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The effect of tungsten particle size on the processing and properties of infiltrated W-Cu compacts

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Abstract

Three tungsten powders with average particle sizes of 8.7, 23.2, and 65.2 µm were used to make W-15Cu compacts. The compacting pressure and sintering temperature were adjusted for each powder to attain the desired skeleton density. Sintered skeletons were then infiltrated with oxygen-free copper at 1200 °C in hydrogen and in vacuum. Results showed that as the tungsten particle size decreased, higher compacting pressures and sintering temperatures were required for the same desired skeleton density. The processing parameters and the tungsten particle size caused variations in the amount of closed pores and the W-W contiguity, which in turn resulted in different infiltrated densities and resistivities. Direct infiltration on green compacts was also examined, and higher infiltration densities and lower electrical resistivities were obtained compared to those obtained by infiltrating sintered compacts. These results are discussed based on infiltrated density, differences in microstructure, and the W-W contiguity.

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Authors and Affiliations

  1. the Institute of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China

    W. S. Wang (Graduate Student) & K. S. Hwang (Professor)

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  1. W. S. Wang
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  2. K. S. Hwang
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Wang, W.S., Hwang, K.S. The effect of tungsten particle size on the processing and properties of infiltrated W-Cu compacts. Metall Mater Trans A 29, 1509–1516 (1998). https://doi.org/10.1007/s11661-998-0366-9

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  • DOI: https://doi.org/10.1007/s11661-998-0366-9

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