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Effect of interaction between the structural components of W-Co-Sn pseudo-alloys on the kinetics of their compaction during liquid-phase sintering

  • Theory and Technology of Sintering, Heat, and Chemical Heat-Treatment Processes
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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

Compaction kinetics during liquid-phase sintering of W-Co-Sn powder composites containing 90 mass% refractory component and 10 mass% readily-melting component is studied. It is established that compaction kinetics depends markedly on cobalt content in the melt. Specimens with a cobalt content up to 3 mass% at 1200 °C (in the nonisothermal heating stage) undergo an increase in volume, and then they are compacted at a rate typical for liquid-phase sintering. The nonuniform nature of compaction is observed with an increase in cobalt in the test composites. Specimens with a cobalt mass fraction of more than 2% (cobalt content with three-phase equilibrium) experience considerable additional growth due to formation of the intermetallic compound W6Co7 whose decomposition temperature exceeds the liquid-phase sintering temperature.

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Authors and Affiliations

  1. Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev

    V. I. Nizhenko, V. Ya. Petrishchev & V. V. Skorokhod

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  1. V. I. Nizhenko
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  2. V. Ya. Petrishchev
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  3. V. V. Skorokhod
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Translated from Poroshkovaya Metallurgiya, Nos. 11–12(452), pp. 15–21, November–December, 2006.

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Nizhenko, V.I., Petrishchev, V.Y. & Skorokhod, V.V. Effect of interaction between the structural components of W-Co-Sn pseudo-alloys on the kinetics of their compaction during liquid-phase sintering. Powder Metall Met Ceram 45, 520–525 (2006). https://doi.org/10.1007/s11106-006-0114-x

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  • DOI: https://doi.org/10.1007/s11106-006-0114-x

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