Accelerated thermal degradation of DLC-coatings via growth defects

Experimental investigation on chromium-diamond like carbon (Cr-DLC) coating through plasma enhanced chemical vapour deposition (PECVD) on the nozzle needle surface

“…To understand the surface of white spots were conducted chemical composition scanning using Energy-dispersive X-ray spectroscopy (EDX) ( The occurrence of this type of defect may be due to the transition layer where Cr percentage became lesser than C, as poor adhesiveness or uneven coating on the substrate. Because, a single DLC coating may have poor adhesion with the substrates, a Cr layer is added to achieve better adhesiveness behavior with the steel substrate [1]. The presence of Fe in a higher amount of 4 wt.% could be related to delamination of coated particles.…”

“…In addition, they have greater physical properties due to its superior properties of hardness, thermal stability, low friction coefficient, and excellent wear resistance. DLC also provides a good diffusion barrier to moisture, gas and excellent properties which make the DLC coating appropriate to be used for use in anti-wear field [1].…”

“…The dominant adhesive behaviour and thermal stability permits to increase the stress corrosion resistance at interface due to its characteristics, lubricity of DLC [1]. The PECVD-Si coatings on Ti substrate surface strongly adhered on the substrate and was noted having superior resistance to delamination [13].…”

Enhancement of sp3 C Fraction in Diamond-like Carbon Coatings by Cryogenic Treatment

“…At present physical and plasmaenhanced chemical vacuum vapor depositing are still the main methods to prepare DLCs in which the energic C + impinges the top surface and implants into the subsurface to create a thermal spike site with high intrinsic stress and high local temperature, thus, stabilize the sp 3 C hybrid [11]. Thus, the sp 3 C fraction can be controlled by varying the depositing parameters, such as bias voltage, working gas, doping species, and even the multiple layer structure [12][13][14][15][16][17]. The sp 2 C/sp 3 C bonding ratio plays a crucial role in determining the performance of DLCs [18][19][20].…”

Study of DLC Formation with Ion-Beam Assisted Magnetron Sputtering Deposition

“…DLC is a very promising carbon material with flexible sp 3 /sp 2 bond ratios. DLC thin films have characteristics of high hardness, low friction coefficient, strong wear resistance, and good thermal conductivity [1][2][3][4][5]. Therefore, DLC thin films can be widely used as surface modification materials in mechanical, automotive, medical, and electronic fields [6][7][8][9].…”