A method for preparing high-purity manganese-bismuth (MNBI) alloy

A pure manganese-bismuth alloy technology, applied in the field of magnetic functional materials, can solve the problems of restricting the application of MnBi alloy materials, difficulty in synthesis of MnBi alloy materials, low magnetic properties of alloy materials, etc., and achieve high melting point, improved purity, and high thermal conductivity. Effect

Active Publication Date: 2017-10-31
JILIN NORMAL UNIV
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Problems solved by technology

However, during the preparation process, due to the Bi 3+ It is extremely volatile at high temperature, and Mn is easy to precipitate from the liquid phase in the peritectic reaction, which makes it difficult to synthesize high-purity MnBi alloy materials, resulting in low magnetic properties of alloy materials, and most of the above-mentioned traditional methods are complicated in process and high in cost. , these have seriously restricted the application of MnBi alloy materials

Method used

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  • A method for preparing high-purity manganese-bismuth (MNBI) alloy
  • A method for preparing high-purity manganese-bismuth (MNBI) alloy
  • A method for preparing high-purity manganese-bismuth (MNBI) alloy

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preparation example Construction

[0019] The preparation method of high-purity MnBi alloy comprises the following steps:

[0020] 1. Select Bi and Mn powders as raw materials, and the Bi and Mn are 99%-99.999% nano or micron powders.

[0021] ②. Proportion the Bi and Mn powders selected in the above ① according to the molar ratio 1:x (x=1.0-2.0), mix them uniformly and package them in molybdenum cups, and carry out low-pressure pretreatment on the molybdenum cup samples through a powder molding press. Treatment or ultra-high pressure pretreatment of molybdenum cup samples by domestic six-sided top hydraulic press, the pressure range of low pressure pretreatment is 2-40MPa, and the pressure range of high pressure pretreatment is 1-6 GPa.

[0022] ③. Put the molybdenum cup cavity pre-pressed in ② into the crucible, and complete the preparation of MnBi alloy through closed low-temperature sintering and quenching procedures, and prepare high-purity MnBi alloy (95 at.%). Closed low-temperature sintering is to synt...

Embodiment 1

[0024] as attached figure 1 Shown: Select 3.0g of Bi and Mn mixed powder (average particle size 3-5 μm, molar ratio 1:1) as raw material, such as figure 1 Shown in number 1. Put the mixed powder into the molybdenum cup cavity of outer cup Φ13.65×5 mm and inner cup Φ13.38×5 mm, such as figure 1 Shown in number 2. The low-pressure pre-compression sealing treatment was carried out on the powder molding press, and the pressure condition was 2 MPa to obtain a dense Bi-Mn sample block sealed by a Φ 14×3.2 mm molybdenum cup.

[0025] as attached image 3 Shown: Put the sealed molybdenum cup sample block into a ceramic crucible with a volume of about 40ml, such as image 3 Shown in number 7. Place the molybdenum cup closed cavity (after pre-pressing) 8 and the large-aperture metal mesh 9 from top to bottom, and perform low-temperature heat treatment in a muffle furnace with a sintering temperature of 270 °C and a holding time of 50 h. After cooling, a Φ 13.5×3 mm high-purity MnB...

Embodiment 2

[0027] as attached figure 1 Shown: Select 3.0g of Bi and Mn mixed powder (average particle size 3-5 μm, molar ratio 1:1.3) as raw material, such as figure 1 Shown in number 1. Put the mixed powder into the molybdenum cup cavity of the outer cup Φ13.65×5 mm and the inner cup Φ13.38×5mm, such as figure 1 Shown in number 2. The low-pressure pre-compression sealing treatment was carried out on the powder molding press, and the pressure condition was 15 MPa to obtain a dense Bi-Mn sample block sealed by a Φ 14×3.2 mm molybdenum cup.

[0028] as attached image 3 Shown: Put the sealed molybdenum cup sample block into a ceramic crucible with a volume of about 40ml, such as image 3 Shown in number 7. According to the sequence of molybdenum cup closed cavity (after pre-pressing) 8 and large-aperture metal mesh 9 from top to bottom, low-temperature heat treatment is carried out in the muffle furnace, the sintering temperature is 280 °C, the holding time is 20 h, quenching After c...

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Abstract

The invention belongs to a method for preparing a high-purity MnBi alloy. The method is simple in process and comprises following steps: firstly, Bi powder and Mn powder are selected to serve as raw materials; secondly, the Bi powder and the Mn powder selected in the first step are evenly mixed according to a certain proportion and then are packaged in a molybdenum cup, and a molybdenum cup sample is subject to low-pressure pretreatment through a powder forming press or subject to ultrahigh-pressure pretreatment through a domestic six-side top liquid pressing machine; and thirdly, a molybdenum cup cavity obtained after being subject to prepressing treatment in the second step is placed in a crucible, and preparing of the MnBi alloy is completed through a low-temperature sintering and quenching program. The molybdenum cup is adopted to serve as the closed type cavity to be subject to low-temperature sintering, high-temperature volatilization of Bi3+ is effectively restrained, generation of Bi and Mn oxides is prevented, and purity of the MnBi alloy is improved; and the molybdenum cup has the high melting point, the higher oxidization temperature and high heat conductivity, and in the sintering process and the quenching process, the alloy is an excellent shielding material and an excellent heat conduction material.

Description

technical field [0001] The invention belongs to the field of magnetic functional material research, and specifically relates to a method for preparing a manganese-bismuth (MnBi) alloy with low cost, simple process, high purity and strong operability. Background technique [0002] The low-temperature phase of the MnBi alloy has a NiAs crystal structure, which has strong ferromagnetism and high magnetocrystalline anisotropy at room temperature. At the same time, the MnBi phase has a significant magneto-optical effect, which can be used as a magneto-optical storage material, and has attracted extensive attention from magnetic researchers at home and abroad. [0003] At present, the preparation methods of MnBi alloy mainly include magnetic levitation melting method, sputtering method, arc melting method, epitaxial growth method, induction melting method and mechanical alloying, etc. Yoshida et al. About 90wt.% MnBi single phase. J. B. Yang et al. used high-temperature sinterin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/02B22F3/10C22C22/00
CPCB22F3/02B22F3/10C22C1/04C22C22/00
Inventor 李海波贾洪声鄂元龙鲁铭
Owner JILIN NORMAL UNIV
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