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Method for producing a monocrystalline body from a magnetic shape memory alloy

一种单晶、晶体的技术，应用在单晶MSM-体领域，能够解决成核晶体成本昂贵、难操作等问题，达到边脚料减少、检验布置减少的效果

Active Publication Date: 2015-04-29
ETO MAGNETIC GMBH
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Problems solved by technology

But this approach is problematic in several ways; not only are suitable nucleating crystals expensive and difficult to manipulate, especially for industrial manufacturing processes outside of laboratory settings, but such nucleating crystals also require very precise process control To achieve the correct nucleation characteristics (provided the nucleation crystal has a material that rejects the alloy, the component may also have other defects)

Method used

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  • Method for producing a monocrystalline body from a magnetic shape memory alloy
  • Method for producing a monocrystalline body from a magnetic shape memory alloy
  • Method for producing a monocrystalline body from a magnetic shape memory alloy

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Embodiment Construction

[0031] figure 1 This shows the principle with which the invention can be realized according to a first exemplary embodiment. The figure shows the so-called mold shell for producing single crystals according to the so-called Bridgman method (Bridgman-Verfahren), which mold shell extends perpendicularly from the cold plate 20 along the longitudinal axis (dashed line 22), forming a formation A core region (Ankeimbereich) 24 , a selector region (Selektorbereich) 26 following this nucleation region and a crystal region (Kristallbereich) 28 . The suitably melted alloy material is inserted into the device through the upper opening 30, and the liquid alloy material is then solidified from bottom to top (arrow 32) under the condition of forming a corresponding upwardly moving solidification front, the movement speed of the solidification front is controlled by a suitable Temperature affects reservations.

[0032] figure 1 (akin figure 2 ) shows how the solidification path accord...

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Abstract

A method for producing an MSM actuator element, having a crystal orientation along a first crystal axis, from a monocrystalline MSM body by introducing a molten alloying material into a molding shell and subsequently solidifying the alloying material, comprising the following steps: providing a molding shell which comprises a nucleation region (24), a selector region (26) and a crystal region (28) and is oriented along a longitudinal axis (22) at least in some sections, introducing the molten MSM alloying material, in particular NiMnGa-based alloying material, into the molding shell without providing a separate nucleation crystal, compacting the MSM alloying material by generating a solidification front moving from the nucleation region across the selector region into the crystal region along a solidification path.

Description

technical field [0001] The invention relates to a method for producing a single-crystal MSM-body for producing an MSM-actuator, and also to such a single-crystal MSM-body, how it is produced by this method. Background technique [0002] MSM-actuators (also called "MSM-actuators") are generally known in the prior art and utilize the effect that, under the influence of a magnetic field, so-called magnetically controlled shape memory materials (MSM=magnetic Controlled shape memory) to implement an expansion motion (typically in the single-digit percentage range based on the length of each MSM-body along the expansion direction), may be the basis for the drive and may be known in this regard by means of permanent magnets and An alternative to an electromagnet-implemented adjustment element. [0003] Apart from the alloy used (typically NiMnGa-based alloys), the effectiveness of such an MSM actuator or MSM actuator is decisive for the crystallographic orientation along which the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/20C30B11/00
CPCC30B11/00C30B11/14C30B29/52H01F1/0308H10N35/85H10N35/01B22D23/00
Inventor M.劳芬伯格E.帕古尼斯A.德雷弗曼L.斯特茨
Owner ETO MAGNETIC GMBH
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