Diamond-like carbon coatings on microdrill using an ECR-CVD system

Analyzing the performance of diamond-coated micro end mills

“…Previous micro drilling studies using hot-filament chemical vapor deposition (HF-CVD) diamond coatings indicated a threefold increase in the number of acceptable holes drilled in both printed circuit boards (typically a phenolic, glass fiber, and epoxy composite), and aluminum work pieces when compared to an identical uncoated tool [14][15][16]. These machining improvements are due to many favorable mechanical and tribological properties that diamond coatings possess, such as high hardness, chemical inertness, low adhesion to many materials, and low friction [15,[17][18][19][20][21]. The diamond surface has been shown to have an intrinsically low affinity for Al at the atomic scale [22].…”

“…The low adhesion of workpiece material helps prevent chips from adhering to the flute surface, hence reducing tool clogging and associated sporadic force spikes [15,[17][18][19][20][21]. This, and the low coefficient of friction, reduces the forces exhibited on the cutting tool [15,[17][18][19][20][21]. The high hardness reduces the rate of abrasive tool wear [7,15,[17][18][19][20][21].…”

“…This, and the low coefficient of friction, reduces the forces exhibited on the cutting tool [15,[17][18][19][20][21]. The high hardness reduces the rate of abrasive tool wear [7,15,[17][18][19][20][21].…”

A review of modern advancements in micro drilling techniques

“…Even though there are some disagreements regarding the pros and cons of using coating, many researchers and also industries are considering this as a promising technology in the future. Ueng et al [165,166] coated micro-drill, (e) 6000th coated (f) 10,000th coated [16].…”

Shock wave induced freeform technique (SWIFT) for manufacturing of diamond micro-tools

“…The attractive properties of diamonds include extreme hardness, high thermal conductivity, high Young's Modulus, low coefficient of friction, low wear rate, biocompatibility and chemical inertness. Microcrystalline CVD diamond (MCD) is used in the form of coating [11][12][13][14][15][16][17][18][19], however, the MCD is too thick (>2 µm) and possess rough texture thus creating the problem of blunting the micro-tools which have a typical edge radius of ~1.5 µm. In addition, MCD has inferior strength [20] and much higher friction [21] than nano-crystalline diamond (NCD).…”