Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Zn-containing NiMn magnetic shape memory alloy and preparation method thereof

A memory alloy and alloy technology, applied in the field of shape memory alloy and its preparation, can solve the problems of ineffective control of Zn volatilization loss, uneven sample composition, poor performance consistency, etc., to solve the problem of easy fracture, obvious magnetic strain, and toughness Improved effect

Active Publication Date: 2018-06-01
天津一介电力科技有限公司
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nominal doping amount in the literature is very low, the highest is only about 3% of the atomic ratio, and the author admits in the literature that the volatilization loss of Zn cannot be effectively controlled during the smelting process, resulting in the actual composition of the sample being much lower than this value , significantly deviated from the original ratio
This leads to inhomogeneous sample composition and poor performance consistency, which greatly limits the practical application of Zn in NiMn-based magnetic shape memory alloys.

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
  • Zn-containing NiMn magnetic shape memory alloy and preparation method thereof
  • Zn-containing NiMn magnetic shape memory alloy and preparation method thereof
  • Zn-containing NiMn magnetic shape memory alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0032] The preparation composition is: the preparation composition is Ni 51 Mn 27 Ga 18 Zn 4 , Ni 51 Mn 27 Ga 16 Zn 6 , Ni 51 Mn 27 Ga 14 Zn 8 , Ni 51 Mn 27 Ga 13 Zn 9 And Ni 51 Mn 27 Ga 12 Zn 10 A series of polycrystalline magnetic shape memory alloy bulk materials are smelted in a water-cooled copper crucible with an electric arc smelting method with a current of 60A and a positive pressure of 0.03MPa argon in the furnace chamber as the protective gas. The preparation method is as follows The specific steps are:

[0033] (1) First prepare materials according to the atomic percentage content in the memory alloy;

[0034] Then prepare a master alloy: weigh the required weight of Ga and Zn elementary substances according to the atomic ratio of 1:1, and the purity is 99.9%. Put Ga in a polytetrafluoroethylene beaker and heat it at a constant temperature of 90°C in a water bath until it is completely melted. After that, add Zn powder and continue heating for 120 minutes while stirring...

Embodiment 6

[0040] Preparation composition is Ni 55 Mn 30 Sn 10 Zn 5 The polycrystalline alloy block with magnetic shape memory effect adopts the arc smelting method, with 0.02MPa positive pressure argon as the protective gas, in the water-cooled copper crucible of the arc furnace, the melting current is 85A, and the preparation method is as follows The following specific steps are carried out:

[0041] (1) First, weigh the required weight according to the atomic ratio of 2:1, and the purity is 99.9% Sn and Zn simple substance powder, the particle size is 300 mesh. Put the powder into a PTFE grinding tank after preliminary mixing, add PTFE grinding balls according to the ball-to-material ratio of 12:1, vacuumize, install on the ball mill, install 250 rpm ball mill for 80 minutes, then open the can and take it out Alloy powder. The powder is compressed on a tablet machine into tablets of appropriate size. Wrap the pressed alloy powder sheet with a tantalum sheet, place it in a quartz tube, ...

Embodiment 7

[0046] Preparation composition: Ni 55 Mn 33 In 8 Zn 4 The magnetic shape memory alloy polycrystalline ribbon with a magnetic field-driven martensite transformation effect; wherein the steps to obtain a polycrystalline alloy ingot are the same as in Example 2, except that the speed of the ball milling tank is 150 rpm, and the ball to material ratio is 8 :1. The argon pressure during smelting is 0.04MPa. Then put the obtained ingot into a quartz tube with an opening at the bottom, and place it in the furnace chamber of the stripping machine, and evacuate to 5×10 -3 Below Pa, high-purity argon gas is introduced into the furnace cavity, the pressure is -0.07MPa, the alloy is in a molten state by induction heating, and then high-purity argon gas with a certain pressure is blown from the upper part of the quartz tube to make the molten alloy liquid from the small hole The medium jet is quickly thrown out on a high-speed rotating copper wheel with a linear velocity of 25m / s, and a poly...

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
widthaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a Zn-containing NiMn magnetic shape memory alloy and a preparation method thereof. The chemical formula of the Zn-containing NiMn magnetic shape memory alloy is NixMnyMzZna, wherein M is a main group element, 50.5<x<58, 26<y<36, 5<z<20, 3.9<a<11, x+y+z+a=100, and x, y, z and a represent atomic percentage. The M can be In, Sn or Ga; the Zn-containing NiMn magnetic shape memory alloy is a polycrystalline block material or polycrystalline belt material. The preparation method of the Zn-containing NiMn magnetic shape memory alloy can effectively inhibit loss of Zn during synthesis, ensure constituent consistency and accordingly facilitate scale industrial production. The constituents and the phase change temperature of the Zn-containing NiMn magnetic shape memory alloyprepared through the method can be adjusted within a relatively large range, the mechanical performance of the Zn-containing NiMn magnetic shape memory alloy can be improved, so that the Zn-containing NiMn magnetic shape memory alloy can meet the demands of different working environments.

Description

Technical field [0001] The invention relates to a shape memory alloy with ferromagnetism and magnetic control shape memory effects and a preparation method thereof, in particular to a NiMn series magnetic shape memory alloy with high Zn content with controllable magnetically induced strain and a preparation method thereof. Background technique [0002] Common shape memory alloys have a crystal structure (hereinafter referred to as austenite phase) at relatively high temperatures, and spontaneously become another crystal structure at relatively low temperatures, generally called martensite phase . When the temperature is lowered from a higher temperature to a lower temperature, the material transforms from the austenite phase to the martensite phase, which is called martensite transformation. Conversely, heating the material from a relatively low temperature will transform the alloy from the martensite phase to the austenite phase. This opposite structural transformation is calle...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/03H01F41/00C22C19/03C22C1/03C22F1/10
Inventor 罗鸿志倪昭宁郭星妙刘晓童孟凡斌
Owner 天津一介电力科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com