Influence of Embedded Tungsten Particles on Mechanical Behaviors of CVD Diamond Coating

Abstract

Diamond coating has gained intensive attraction in the tribological field due to its high hardness. However, its weak flexibility always gives rise to the fragile crack, which causes the delamination and peeling off from substrate. In this work, a novel deposition method combining the conventional hot filament chemical vapor deposition (HFCVD) and particles doping technique is proposed to balance the hardness and flexibility of diamond coating, by which the diamond coating with tungsten particles is deposited on the co-cemented tungsten carbide substrate. The as-deposited diamond coating is characterized by scanning electron microscopy (SEM) analysis, surface roughness and Raman spectrum. The indentation tests are conducted to evaluate the crack propagation of diamond coating. Tribological behavior is examined on a reciprocating ball-on-plate tribometer. The results indicate that tungsten carbide may be formed between tungsten particles and diamond coating. The W–WC–amorphous carbon–diamond structural coating can validly inhibit the crack propagation and decrease the friction coefficient. Hence, adding embedding particles into the diamond coating may provide a useful way in enhancing the mechanical properties of diamond coating.

Mechanism of different adhesive strength of chemical vapor deposition diamond coatings on WC-Co and Si3N4: from surface morphologies during growth

“…Figure 4 shows the Raman spectra of all coatings. It can be seen that all Raman curves have a sharp peak that appears near the characteristic diamond peak (1332 cm − 1 ), indicating that diamond grains were fabricated [23]. In addition, a broad peak located near 1550-1580 cm − 1 was found in the Raman spectra of the diamond coatings during the 1-2 h of growth time that was associated to be a G-peak caused by sp 2 carbon atoms [24,25].…”

Enhanced Growth Rate of Chemical Vapor Deposition Diamond Coating Motivated by Graphene Oxide

“…Chemical vapor deposition (CVD) diamond coatings have attracted intensive interest from scholars and engineers due to their remarkable properties, such as high hardness, great wear resistance and high thermal conductivity [1][2][3]. In the past decade, numerous experimental and theoretical studies were conducted to improve the properties of CVD diamond coating [4,5]. Among them, the growth rate has been considered as a greatly important deposition parameter because it plays a significant role in determining the production efficiency and the cost of CVD diamond coating [6,7].…”