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首页> 外文期刊>Inorganic materials: applied research >Interaction of WC and Cr 3 C 2 Carbides at Heat Treatment of WC–Cr 3 C 2 –Cu Alloys
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Interaction of WC and Cr 3 C 2 Carbides at Heat Treatment of WC–Cr 3 C 2 –Cu Alloys

机译：Interaction of WC and Cr 3 C 2 Carbides at Heat Treatment of WC–Cr 3 C 2 –Cu Alloys

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We obtained WC–Cr_(3)C_(2)–Cu composite alloys by the copper melt infiltration into uncompacted WC and Cr_(3)C_(2)powders (the reference alloys) and their mixtures with the weight ratio WC : Cr_(3)C_(2)= 1 : 1. Impregnation of the uncompacted carbide powders with the copper melt was performed at low-frequency (~80 Hz) vertical vibration (LFV) of the crucible with the alloy components for 10 min in a resistance furnace under a flow-through argon atmosphere. We studied the influence of the heat treatment of the obtained model composites on interaction of the WС and Cr_(3)С_(2)carbides under isothermal and dynamic temperature impact, as well as during high-speed cyclic heating of the alloy surface by an electric arc (120 A, 45 V, 2 Hz, 10?000 arc interruption cycles). We investigated the evolution of alloy structures by means of electron microscopy, X-ray spectral microanalysis, X-ray phase, and differential thermal analysis. We show that the impact on the sample surface by the temperature field created by the electric arc leads to intense interaction of the carbides. Here, the matrix copper transforms periodically into a melt and plays the role of a transfer medium (the diffusion medium). As a result of such heat treatment, in the upper layers of the alloys, finely dispersed compositions of complex carbide phases occurred with the sizes ≤1–2 μm, i.e., 1–2 orders of magnitude less than that of the initial carbides.

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