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Synthesis and processing of nanocrystalline Ag–Fe–Ni for low thermal expansion–high conductivity thermal management applications

Published online by Cambridge University Press:  31 January 2011

J. Stolk ,
M. Gross ,
D. Stolk  and
A. Manthiram
J. Stolk
Affiliation:
Chemical Engineering Department, Bucknell University, Lewisburg, Pennsylvania 17837
M. Gross
Affiliation:
Chemical Engineering Department, Bucknell University, Lewisburg, Pennsylvania 17837
D. Stolk
Affiliation:
Metallurgical Engineering Services, Inc., 845 East Arapaho Road, Richardson, Texas 75081
A. Manthiram
Affiliation:
Texas Materials Institute, ETC 9.104, The University of Texas at Austin, Austin, Texas 78712
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Abstract

Nanocrystalline Ag–Fe–Ni powders were produced by a reduction of the aqueous metal ion solutions with sodium borohydride and then converted to fine-grained silver–Invar alloys that offer attractive thermal, electrical, and mechanical properties. The samples were characterized by x-ray diffraction, scanning electron microscopy, wavelength dispersive x-ray spectrometry, thermomechanical analysis, microhardness measurements, and electrical conductivity measurements; thermal conductivity was estimated using the Wiedemann–Franz law. Sintering of a specimen with a nominal composition of 60 wt% Ag–25.6 wt% Fe–14.4 wt.% Ni led to the formation of a two-phase silver–Invar alloy with a grain size of approximately 2 μm, a hardness of 133 HK200g, coefficient of thermal expansion of 12.44 × 10−6 / °C, and electrical conductivity of 2.13 × 105 (Ω cm) −1.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 340 - 343
Copyright
Copyright © Materials Research Society 2001

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References

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