Abstract
The features of intermediate layers formed as a result of solid phase contact interaction of diamond with carbon-reactive metals— chromium, cobalt, iron and titanium, were studied under temperature-time mode corresponding to the sintering of copper-impregnated cemented carbide matrices of diamond tools. The structural-phase state of the diamond-metal transition zone was studied by scanning electron microscopy, X-ray diffraction methods and Raman spectroscopy. The diamond-metal bond strength was determined by shear testing. It was found that a metal-carbide coating to diamond and consisting of the interacting metal, carbide phases, traces of oxide and graphite, with different bonding strength to diamond is formed at the transition zone during solid-state contact interaction of diamond with transition metals. The formation of a durable metal-carbide layer, essentially a metallized coating, during the contact interaction of diamond with iron and chromium can be used in the development of technology that provides an increased level of diamond retention in the cemented carbide matrix composites.
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