Preparation method of RE-Fe-B part hydrogen storage alloy

A technology for hydrogen storage alloys and alloys, applied in the field of hydrogen storage materials, can solve problems such as no raw materials involved in alloy preparation, no specific requirements for preparation processes, etc., and achieve good charge/discharge or hydrogen absorption/desorption cycle stability, excellent Effect of gas phase hydrogen absorption/desorption reversibility and small hydrogen absorption/desorption expansion rate

Inactive Publication Date: 2010-01-27
NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not involve the raw materials for alloy preparation, nor does it propose specific requirements for the preparation process

Method used

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  • Preparation method of RE-Fe-B part hydrogen storage alloy
  • Preparation method of RE-Fe-B part hydrogen storage alloy
  • Preparation method of RE-Fe-B part hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The prepared alloy composition is RE 19 (FeNiMn) 68 (BMnAl) 68 、RE 17 (FeNiMn) 76 (BMnAl) 7 、RE 15 (FeNiMn) 77 (BMnAl) 8 、RE 15 (FeNiMnCu) 77 (BMnAl) 8 、RE 15 (FeNiMnCu) 77 (BMnAlSi) 8 、RE 8 (FeNiMn) 86 (BMnAl) 6 、RE 8 (FeNiMn) 27 (BMnAl) 24 、RE 8 (FeNiMn) 28 (BMnAl) 24 、RE 5 (FeNiMn) 18 (BMnAl) 18 、RE 5 (FeNiMn) 2 (BMnAl) 6 、RE 2 (FeNiMn) 23 (BMnAl) 3 、RE 2 (FeNiMn)(BMnAl)3 、RE 2 (FeNiMn) 14 (BMnAl). According to the stoichiometric ratio of the prepared alloy, RE-Fe alloy, RE-Fe-B alloy, LaNi 5 type alloy, B-Fe alloy, B-Ni alloy as raw materials, and other elements in the alloy composition RE, Fe, Ni, Mn, Cu, Mn, Al, Si as raw materials for balance components, considering the La, Smelting and burning loss of Mn and Al elements. Various raw materials (purity greater than 99.0%) were calculated and weighed. The raw materials were made into RE-Fe-B alloy flakes under the protection of Ar gas by medium frequency induction melting-quick ...

Embodiment 2

[0028] The prepared alloy composition is RE 15 (FeNiMn) 77 (BMnAl) 8 . According to RE 15 (FeNiMn) 77 (BMnAl) 8 The stoichiometric ratio of the alloy is calculated and weighed by using elemental metal La, metal Ni, metal Mn, metal Al, and La-Fe, B-Fe alloys as raw materials, and considering the melting and burning loss of La, Mn, and Al elements. The amount of various raw materials (purity greater than 99.0%). The smelting preparation process, heat treatment method, powder making method and performance testing method are the same as in Example 1. The test results are shown in Table 2.

[0029] Table 2RE 15 (FeNiMn) 77 (BMnAl) 8 Properties of Hydrogen Storage Alloys

[0030]

Embodiment 3

[0032] The prepared alloy composition and raw materials are the same as in Example 2. The high-temperature melting and casting method, the high-temperature melting-gas atomization method and the powder sintering method are respectively used for preparation. The preparation process is carried out under the protection of Ar gas, and the heat treatment method, powder making method and performance testing method are the same as in Example 1. The test results are shown in Table 3.

[0033] Table 3RE 15 (FeNiMn) 77 (BMnAl) 8 Performance Comparison of Different Preparation Methods of Hydrogen Storage Alloys

[0034]

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Abstract

The invention relates to a preparation method of an RE-Fe-B part hydrogen storage alloy, which is characterized by comprising the following materials: RE contained in the RE-Fe-B part hydrogen storage alloy, a replaced element of the RE, B, a replaced element of the B, an RE-Fe alloy, a B-Fe alloy, a B-Ni alloy, an RE-Fe-B alloy, a LaNi5 type alloy and other preliminary alloys containing composition elements, wherein two or more materials are selected to be prepared according to a chemical composition formula of the RE-Fe-B part hydrogen storage alloy; one of a high-temperature smelting casting method, a high-temperature smelting-quick-quenching method, a high-temperature smelting-gas atomization method and a powder sintering method or a mechanical alloying method is adopted to manufacture the RE-Fe-B part hydrogen storage alloy; and the preparation process needs to be carried out under the protection of inert gas or a vacuum environment. The RE-Fe-B part hydrogen storage alloy is in a multiphase structure and comprises a LaNi5 phase, a La3Ni13B2 phase, a rich Fe or rich Ni phase, and the like. The prepared RE-Fe-B part hydrogen storage alloy has good activation property due to the special composition and structure, large current discharge capability, low-temperature electrochemistry property and charge / discharge or hydriding / dehydriding circulating stability, the maximum discharge capacity of the RE-Fe-B part hydrogen storage alloy can reach 400mAh.g<-1>, and the cost of the RE-Fe-B part hydrogen storage alloy is lower than that of other known hydrogen storage alloys; and in addition, the prepared RE-Fe-B part hydrogen storage alloy is used for battery negative pole materials, gaseous phase hydrogen storage materials and heat pump materials.

Description

Technical field: [0001] The invention relates to a preparation method of a RE-Fe-B series hydrogen storage alloy, belonging to the field of hydrogen storage materials. Background technique: [0002] In the early 1990s, high-performance, pollution-free LaNi 5 Type hydrogen storage alloy replaces the toxic cadmium negative electrode in cadmium-nickel (Cd / Ni) batteries, and develops an environmentally friendly metal hydride-nickel (MH / Ni) secondary battery, which occupies part of the application market of Cd / Ni batteries. But due to commodity LaNi 5 The high-value metal element Co contained in the type alloy has a high cost, so that the MH / Ni battery cannot completely replace the Cd / Ni battery. [0003] China is the manufacturing center and largest exporter of Cd / Ni batteries in the world. In 2004, the total output of Cd / Ni batteries reached 2 billion pieces. In recent years, the production and sales of Cd / Ni batteries are equivalent to that of MH / Ni batteries. Hundreds of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/04C22C33/04C22C33/06C22C33/02C22F1/00B22F9/04
Inventor 闫慧忠孔繁清熊玮李金李宝犬
Owner NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS
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