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Gradation process by imbibition in WC-Co for mining tools application

Abstract : Continuous composition gradients of several millimetres were generated in commercial WC-Co cutters to improve their shock resistance. This important gradation was obtained in one-step by using the imbibition process. The effects of this thermal processing were analysed in terms of microhardness, cobalt concentration and WC grain size. A gradient of a 300 HV amplitude is measured in the 8 mm-height sample treated by the imbibition process in association with a boron-rich coating. This gradient was preserved after the HPHT (high pressure – high temperature) step used for the diamond table deposition on the WC-Co cutter. To our knowledge, such gradients have never before been reported and should certainly increase cutter service life.
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Submitted on : Thursday, March 4, 2010 - 4:28:39 PM
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Elodie Lefort-Sorlier, Christophe Colin, Alfazazi Dourfaye. Gradation process by imbibition in WC-Co for mining tools application. Advances in Materials and Processing Technologies, Nov 2008, Manama, Bahrain. pp.810-817, ⟨10.4028/⟩. ⟨hal-00461475⟩



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