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Sintering process of lanthanum cerium-containing sintered NdFeB

A neodymium-iron-boron and lanthanum-cerium technology, which is applied in the field of iron-boron magnet material preparation, can solve the problems of magnetic performance influence, magnet composition deviation, iron-boron grain growth, etc., so as to save electricity costs, shorten the sintering time period, and save water and electricity. The effect of consumption

Inactive Publication Date: 2019-10-11
宁波合盛磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The precipitation of rare earth content will cause the deviation of the magnet composition, which will have a certain impact on the magnetic performance. In addition, the transitional flow of the neodymium-rich phase liquid phase will easily cause the growth of lanthanum-containing sintered NdFeB grains.

Method used

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  • Sintering process of lanthanum cerium-containing sintered NdFeB
  • Sintering process of lanthanum cerium-containing sintered NdFeB
  • Sintering process of lanthanum cerium-containing sintered NdFeB

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Effect test

Embodiment 1

[0027] The formula of raw embryo (brand N35) is in the present embodiment:

[0028] N35 PrN Gd LaCe B Cu Al co Zr Fe and unavoidable impurities Proportion 15％ 2％ 15％ 1％ 0.10％ 0.80％ 0.80％ 0.30％ margin

[0029] The flow chart of the sintering stage of the green embryo is as follows: figure 2 As shown, the specific sintering process is: the vacuum sintering furnace is vacuumed to 3.0*10 -2 Pa, heat up to 650°C in 2.5h, heat up to 890°C for 2.5h→0.8h, heat up to 1033°C for 2.5h→1h, heat up for 5h→1.5h, cool to below 70°C→1.5h, heat up to 560°C, hold for 5h → 2.5h to cool to room temperature to obtain a blank.

[0030] The magnetic properties of the blanks obtained are shown in Table 1.

Embodiment 2

[0032] The green embryo formula in the present embodiment is the same as embodiment 1, and the green embryo sintering process is as follows figure 2 As shown, the specific sintering process is: the vacuum sintering furnace is vacuumed to 3.0*10 -2 Pa, heat up to 600°C in 2 hours, keep warm for 2h→0.5h and heat up to 850°C, keep warm for 2h→0.8h and heat up to 1000°C, keep warm for 4h→cool to below 70°C within 1h→1h heat up to 500°C, keep warm for 4h→2h cooling To normal temperature, get blank.

[0033] The magnetic properties of the blanks obtained are shown in Table 1.

Embodiment 3

[0035] The green embryo formula in the present embodiment is the same as embodiment 1, and the green embryo sintering process is as follows figure 2 As shown, the specific sintering process is: the vacuum sintering furnace is vacuumed to 3.0*10 -2 Pa, heat up to 700°C in 3h, keep warm for 3h→0.8h and heat up to 900°C, keep warm for 3h→1h and heat up to 1100°C, keep warm for 4.5h→cool to below 70°C within 2h→2h heat up to 700°C, keep warm for 6h→3h cooling To normal temperature, get blank.

[0036] The magnetic properties of the blanks obtained are shown in Table 1.

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Abstract

The invention discloses a sintering process of a lanthanum cerium-containing sintered NdFeB. The sintering process comprises the following steps of (1) performing deflation dehydrogenation, in which ablank is sent into a vacuum sintering furnace, a temperature is raised to 600-700 DEG C, and heat preservation is performed; (2) performing secondary deflation, in which the temperature is raised to850-900 DEG C, and heat preservation is performed; (3) performing high-temperature compactness, in which the temperature is raised to 1,000-1,100 DEG C, and heat preservation is performed; and (4) performing one-step aging and tempering, in which cooling is performed to 70 DEG C or below, the temperature is raised to 500-700 DEG C, cooling is performed to a room temperature after heat preservation, and a blank product is obtained. The sintering process of the lanthanum cerium-containing sintered NdFeB is optimized and transformed, the one-step aging process is taken, the aging temperature eachstage is determined, the sintering period is greatly reduced (the reduction period is 10 hours or above), water and power consumption is saved, the power charge is reduced by approximate one third, meanwhile, the utilization rate of sintering equipment is doubled, and no influenced is generated on the magnetic performance of the product.

Description

technical field [0001] The invention relates to the technical field of preparation of iron-boron magnet materials, in particular to a sintered NdFeB sintering process containing lanthanum and cerium. Background technique [0002] Neodymium iron boron (NdFeB) is currently the most magnetic rare earth permanent magnet material, it has a high magnetic energy product (8MGOe-64MGOe), good coercive force (Hcj) and high temperature resistance. The application fields and volume of NdFeB permanent magnet materials are increasing day by day, and the annual market demand is increasing by nearly 20%. Therefore, the price of NdPr alloy is getting higher and higher, and the supply is very tight. However, although lanthanum and cerium, which are rare earth metals, have large reserves, they are not very useful, so the price of lanthanum and cerium is much cheaper than that of praseodymium and neodymium. [0003] Considering that the price of lanthanum cerium alloy is much cheaper than pras...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0577H01F41/0293
Inventor 罗立伟
Owner 宁波合盛磁业有限公司
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