Preparation method of rare earth alloy spherical single crystal magnetic powder and (111) oriented rare earth giant magnetostrictive material

A technology of giant magnetostriction and rare earth alloys, which is applied in the direction of magnetic materials, polycrystalline material growth, inductor/transformer/magnet manufacturing, etc., can solve the problems of reducing the size of magnetostriction and energy conversion efficiency, and achieve good orientation, single The effect of high crystallinity and simple process method

Inactive Publication Date: 2020-06-23
NANJING UNIV
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reducing the ratio of magnetic particles will affect the transfer of strain between magne

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of rare earth alloy spherical single crystal magnetic powder and (111) oriented rare earth giant magnetostrictive material
  • Preparation method of rare earth alloy spherical single crystal magnetic powder and (111) oriented rare earth giant magnetostrictive material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] Preparation of Tb-Fe Alloy Cubic Laves Phase Spherical Single Crystal Magnetic Powder

[0033] Obtain TbFe by smelting method 1.95 The alloy (subscript is atomic ratio), mechanically crushed to obtain powder with a size of about 20μm-100μm as a raw material. Take 50 grams of TbFe 1.95 Alloy powder and Ca with a size of about 5μm 6 Al 2 O 9 The powder is in a ratio of 1:3 by weight, and mixed evenly after mechanical stirring.

[0034] The mixed TbFe 1.95 Alloy / Ca 6 Al 2 O 9 Put the powder into the annealing furnace and vacuum to 1×10 -3 Pa, blow argon to 0.06MPa, and heat the annealing furnace to 1240°C at 20° / min (higher than TbFe 1.95 Alloy melting point temperature), after holding for 10 minutes, the temperature is quickly reduced to 950°C, and after holding for 2 hours, it is cooled to room temperature with the furnace.

[0035] Soak TbFe with alcohol 1.95 Alloy / Ca 6 Al 2 O 9 Mix powder and get TbFe by ultrasonic cleaning 1.95 Alloy magnetic powder. TbFe ...

Example Embodiment

[0036] Example 2

[0037] Preparation of Sm-Fe alloy cubic Laves phase spherical single crystal magnetic powder, SmFe is prepared by atomization method 1.85 For alloy powder (subscript is atomic ratio), powder with a size of 50μm-100μm is selected as the raw material. Take 100 grams of SmFe 1.85 The alloy powder and the CaO powder with a size of about 2μm are in a ratio of 1:2 by weight, and mixed uniformly after mechanical stirring.

[0038] The mixed SmFe 1.85 The alloy / CaO powder is put into the annealing furnace and evacuated to 1×10 -3 Pa, blow argon to 0.1MPa, heat the annealing furnace to 860°C at 20° / min, keep it for 4 hours and then cool it down to room temperature.

[0039] Soak SmFe in alcohol 1.85 Alloy / CaO mixed powder, SmFe is obtained by ultrasonic cleaning 1.85 Alloy magnetic powder. Scanning electron microscopy shows that the particles are spherical in size ranging from 50 μm to 100 μm. XRD results confirmed SmFe 1.85 The crystal structure of the alloy is cubic lav...

Example Embodiment

[0040] Example 3

[0041] Tb 0.35 Dy 0.65 Fe 1.9 Preparation and Preparation of Alloy Cubic Laves Phase Spherical Single Crystal Magnetic Powder Oriented magnetostrictive material, obtain Tb by melting method 0.35 Dy 0.65 Fe 1.9 The alloy (subscript is atomic ratio), mechanically crushed to obtain powder with a size of about 20μm to 200μm as a raw material. Take 200 grams of Tb 0.35 Dy 0.65 Fe 1.9 The alloy powder and the CaO powder with a size of about 2μm are in a ratio of 1:3 by weight, and mixed evenly by mechanical stirring.

[0042] The mixed Tb 0.35 Dy 0.65 Fe 1.9 The alloy / CaO powder is put into the annealing furnace and evacuated to 1×10 -3 Pa, blow argon to 0.06MPa, heat the annealing furnace to 1290°C at 20° / min (higher than Tb 0.35 Dy 0.65 Fe 1.9 Alloy melting point temperature), after holding for 10 minutes, the temperature is quickly reduced to 1100°C, and after holding for 2 hours, it is cooled to room temperature with the furnace.

[0043] Soak Tb with alcohol 0.35 D...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Sizeaaaaaaaaaa
Sizeaaaaaaaaaa
Sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of (111) oriented rare earth giant magnetostrictive material and alloy spherical single crystal magnetic powder. The preparation method comprises the following steps: 1) preparing R-Fe-M alloy spherical magnetic powder; 2) uniformly mixing the R-Fe-M alloy spherical magnetic powder with an inert solid dispersing agent, and annealing at a temperature below the melting point of the R-Fe-M alloy to obtain R-Fe-M cubic Laves phase single crystal particles, the annealing temperature being within the range of 50-200 DEG C below the melting point of the cubic Laves phase, preferably the annealing time being 1-4 hours; and 3) removing the solid dispersing agent to obtain the R-Fe-M cubic Laves phase spherical single crystal magnetic powder. The R-Fe-M alloy spherical magnetic powder is separated by an inert solid dispersing agent, and spherical single crystal particles are prepared through the abnormal growth capacity of R-Fe-M cubic Laves phase crystal particles at high temperature. The bonded rare earth giant magnetostrictive material with high (111) orientation and the sintered rare earth giant magnetostrictive material are prepared.

Description

technical field [0001] The present invention relates to the preparation method of rare earth giant magnetostrictive material and spherical single crystal magnetic powder suitable for <111> orientation, especially R-Fe-M alloy in the field of bonded rare earth giant magnetostrictive material and sintered rare earth giant magnetostrictive material The preparation method of spherical single crystal magnetic powder. Background technique [0002] Rare earth-iron cubic Laves phase single crystal materials exhibit a large magnetostrictive effect, and have important applications in sonar, transducers and other fields. However, the preparation process of rare earth-iron cubic Laves phase single crystal materials is complicated, and the production cost is high, so it is difficult to prepare single crystal materials with large size and uniform composition and properties. As an alternative method, the rare earth-iron cubic Laves phase single crystal powder can be prepared, and th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01F1/055H01F41/02C30B1/02C30B29/52
CPCC30B1/02C30B29/52H01F1/0557H01F1/0558H01F41/0253H01F41/0266
Inventor 唐少龙董大舜钱进黄业都有为
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products