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Properties of Cu-W Functionally Graded Materials Produced by Segregation and Infiltration

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Abstract:

The Cu/W functionally graded material (FGM) was produced by vibration of W agglomerates in order to obtain the W skeleton with a gradient in porosity, which after pressureless sintering was infiltrated with molten Cu. Certain sintering mechanisms are suggested for these complex W structures. The segregation of two different sizes of W agglomerates was controlled by vibration time. Different vibration duration resulted in different types of microstructure: skeleton type microstructure after shorter vibration time and graded type microstructure after extended vibration times. The final Cu-infiltrated FGMs were characterized microstructurally and their electrical resistivity (r) was measured using the 4-probe technique. The values of r were in between those for pure W and Cu, depending strongly on the vibration times of the initial W agglomerates, and exhibiting particular r vs. T (K) behavior.

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Periodical:

Materials Science Forum (Volumes 492-493)

Pages:

123-128

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.492-493.123

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Online since:

August 2005

Authors:

D. Janković Ilić, J. Fiscina, C.J.R. González-Oliver, F. Mücklich

Keywords:

Cu-W Graded Material, Electrical Resistivity, Segregation, Sintering

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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