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A kind of antioxidant for NdFeB alloy powder making

An anti-oxidant, NdFeB technology, applied in the direction of magnetic materials, inorganic material magnetism, electrical components, etc., can solve the problems of weakened isolation effect of NdFeB powder, three-dimensional scale defects of products, and lower yield rate, etc., to achieve three-dimensional scale defects The probability of reducing, reducing particle agglomeration, and improving the effect of yield

Inactive Publication Date: 2015-12-02
宿州学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above components are used as powder antioxidants. Since the boiling point of the added substance is too low, evaporation occurs under the action of high temperature (over 100°C) generated during powder ball milling or jet milling, making the NdFeB powder between The isolation effect is weakened; at the same time, since its boiling point is around 200°C, a large amount of dense gas will be emitted in this temperature region during the molding and sintering stage of NdFeB powder, which will cause three-dimensional scale defects inside the sintered product, which directly leads to product scrapping. thus reducing the yield

Method used

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  • A kind of antioxidant for NdFeB alloy powder making
  • A kind of antioxidant for NdFeB alloy powder making
  • A kind of antioxidant for NdFeB alloy powder making

Examples

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Effect test

Embodiment 1

[0022] An antioxidant for NdFeB ball milling, which is characterized in that: NdFeB N45 cast pieces are used for hydrogen crushing, the obtained coarse powder is put into a three-dimensional ball mill tank, and the weight of the coarse powder is 0.5wt in one addition % NdFeB powder-making antioxidant, after mixing and ball milling for 5 hours; then adding 0.8wt% antioxidant accounting for the weight of the coarse powder for a second time, and jet milling for 2 hours to obtain a fine powder. The composition of the above-mentioned NdFeB antioxidant is as follows: the dispersant adopts thymol (C 10 h 14 O) and calcium stearate (C) with a boiling point of 359.4°C 36 h 70 o 4 Ca) mixing; binder adopts the polyethylene glycol that boiling point is 197.3 ℃; Solvent adopts the octane (C that boiling point is 125.8 ℃ 8 h 18 ); the lubricant uses aviation kerosene with a high boiling point; the antistatic additive uses Stadis 450 with a boiling point of 90°C. The proportions of th...

Embodiment 2

[0027] An antioxidant for NdFeB ball milling, characterized in that: NdFeB 48M cast pieces are used for hydrogen crushing, the obtained coarse powder is put into a three-dimensional ball mill tank, and the weight of the coarse powder is 0.9wt in one addition % NdFeB powder-making antioxidant, after mixing and ball milling for 5 hours; then adding 0.6wt% antioxidant accounting for the weight of the coarse powder for a second time, and jet milling for 2 hours to obtain a fine powder. The composition of the above-mentioned NdFeB antioxidant is as follows: the dispersant adopts thymol (C 10 h 14 O) and calcium stearate (C) with a boiling point of 359.4°C 36 h 70 o 4 Ca) mixing; binder adopts the polyethylene glycol that boiling point is 197.3 ℃; Solvent adopts the octane (C that boiling point is 125.8 ℃ 8 h 18 ); the lubricant uses aviation kerosene with a high boiling point; the antistatic additive uses Stadis 450 with a boiling point of 90°C. The proportions of the compone...

Embodiment 3

[0032] An antioxidant for NdFeB ball milling, characterized in that: NdFeB 40SH cast pieces are used for hydrogen crushing, and the obtained coarse powder is put into a three-dimensional ball mill tank, and the weight of the coarse powder is 10wt% in one addition The anti-oxidant used for making NdFeB powder was mixed and ball-milled for 5 hours; then 1.6 wt% of the antioxidant was added to the coarse powder for a second time, and the fine powder was obtained through jet milling for 2 hours. The composition of the above-mentioned NdFeB antioxidant is as follows: the dispersant adopts thymol (C 10 h 14 O) and calcium stearate (C) with a boiling point of 359.4°C 36 h 70 o 4 Ca) mixing; binder adopts the polyethylene glycol that boiling point is 197.3 ℃; Solvent adopts the octane (C that boiling point is 125.8 ℃ 8 h 18 ); the lubricant uses aviation kerosene with a high boiling point; the antistatic additive uses Stadis 450 with a boiling point of 90°C. The proportions of t...

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Abstract

The invention relates to an antioxidant for milling a neodymium-iron-boron alloy. For the first time, the antioxidant for milling the neodymium-iron-boron alloy accounting for 0.01-10wt% of the weight of the coarse powder is added, and for the second time, the antioxidant accounting for 0.01-10wt% of the weight of the coarse powder is added, wherein the antioxidant is composed of such components as 5-35wt% of thymol (C10H14O), 1-50wt% of calcium stearate (C36H70O4Ca), 5-35wt% of polyethylene glycol octane (C8H18), 5-35wt% of high-boiling point aviation kerosene and 5-35wt% of Stadis450. The antioxidant for milling neodymium-iron-boron alloy has the beneficial effects that the components of the antioxidant do not include any corrosive ingredient so that damage to rubber elements in a ball mill or an air-current mill can be avoided, in the molding sintering process, the components are easy to volatize and disperse and the additives are diversified, and therefore, the formation of lots of bubbles generated at one single temperature point can be prevented, the degradation of the mechanical strength of the product due to lots of microcracks appearing inside the neodymium-iron-boron permanent magnet product can be weakened, and the probability of three-dimensional dimension defects are greatly reduced and the rate of finished products is increased.

Description

technical field [0001] The invention belongs to the technical field of NdFeB alloy permanent magnet material preparation, and in particular relates to a powder antioxidant in the NdFeB alloy powder making process. Background technique [0002] At present, the general electronic products in the world are constantly developing towards the trend of miniaturization, light weight, thinning and high requirements for environmental protection and energy saving, which greatly increases the demand for high performance and small volume NdFeB permanent magnet materials. The development and optimization of the preparation process of NdFeB permanent magnet materials can not only meet the needs of daily electronic devices, but also adapt to the future environmental protection and efficient social and economic development model. Therefore, it is important to optimize the production process of NdFeB permanent magnet materials. The significance of it has always been one of the focuses in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04H01F1/057H01F1/06
Inventor 牛晓飞虎号王桂英
Owner 宿州学院
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