X-ray diffraction layer-by-layer analysis of tungsten carbide-based hard alloys
https://doi.org/10.26896/1028-6861-2020-86-8-38-42
Abstract
Improvement of the physical and mechanical properties of hard alloys based on WC – Co widely used in manufacturing of structural and tool products nowadays results from the use of novel technologies providing formation of a homogeneous high-density structures. Slight deviations of the carbon content from the equilibrium state lead to the formation of brittle η-phases (in particular, Co3W3C) and, accordingly, to deterioration of the mechanical properties of the product. We present the results of studying the homogeneity of the phase composition of the samples of hard alloys WC + 10% Co, obtained using advanced technologies of plasma-chemical synthesis and spark plasma sintering (SPS). The layer-by-layer X-ray phase analysis revealed the heterogeneity of the phase composition in depth: the brittle η-phase (Co3W3C) appears at a depth of ≥100 μm and reaches a constant value of 18 ± 1 wt.% at >200 μm, which indirectly confirms the hypothesis of carbon diffusion from graphite punches contacting with the surface of sintered samples and makes it possible to expand the range of parameters affecting the process of spark plasma sintering.
About the Authors
K. E. Smetanina
Lobachevsky State University
Russian Federation
Ksenia E. Smetanina
Russian Federation
Ksenia E. Smetanina
P. V. Andreev
Lobachevsky State University;
Institute of Chemistry of High-Purity Substances, RAS
Russian Federation
Russian Federation
Pavel V. Andreev
23, prosp. Gagarina, Nizhny Novgorod, 603950
49, ul. Tropinina, Nizhny Novgorod, 603137
E. A. Lantsev
Lobachevsky State University
Russian Federation
Evgeny A. Lantsev
Russian Federation
Evgeny A. Lantsev
M. M. Vostokov
Lobachevsky State University
Russian Federation
Mikhail M. Vostokov
Russian Federation
Mikhail M. Vostokov
N. V. Malekhonova
Lobachevsky State University
Russian Federation
Natalia V. Malekhonova
Russian Federation
Natalia V. Malekhonova
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Review
For citations:
Smetanina K.E., Andreev P.V., Lantsev E.A., Vostokov M.M., Malekhonova N.V. X-ray diffraction layer-by-layer analysis of tungsten carbide-based hard alloys. Industrial laboratory. Diagnostics of materials. 2020;86(8):38-42. (In Russ.) https://doi.org/10.26896/1028-6861-2020-86-8-38-42
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