Thin film shape memory alloy microactuators

被引：465

作者：

Krulevitch, P

Lee, AP

Ramsey, PB

Trevino, JC

Hamilton, J

Northrup, MA

机构：

[1] Lawrence Livermore Natl. Laboratory, Livermore

[2] University of California, Berkeley, CA

[3] Mech. Design and Automation Group, IBM, San Jose, CA

[4] Department of Mechanical Engineering, University of California, Berkeley Sensor and Actuator Center, Berkeley, CA

[5] Micro Technology Center, Lawrence Livermore Natl. Laboratory, Livermore, CA

[6] University of California, Los Angeles Extension Course

[7] Microelectromechanical Syst. S., Intl. Mech. Engineering Congress

[8] Chabot College, Hayward, CA

[9] University of California, Lawrence Livermore Natl. Laboratory, Livermore, CA

[10] LLNL, Physical Vapor Deposition Group

[11] University of California, Davis, CA

[12] Department of Radiology, University of California

[13] Center for Integrated Systems, Department of Electrical Engineering, Stanford University, Stanford, CA

来源：

JOURNAL OF MICROELECTROMECHANICAL SYSTEMS | 1996年 / 5卷 / 04期

关键词：

D O I：

10.1109/84.546407

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Thin film shape memory alloys (SMA's) have the potential to become a primary actuating mechanism for mechanical devices with dimensions in the micron-to-millimeter range requiring large forces over long displacements. The work output per volume of thin film SMA microactuators exceeds that of other microactuation mechanisms such as electrostatic, magnetic, thermal bimorph, piezoelectric, and thermopneumatic, and it is possible to achieve cycling frequencies on the order of 100 Hz due to the rapid heat transfer rates associated with thin film devices. In this paper, a quantitative comparison of several microactuation schemes is made, techniques for depositing and characterizing Ni-Ti-based shape memory films are evaluated, and micromachining and design issues for SMA microactuators are discussed. The substrate curvature method is used to investigate the thermo-mechanical properties of Ni-Ti-Cu SMA films, revealing recoverable stresses up to 510 MPa, transformation temperatures above 32 degrees C, and hysteresis widths between 5 and 13 degrees C. Fatigue data shows that for small strains, applied loads up to 350 MPa can be sustained for thousands of cycles, Two micromachined shape memory-actuated devices-a microgripper and microvalve-also are presented.

引用

页码：270 / 282

页数：13

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