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Understanding Ti N, Ti F coatings-help!

2001

I'm interested in the difference between titanium nitride and titanium fluorine. Some of our high performance people are using(supposedly) TiN for gall resistance and initial friction reduction (stiction). Recently our a limited number of our products from our parent manufacturer have a TiF 'coating' claimed to be for similar purposes.

I'm not a chemist or metallurgist and am having some difficulty finding info. Ti , I thought was fairly non-reactive. Looks like I was mistaken. Also I wonder how inert nitrogen and highly active fluorine might be used in producing similar finishes on steel....So

How is Titanium deposited on steel using nitrogen in the process or final deposition, same for Fluorine ?

What are the advantages and disadvantages of each 'coating' with respect to 'stiction'(resistance to initial movement from rest) ?

Brett Christenson
- Brea California USA

2001

TiN is deposited in a number of ways. The method depends on how hot you can let the substrate get. Many carbide tool inserts are coated with TiN by chemical vapor deposition (CVD) at ~1100 C. Basically, the substrates are put into a vacuum furnace, heated to the high temperature in the presence of the appropriate gases. The gases react at the surface, depositing a TiN coating. I'm not sure of the gases that are used.

For high speed steels, 1100 °C is too high, so they are coated by physical vapor deposition (PVD) methods at ~450 C. There are several variations of the PVD method, but all of them involve reacting titanium vapor with nitrogen in a vacuum chamber. I would assume that fluorine gas can be used in lieu of the nitrogen to produce TiF, but I have not heard of this coating before.

Jim Treglio - scwineryreview.com
PVD Consultant & Wine Lover
San Diego, California

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