The required chemical dose of alloy takes by weighing, mixing, the SPS mould of then powder being packed into carries out die mould, carry out discharge plasma sintering more in a vacuum, the sintering process system is: rate of heating is 100 ℃/min, sintering temperature is 540 ℃, 600 ℃, 700 ℃, 750 ℃, 800 ℃, 850 ℃, pressurization 20MPa, soaking time 10min, stove is cold then, is cooled to room temperature.Its experimental result is as follows:
Table 1
| Alloy | Temperature (℃) | The activation number of times | Maximum discharge capacity (mAh/g) |
| La 0.7Mg 0.3Ni 2.5Co 0.5 | 540 | 1 | 168.5 |
| 600 | 1 | 169.1 | |
| 700 | 1 | 194.2 | |
| 750 | 1 | 349.8 | |
| 800 | 1 | 360.0 | |
| 850 | 1 | 356.5 |
Claims (1)
1. one kind prepares the method for hydrogen storage alloy with discharge plasma sintering technique, it is characterized in that:
Preparation process is:
With LaNi
3, Ni, Mg, Co powder press hydrogen storage alloy La
xMg
1-xNi
yCo
zIn the proportion ingredient of each element, mixing carries out die mould in the graphite jig of packing into then; Carry out discharge plasma sintering more in a vacuum, the sintering process system is: rate of heating is 50-150 ℃/min, and sintering temperature is 300 ℃-1000 ℃, pressurization 5-30MPa, and soaking time 3-15min cools to room temperature then with the furnace; 0.6≤x≤0.7,2.5≤y≤2.8,0.4≤z≤0.6 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101130722A CN100415910C (en) | 2006-09-08 | 2006-09-08 | Method of producing hydrogen-storage alloy by discharge plasma sintering technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101130722A CN100415910C (en) | 2006-09-08 | 2006-09-08 | Method of producing hydrogen-storage alloy by discharge plasma sintering technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1920076A true CN1920076A (en) | 2007-02-28 |
| CN100415910C CN100415910C (en) | 2008-09-03 |
Family
ID=37777923
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101130722A Expired - Fee Related CN100415910C (en) | 2006-09-08 | 2006-09-08 | Method of producing hydrogen-storage alloy by discharge plasma sintering technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307405B (en) * | 2008-07-04 | 2010-04-14 | 北京科技大学 | Magnesium vanadium composite hydrogen occluding alloy |
| CN102586651A (en) * | 2012-03-05 | 2012-07-18 | 华中科技大学 | Preparation method of hydrogen storage alloy material |
| CN103192203A (en) * | 2013-01-10 | 2013-07-10 | 昆明贵千新型材料技术研究有限公司 | Process method for preparing silver solder |
| TWI554352B (en) * | 2011-03-02 | 2016-10-21 | Takako Ind Inc | A method of manufacturing a sliding member |
| CN110280770A (en) * | 2019-08-12 | 2019-09-27 | 哈尔滨工业大学 | A kind of method of discharge plasma sintering recycling light-alloy processing bit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4828714B2 (en) * | 2001-04-03 | 2011-11-30 | 株式会社三徳 | Hydrogen storage alloy, method for producing the same, and negative electrode for nickel metal hydride secondary battery |
| CN1416987A (en) * | 2002-12-19 | 2003-05-14 | 北京工业大学 | Discharge and plasma fast sintering process of preparing secondary composite RE-MO emitting material |
| CN1272460C (en) * | 2003-10-10 | 2006-08-30 | 桂林电子工业学院 | RE-Mg-Ni series three-element or more system hydrogen-storage alloy and amorphous preparing method thereof |
| CN1314823C (en) * | 2005-02-02 | 2007-05-09 | 华南理工大学 | REMg3 type hydrogen storage alloy and its preparation method |
-
2006
- 2006-09-08 CN CNB2006101130722A patent/CN100415910C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307405B (en) * | 2008-07-04 | 2010-04-14 | 北京科技大学 | Magnesium vanadium composite hydrogen occluding alloy |
| TWI554352B (en) * | 2011-03-02 | 2016-10-21 | Takako Ind Inc | A method of manufacturing a sliding member |
| CN102586651A (en) * | 2012-03-05 | 2012-07-18 | 华中科技大学 | Preparation method of hydrogen storage alloy material |
| CN103192203A (en) * | 2013-01-10 | 2013-07-10 | 昆明贵千新型材料技术研究有限公司 | Process method for preparing silver solder |
| CN103192203B (en) * | 2013-01-10 | 2015-06-17 | 昆明贵千新型材料技术研究有限公司 | Process method for preparing silver solder |
| CN110280770A (en) * | 2019-08-12 | 2019-09-27 | 哈尔滨工业大学 | A kind of method of discharge plasma sintering recycling light-alloy processing bit |
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| Publication number | Publication date |
|---|---|
| CN100415910C (en) | 2008-09-03 |
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