CN-115324854-B - Electrically driven shape memory alloy skeleton member

CN115324854BCN 115324854 BCN115324854 BCN 115324854BCN-115324854-B

Abstract

The application provides an electrically driven shape memory alloy skeleton member which comprises a shape memory alloy body, an insulating layer, a heating layer and a heat insulation layer, wherein the shape memory alloy body is provided with a high-temperature phase shape and a low-temperature phase shape, the insulating layer, the heating layer and the heat insulation layer are sequentially covered on the surface of the shape memory alloy body, the heating layer is used for being electrically connected with an external power supply, and the heating layer is used for adjusting the temperature of the shape memory alloy body so as to change the shape of the shape memory alloy body. The electrically driven shape memory alloy skeleton member is suitable for memory alloy members with various shapes and has an application range.

Inventors

HAO SHIJIE
LI HAOHANG
YANG YING
CHEN XIAONAN
CUI LISHAN

Assignees

中国石油大学(北京)

Dates

Publication Date: 20260505
Application Date: 20220726

Claims (3)

1. The electrically driven shape memory alloy skeleton member is characterized by comprising a shape memory alloy body, an insulating layer, a heating layer, a heat insulation layer, a first electrode and a second electrode, wherein the insulating layer is coated on the surface of the shape memory alloy body, the heating layer is coated on the surface of the insulating layer in a soaking way, and the heat insulation layer is coated on the surface of the heating layer; The shape memory alloy body is provided with a high-temperature phase shape and a low-temperature phase shape, the insulating layer, the heating layer and the heat insulation layer are sequentially covered on the surface of the shape memory alloy body, the heating layer is electrically connected with an external power supply through the first electrode and the second electrode, and the heating layer adjusts the temperature of the shape memory alloy body so as to change the shape of the shape memory alloy body; the shape memory alloy body is of a truss structure, the insulating layer is wrapped on the outer wall surface of the shape memory alloy body, and the heating layer and the heat insulation layer are sequentially laminated outside the insulating layer; The first electrode and the second electrode are truss structures, the first electrode and the second electrode are respectively arranged at two ends of the shape memory alloy body and are electrically connected with the heating layer, and two ends of the heat insulation layer extend to part of side wall surfaces covering the first electrode and the second electrode; the heating layer completely wraps the insulating layer, and the first electrode and the second electrode are respectively attached to the two side end surfaces of the heating layer, or The heating layer wraps the side wall surface of the insulating layer, two ends of the heating layer extend to cover part of the side wall surfaces of the first electrode and the second electrode, and the first electrode and the second electrode are respectively attached to the two side end surfaces of the insulating layer.
2. The electrically driven shape memory alloy skeletal member of claim 1, wherein the heat generating layer is a graphene coating.
3. Electrically driven shape memory alloy skeletal member according to any one of claims 1-2, characterized in that the insulating layer is made of a heat conducting material resistant to high temperatures.

Description

Electrically driven shape memory alloy skeleton member Technical Field The application relates to the technical field of shape memory alloy, in particular to an electrically driven shape memory alloy skeleton member. Background The shape memory alloy (shape memory alloys, abbreviated as SMA) is a material composed of two or more metal elements having a shape memory effect by thermoelastic martensitic transformation and its inverse transformation. The shape memory alloy after special training can be in different and specific shapes in high-temperature and low-temperature states, has the advantages of high work specific gravity, low driving voltage and the like, and is widely applied to the driving field. In the related art, when a shape memory alloy is applied to the driving field, a driving action is generally performed by heating a member made of the alloy. The shape memory alloy member may be driven by a variety of heating means, such as self-heating, i.e. heating by the self-resistance of the shape memory alloy, which requires the shape memory alloy member to have a sufficiently high resistance to generate sufficient heat to effect a shape change. However, the conventional electrically driven shape memory alloy member has a high requirement for its own shape in terms of a heating method, and has a small application range, for example, it is difficult to drive a skeletal member having a complicated shape by using the conventional heating method. Disclosure of Invention The application provides a shape memory alloy component, which is used for solving the problem of smaller application range of a heating mode of the existing electrically-driven shape memory alloy skeleton component. The application provides an electrically driven shape memory alloy skeleton member, which comprises a shape memory alloy body, an insulating layer, a heating layer and a heat insulating layer; the shape memory alloy body has high temperature phase shape and low temperature phase shape, and insulating layer, zone of heating and insulating layer cover in proper order and are in the surface of shape memory alloy body, and the zone of heating is used for being connected with external power supply electricity, and the temperature of shape memory alloy body is adjusted to the zone of heating to change the shape of shape memory alloy body. According to the shape memory alloy provided by the application, the heating layer is arranged on the surface of the memory alloy body to provide heat for the memory alloy body, so that the shape memory alloy can reach the required temperature, the shape is changed, the thickness of the heating layer can be adjusted to control the resistance of the heating layer, the heating layer can generate enough heat, and the shape memory alloy is suitable for memory alloy components with various shapes and wide in application range. In addition, the surface of the memory alloy body is further provided with an insulating layer and a heat insulating layer, specifically, the insulating layer, the heating layer and the heat insulating layer are sequentially covered on the surface of the shape memory alloy body, the insulating layer is arranged between the memory alloy body and the heating layer, current can be prevented from flowing to the memory alloy body, current can flow to the heating layer with higher resistance so as to generate enough heat, the heating layer is electrically connected with an external power supply and is used for converting electric energy into heat energy so as to adjust the temperature of the shape memory alloy body, the shape memory alloy body can be transformed between a high-temperature phase shape and a low-temperature phase shape, and the heat insulating layer is covered on the outermost layer, so that the heat loss speed can be greatly slowed down, and the heat generated by the heating layer can flow to the memory alloy body as much as possible. In one possible implementation, the heat generating layer is coated on the surface of the insulating layer. In one possible implementation, the heat generating layer is a graphene coating. In one possible implementation manner, the heating device further comprises a first electrode and a second electrode, and the heating layer is electrically connected with an external power supply through the first electrode and the second electrode. In one possible implementation manner, the shape memory alloy body is of a truss structure, the insulating layer is wrapped on the outer wall surface of the shape memory alloy body, and the heating layer and the heat insulation layer are sequentially laminated outside the insulating layer; The first electrode and the second electrode are truss structures, and the first electrode and the second electrode are respectively arranged at two ends of the shape memory alloy body and are electrically connected to the heating layer, and two ends of the heat insulation layer extend to part of side wall surfaces covering t