Preparation method of micrometer grade NiMnCa magnetic memory alloy grain

A memory alloy, micron-scale technology is applied in the field of preparation of NiMnGa magnetic memory alloy micron-scale particles, which can solve the problems of high power consumption, uneven composition, and many defects of alloy particles, and achieves simple process, uniform composition, and preparation time. short effect

Inactive Publication Date: 2007-08-01
HARBIN ENG UNIV
View PDF0 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there have been reports on NiMnGa particle-reinforced resin intelligent composite materials, all of them are to explain its performance and structure, but there are few reports on the preparation of the key NiMnGa alloy particles.
The article "Magnetocaloric effect in NiMnGa particles produced by spark erosion" published by Y.J.Tang et al. in the United States in the Journal of Applied Physics in 2005 uses spark corrosion to prepare NiMnGa alloy particles, the particle size is less than 100 microns, and the

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 micrometer grade NiMnCa magnetic memory alloy grain
  • Preparation method of micrometer grade NiMnCa magnetic memory alloy grain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] A preparation of micron Ni 52 mn 24 Ga 24 The method for magnetic memory alloy particles, its process route is:

[0009] 1. The master alloy is smelted by vacuum arc method, and the vacuum degree of the back and bottom reaches 10 -3 Pa, then filled with argon to 500Pa;

[0010] 2. Flip and smelt four times, and solidify to obtain a button-shaped ingot;

[0011] 3. Under vacuum, alloy ingots are heat-treated at 800°C, and the holding time is 24 hours;

[0012] 4. The press crushes the master alloy initially to form primary particles with a particle size of 3mm;

[0013] 5. Under the protection of argon, put the original particles into the ball milling tank, put stainless steel balls with a diameter of 18mm, the ball-to-material ratio is 10, add pure acetone, and carry out ball milling. The ball mill speed is 500 rpm, and the ball milling time is 5 hours. secondary alloy particles;

[0014] 6. Under vacuum, the secondary particles after ball milling are annealed at...

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

No PUM Login to view more

Abstract

The invention involves a preparation method of NiMnGa magnetic memory alloy micron-scale particles. The invention uses planetary ball grinder, prepares micron-scale Ni48-55Mn24-30Ga20-25(at.%) magnetic memory alloy particles through controlling size of abrading-ball, ball-material rate, ball grinder rotary speed and ball grinding time and adding proper organic adjuvant, the particle size is controlled less than 100 microns, the particles has complete same phase-change behavior and crystal morphology with body material. The component of prepared NiMnGa magnetic memory alloy micron-scale particles using the invention is uniform, signal martensite phase and iron magnetic properties can be prepared just after short time heat treatment, the art is simple and the preparation time is short. The micron-scale NiMnGa magnetic memory alloy particles can be both raw material for preparing NiMnGa composite and a granular magnetic refrigerating material.

Description

technical field [0001] The invention relates to a method for preparing NiMnGa magnetic memory alloy micron-scale particles. Background technique [0002] NiMnGa magnetic memory alloy is a new type of memory material developed in recent years. It can undergo martensitic twin transformation reorientation or magnetic field-induced martensitic transformation under the action of an external magnetic field to generate large reversible strains, overcoming the Traditional memory alloys have the disadvantages of slow response speed and small reversible strain of electrostrictive and magnetostrictive materials. Studies have shown that NiMnGa single crystal can obtain a magnetically induced strain close to 10%, and the response rate can reach the KHz level. NiMnGa magnetic shape memory alloy is currently the only ferromagnetic Heusler alloy with thermoelastic martensitic phase transition, so that NiMnGa alloy can be used as both temperature sensor and magnetic field sensor. However, ...

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): B22F9/04C22C1/04
Inventor 郑玉峰陈枫田兵李莉
Owner HARBIN ENG 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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap