Effects of Coating Parameters of Hot Filament Chemical Vapour Deposition on Tool Wear in Micro-Drilling of High-Frequency Printed Circuit Board

High-frequency and high-speed printed circuit boards (PCBs) are made of ceramic particles anisotropic fibres, which difficult to machine. In most cases, severe tool wear occurs when drilling high-frequency PCBs. To protect the substrate drills, diamond films typically fabricated on drills using hot filament chemical vapour deposition (HFCVD). This study investigates coating characteristics with respect different HFCVD processing parameters following from machining The results show that methane concentration, time temperature all have a significant effect grain size thickness film. film obviously decreases as does while increases. By PCBs nanocrystalline microcrystalline sizes, it is discovered longer life than films. maximum length flank diamond-coated drill nearly 90% less tools. Moreover, thinner at faster rate thicker findings highlight effects for coated process PCBs, thereby contributing production high quality industry academia.