Nickel Fiber Silicone-Matrix Composites as Resilient Electrical Conductors

[+] Author and Article Information
Mingguang Zhu, D. D. L. Chung

Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, NY 14260

J. Electron. Packag 113(4), 417-420 (Dec 01, 1991) (4 pages) doi:10.1115/1.2905429 History: Received March 25, 1991; Revised September 11, 1991; Online April 28, 2008


Short nickel fiber silicone-matrix composites containing 3–12 vol. percent fibers were fabricated by the impregnation of silicone into a nickel fiber perform. The composites exhibited volume electrical resistivity ranging from 4.5 × 10−4 to 2.8 × 10−3 ohm.cm, contact electrical resistivity (with copper at a pressure > 0.1 MPa) ranging from 0.0090 to 0.0155 ohm.cm2 , permanent set one percent after compression to a stress of 0.4 MPa and a strain up to 13.5 percent for 7 days, and electromagnetic interference (EMI) shielding effectiveness > 50 dB at 1.0–2.0 GHz. The volume and contact resistivities were essentially not affected after heating in air at 130–150°C for 7 days. The coefficient of thermal expansion was 27.5 × 10−6 °C−1 for a composite containing 8.2 vol. percent nickel fibers. These resilient electrically conducting composites are useful for electrical contacts and for gaskets for EMI shielding.

Copyright © 1991 by The American Society of Mechanical Engineers
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