Abstract
Abstract Chromium carbide (Cr3C2) coatings on the diamond were fabricated using the mixtures of molten salt of NaCl and BaCl2, powders of metallic chromium and diamond as raw materials in the temperature range of 750–900 °C by the microwave-assisted molten-salt synthesis. The morphology, microstructure and phase composition of the surface layer were characterized by Scanning Electron Microscopy, Energy-dispersive Spectrometry and X-ray diffraction. The results show that the surface of the diamond particles could be coated with Cr, forming a uniform and continuous Cr3C2-coated layer. The coatings thickness on the diamond can be controlled by adjusting the heating temperature and time. The coating thickness expanded from 0.73 to 2.30 µm when the temperature was increased from 750 °C to 900 °C, and increasing rapidly during the temperature range of 800 °C–850 °C, the coating thickness expanded from 1.30 to 2.80 µm when the holding time was increased from 0.5 h to 4 h. The results illustrate that the microwave-assisted molten salt synthesis plays a positive role in chromium coatings on the diamond, offering a potent method for the surface metallization of diamond.
Highlights
For the diamond compacts, diamond particles are usually bonded with substrates using a binder
In order to evaluate the effects of plating temperature and time on the coating thickness, the Cr/diamond samples were heated at temperatures of 750, 800, 850, and 900°C for 1 h, respectively, and heated at 850°C for 0.5 h, 2 h, and 4 h, respectively
The diamond coating was prepared by heating the wellblended mixtures of 20 g molten salt of NaCl and BaCl2 (1:1), 10 g metallic chromium and 10 g diamond powder by a microwave furnace at the heating rate about 30°C/min The chromium was embedded in the salt mixture, because this procedure was assumed to be protective against a reaction of chromium with the oxygen in the atmosphere
Summary
Diamond particles are usually bonded with substrates using a binder. The results illustrate that the microwave-assisted molten salt synthesis plays a positive role in chromium coatings on the diamond, offering a potent method for the surface metallization of diamond.
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