Mission MPK (A2) Coating

W

Will Kwan

Joined
Nov 23, 1998
Messages
1,594
Is the titanium nitride coating on the MPK (A2) similar to what is used on drill bits? What is the black coating on top of the titanium nitride if they are two seperate componets.

I have noticed a tinge of gold when the black was worn away. Oddly, the black coloring usually migrated back onto the gold surface with oil.

After stabbing into a 55 gal drum a few times I found that the coating on my MPK wore off a bit along the grind lines. Not a smart thing to do, but the knife was undamaged. The black did not migrate back onto these wear areas.

Will
 
Anyone here know more about TiAlN? I know that with Glock's finish, even if the black is worn away, the tenifer remains to protect against corrosion, is that the same with TiAlN?

Will, have you seen any rust form where the coating has worn away?

Spark

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Kevin Jon Schlossberg
SysOp and Administrator for BladeForums.com

Insert witty quip here
 
TiAlN does bond to the surface of the steal, it's put on in a High Vacuum Evaporation System. But the migration of the TialN depends on the porosity of the steal, if the steal is very smooth you'll have less penetration. Of course any penetration is only a few microns so most wear marks will wipe out the coating, although the titanium is hard and should minimize the wear.

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LD
"Every Dog Has His Day"
BFC Member Since October 2, 1998

 
Cliff, I can't tell for sure if the coating flaked or wore off. I think both happened. There are two irregular spots where the coating appears to have flaked off. The boundary between coat and no coat is extremely sharp. The rest of the missing coating is worn off. The coating thins out gradually. These spots are very small, one is roughly 0.25 mm diameter and the other 0.25 mm x 0.5 mm.

Spark, there is no rust at all, but I use Rust Check on my knives. I don't think there is any coating left on surfaces that do not have a gold tinge.

The wear and flake spots are extremely minor. It did give me an opportunity to examine how the Ti Nitride at different thickness levels.

Thanks for the info on Ti. It seems to be a very durable coating compared to powder coat and hard chroming.

Will

[This message has been edited by Will Kwan (edited 17 November 1999).]
 
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