How do you get yellow on the surface of the drill bit?
The Yellow above the drill is not baked. It is a kind of coating which is evaporated and ionized by the titanium metal in the high temperature and high vacuum environment. At the same time, the coating is added to the metal surface after the reaction of the reaction gas. It is also called PVD coating.
One is simple plating, and the other is complicated surface treatment, such as ion sputtering
Coated cutting tools are in hard alloy high strength and toughness or high speed steel (HSS) on the body surface by vapor deposition method is coated with a thin layer of good abrasion resistance of refractory metal or non metal compounds (can also be applied in ceramics, superhard materials such as diamond and cubic boron nitride blade) obtained. The coating acts as a chemical barrier and thermal barrier, reducing the diffusion and chemical reaction between the tool and the workpiece, thereby reducing the wear of the crescent groove.
