Chemical vapor deposition of diamond coatings on tungsten carbide (WC–Co) riveting inserts

RETRACTED: Development of a dual-layered diamond-coated WC–Co cutting tool for enhancing tool life in the dry machining of mild-steel alloy

“…Figure 5shows the Raman spectra of DDCS and the shift of this fundamental Raman peak toward higher value confirms the presence of residual compressive stresses in this coating. These residual stresses are calculated from s = -0.348 (v mv 0 ) GPa for the fundamental Raman peak at v m = 1336 cm 21 and v 0 = 1332 cm 21 35. Therefore, the deposited DDCS contains residual stresses of 21.4 GPa, where negative sign indicates compressive stress.…”

Influence of boron doping on mechanical and tribological properties in multilayer CVD-diamond coating systems

“…In figure 1a, the characteristic fundamental Raman peak of undoped multilayer-diamond coating system exists at 1334 cm −1 and this shift of fundamental Raman peak towards higher side of 1333 cm −1 shows that the residual compressive stresses are present. Mainly, these residual compressive stresses exist due to the difference in thermal expansion coefficients between substrate and coating [31][32][33]. Residual stresses can be calculated as −0.348(v m − v 0 ) GPa for fundamental Raman peak at v m , where v 0 = 1332 cm −1 and v m = 1334 cm −1 [26].…”

Nanocrystalline diamond coatings on the interior of WC–Co dies for drawing carbon steel tubes: Enhancement of tube properties

“…Prior to diamond deposition, the WC-6%Co dies were chemically pre-treated to remove the cobalt binder from the substrate surface in order to ensure better adhesion of the diamond coating. Details of the chemical pretreatment procedures are described elsewhere [9]. After the pretreatment, the drawing dies were seeded with diamond slurry (~4 nm diamond nanoparticles dispersed in dimethyl sulfoxide), using an ultrasonicator for 10 min and then placed on a molybdenum mesh inside the HFCVD reactor (sp3 Diamond Technologies Inc., USA).…”