First, the use of
titanium film
Titanium plating is generally used to improve the surface wear resistance of objects, for example, the tap and drill used in the high-speed machining center can be coated with titanium to improve the wear resistance of the tool, and the piston ring surface treatment is also coated with titanium, also in order to improve the wear resistance.
There are also decorative titanium plating, not as good as the similar gold rings you can buy on the street for a few dollars, which are usually plated in titanium. Mainly is the color golden, good-looking, prevent object surface oxidation, rust, etc.
Second, titanium plating commonly used process
1. Titanium plating process: vacuum coating and spraying process.
Vacuum coating includes: magnetron sputtering method, arc ion plating method, etc., if nitrogen can form titanium nitride in the coating process, the coating color is golden, otherwise white. The coating is thin, generally about 15 microns, and the coating is bright and does not need follow-up processing.
The method of spraying is cold spraying. The coating is very thick and can reach the order of millimeters, and the surface roughness requires subsequent processing.
2. Titanium carbide and titanium nitride coating difference:
Different colors: Titanium carbide (black) Titanium nitride (gold).
Hardness difference: titanium carbide than titanium nitride hardness is higher.
But the high temperature oxidation resistance of titanium carbide is not as good as titanium nitride, so the carbon titanium nitride film is derived. In recent years, there are more popular titanium aluminum nitride, chromium nitride film, etc.
Titanium carbide process is more difficult than titanium nitride process, the control range is narrower.
The above two plating processes have been very mature, divided into decorative plating and tool plating, decorative plating is generally very thin not more than 1 micron, tool plating requirements thick 3-5 micron.
3. The reason why the film layer is rough: such as the substrate surface finish is not high, the surface ion bombardment before the coating is too long, etc.
