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A sintered NdFeB permanent magnet material containing cerium and holmium

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of increased consumption, higher prices, increased cost of sintered NdFeB permanent magnet materials, etc. The effect of tenacity, material cost reduction, and market competitiveness improvement

Active Publication Date: 2018-08-14
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, due to the rapid development of the sintered NdFeB industry, the consumption of commonly used rare earth materials such as praseodymium neodymium (or neodymium), dysprosium iron (or dysprosium), and terbium has increased, resulting in a continuous rise in its price, prompting the sintered NdFeB permanent magnet Increased cost of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Materials such as praseodymium neodymium, cerium, holmium iron, iron, cobalt, copper, aluminum, ferroniobium and ferroboron are divided into components ((PrNd) 0.69 Ce 0.3 Ho 0.01 ) 32 (FeCoCuAlNb) 67.02 B 0.98 Batching 300kg, wherein cerium is 28.8kg, holmium iron (containing holmium 80%) is 1.2kg. Put the raw materials (298.8kg) except holmium iron into the smelting furnace, and when the vacuum degree in the smelting furnace reaches below 5Pa, increase the power for smelting, and pour into strips. Put the strip flakes into a hydrogen crushing furnace, vacuumize, fill with hydrogen and crush them, and dehydrogenate at 580°C to get the flakes in the flakes. Put 50kg of holmium iron into the hydrogen crushing furnace, vacuumize it, fill it with hydrogen and crush it, and dehydrogenate it at 520°C to get holmium iron medium powder. Weigh 1.2kg of holmium-iron medium powder, put it into the jet mill equipment together with 298.8kg of flake medium powder for powder mi...

Embodiment 2

[0023] Materials such as praseodymium neodymium, cerium, holmium iron, iron, cobalt, copper, aluminum, ferroniobium and ferroboron are divided into components ((PrNd) 0.72 Ce 0.22 Ho 0.06 ) 32 (FeCoCuAlNb) 67.05 B 0.95 The ingredients are 300kg, including 21.12kg of cerium and 7.2kg of holmium iron (containing 80% holmium). Put the raw materials (292.8kg) except holmium iron into the smelting furnace, and when the vacuum degree in the smelting furnace reaches below 5Pa, increase the power for smelting, and cast into strips. Put the strip flakes into a hydrogen crushing furnace, vacuumize, fill with hydrogen and crush them, and dehydrogenate at 580°C to get the flakes in the flakes. Put 50kg of holmium iron into the hydrogen crushing furnace, vacuumize it, fill it with hydrogen and crush it, and dehydrogenate it at 560°C to get holmium iron medium powder. Weigh 7.2kg of holmium-iron medium powder, and add 292.8kg of flake powder into the jet mill equipment for powder mill...

Embodiment 3

[0025] Materials such as praseodymium neodymium, cerium, holmium iron, iron, cobalt, copper, aluminum, ferroniobium and ferroboron are divided into components ((PrNd) 0.76 Ce 0.05 Ho 0.2 ) 30 (FeCoCuAlNb) 68.95 B 1.05 Batching 300kg, wherein cerium is 4.5kg, holmium iron (containing holmium 80%) is 22.5kg. Put the raw materials (277.5kg) except holmium iron into the smelting furnace, and when the vacuum degree in the smelting furnace reaches below 5Pa, increase the power to smelt, and pour into strips. Put the strip flakes into a hydrogen crushing furnace, vacuumize, fill with hydrogen and crush them, and dehydrogenate at 580°C to get the flakes in the flakes. Put 50kg of holmium iron into the hydrogen crushing furnace, vacuumize it, fill it with hydrogen and crush it, and dehydrogenate it at 520°C to get holmium iron medium powder. Weigh 22.5kg of holmium-iron medium powder, and add 298.8kg of flake medium powder into the jet mill equipment for powder milling to obtain ...

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Abstract

The invention discloses a cerium-holmium contained sintered neodymium iron boron permanent magnet material. The neodymium iron boron permanent magnet material comprises the following ingredients: ((PrNd)1-x-y CexHoy)a(FeCoCuAlNb)100-a-bBb, wherein a is equal to 30-33; b is equal to 0.95-1.05; x is equal to 0.05-0.30, and y is less than or equal to 0.20. The preparation method for the permanent magnet material comprises the following steps: (1) dosing and smelting; (2) performing hydrogen decrepitation; (3) mixing and preparing powder; (4) performing orientation and moulding; and (5) sintering and annealing, wherein the holmium is added in the working procedure of the mixing and preparing powder in a hydrogen decrepitation holmium iron mode. The low-cost cerium and holmium are added to replace high-cost praseodymium neodymium and dysprosium, so that the problem of the relatively high cost of the permanent magnet material caused by the high-cost praseodymium neodymium and dysprosium at current is solved, and the cost of the sintered neodymium iron boron permanent magnet material is lowered.

Description

technical field [0001] The invention relates to a sintered NdFeB permanent magnet material containing cerium and holmium and a preparation method thereof. Background technique [0002] In recent years, due to the rapid development of the sintered NdFeB industry, the consumption of commonly used rare earth materials such as praseodymium neodymium (or neodymium), dysprosium iron (or dysprosium), and terbium has increased, resulting in a continuous rise in its price, prompting the sintered NdFeB permanent magnet The cost of materials increases. At present, the price of praseodymium and neodymium is 300,000-400,000 yuan / ton, that of dysprosium and iron is 1.3-1.5 million yuan / ton, and that of terbium is 2.4-2.6 million yuan / ton. The price of cerium with abundant reserves is 30,000 to 40,000 yuan / ton, and the price of holmium iron is 260,000 to 280,000 yuan / ton. It can be seen that the price of cerium is only one tenth of that of praseodymium and neodymium, and holmium is much ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16
Inventor 谭春林罗明王涛肖磊
Owner HUNAN AEROSPACE MAGNET & MAGNETO