Synthesis and characterization of diamond-like carbon coatings for drill bits using plasma-enhanced chemical vapor deposition

Abstract

This study demonstrates the performance enhancement of drill bits during dry cutting operation of LM6 aluminum alloy and bright mild steel using optimized Diamond-Like-Carbon (DLC) coatings. DLC coatings are deposited using Plasma Enhanced Chemical Vapour Deposition (PECVD) process by varying the process parameters, bias voltage, bias frequency, gas mixture, and working pressure. DLC coatings were grown over the silicon, high-speed steel, and stainless-steel pin substrate. Coating's chemical, composition, topography, and mechanical properties measurements were checked using Fourier Transform Infrared (FTIR), micro-Raman spectroscopy, Atomic Force Microscopy, and intrinsic stress & nano-hardness/micro-hardness tester, respectively. Coating deposition and optimization were carried out as per the Taguchi method. Further, the optimized DLC coatings tribological test and the effect of DLC coating on the tool life were performed. Results showed that the DLC-coated substrate had less wear loss and coe cient of friction than the uncoated substrate. The dry-cutting test showed that coated drill bits produce a better surface nish and consume less power in the drilling operation than uncoated drill bits. This is due to the low coe cient of friction and low wear loss of the DLC coatings.

Enhancing Surface Temperature Uniformity in a Liquid Silicone Rubber Injection Mold with Conformal Heating Channels

“…In addition, it was interesting to observe the surface roughness [36] of the 3D print mold on the surface of the lens using a scanning electron microscope [37] or a 3D optical profilometer [38]. Also, it was interesting to analyze the chemical composition and changes that produced variation in fabrication temperature using Raman spectroscopy [39] or at- This paper presented a conformal heating channel to enhance the temperature uniformity of the mold surface in the LSR injection molding of an optical convex lens. It should be noted that the fabricated LSR injection mold fulfilled sustainable development goals [23][24][25][26][27].…”

“…In addition, it was interesting to observe the surface roughness [35] of the 3D print mold on the surface of the lens using a scanning electron microscope [36] or a 3D optical profilometer [37]. Also, it was interesting to analyze the chemical composition and changes that produced variation in fabrication temperature using Raman spectroscopy [38] or attenuated total reflectance using Fourier-transform infrared spectroscopy [39]. This research is ongoing and the results will be presented in a later work.…”

Gradient Cr–AlN composite coating prepared on alumina-forming austenitic steel

“…Many previous studies [11][12][13] have shown that one of the most effective ways to enhance wear resistance and surface hardness is by coating it. Coating technology can be broadly categorised into two groups: one is thermal diffusion type, including gas diffusion infiltration, hot dip coating, packcementation, 13 and high-energy beam surface treatment 14,15 ; the other is deposition type, including physical vapour deposition, [16][17][18][19] chemical vapour deposition, [20][21][22] electroplating, 23,24 spraying, 25,26 micro-arc oxidation, 27,28 etc. Pack-cementation is an efficient, simple, mature, and low-cost approach for preparing metallic and ceramic coatings on metals and alloys.…”

Investigating Twist Drill Design Influence on Thrust Force and Surface Roughness in Drilling AFRP/ Al7075-T6 Stacks Materials

“…High-Speed Steel (HSS) drill bits, alloyed with carbon, chromium, molybdenum, tungsten, and vanadium, epitomize heightened hardness, heat resistance, and durability compared to standard steel bits [17]. HSS drill bits excel in drilling materials ranging from cast iron and steel to non-ferrous metals and stainless steel [18], [19]. Polycrystalline Diamond (PCD) drill bits, characterized by diamond particle-infused cutting edges bound by metal, shine in demanding tasks.…”