Hard Corrosion-Resistant Coatings for Constructional Applications |
24.12.2009 г. |
Hard Corrosion-Resistant Coatings for Constructional Applications Yu. V. Lakhotkin, V. P. Kuzmin, and V. L. Goncharov Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia e-mail:
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Abstract—This is an overview of modern methods used to harden metal products. Capabilities and drawbacks of each method are analyzed with respect to requirements imposed on coatings intended for use in precision engineering. A fundamentally new approach to the creation of nanostructured hardening layers at low temperatures has been proposed. Three classes of tungsten carbide coatings that mutually differ by the combination of their microhardness, viscosity, and thickness have been described. Some physicochemical features of the synthesis of tungsten carbide compounds, their structure, and their mechanical properties have been established. According to tribological tests, the abrasive resistance of tungsten semicarbide is almost twice as high as the abrasive resistance of the VK-6 hard alloy. The absolute abrasive wear resistance of the carbide coating in the presence of a lubricant is ten times higher than that of the hard alloy. Particular applications of the tungsten carbide coatings and their advantages over commercially available materials and coatings have been described. DOI: 10.1134/S2070205109070156
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