When used to coat a high-speed steel bit, it prolongs the life by two or three times. Titanium nitride (TiN) – A hard ceramic material.This provides for heat resistance, lubricity, and corrosion resistance. Black oxide – The least expensive of coatings.These drill bits cannot be sharpened as the process of sharpening will remove the coating on the sharpened cutting edge: In addition to the materials that the drill bit is made of, many manufacturers coat their drill bits with various materials, providing reduced friction or wear. These are the hardest bits, able to cut anything but they are very expensive, generally used only in industry, where taking the time to replace a drill bit might delay a production line. Polycrystalline diamond – This is a man-made diamond, sintered to carbide support.Since it is expensive and very brittle, it is normally just welded to the tip of the drill bit, creating the cutting edge. Tungsten carbide (typically called just carbide) is an extremely hard material that can cut in just about anything.This allows them to withstand temperatures up to 1000 degrees.
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