Removing Tungsten DLC

K

knucks

Joined
Apr 26, 2005
Messages
163
I got my Kershaw Blur PE about a week ago, I think it's an alright knife except for the coating. I never really cut anything up with it except for today when i cut up a tissue box to see how it could cut thin cardboard. It turns out it was a bad idea because i have about 5 really ugly scratches on the blade (it did slice the tissue box in half though:D ) I really hate to see my new toy all scratched up so i want to remove the coating. I want to ask if there is anything faster than sanding it off, and if there is not what grits of sandpaper do I need to go through? Also, do I have the remove the blade cause it would be a pain in the ass taking it apart and putting it together, but if i do what bit would i have to use to take it apart. Thanks guys, any input is appriciated.
 
Are you certain these are scratches and not simply some sort of material left by the cardboard? Have you tried thoroughly wiping the blade with something like CLP or RemOil? All coatings can scratch with use, but I can't imagine the type of scratching you're describing being caused by a tissue box.
 
Padawan is right. It is well past unlikely that you scratched a Tungsten DLC coating on cardboard -- those are just marks that will wipe off with something like CLP, or RemOil, or even good old WD40.
 
yep i agree, the DLC will scuff/scratch up but i wouldnt think a kleenex box would do it (i dont think anyway).

i dont think the coating would be easy to remove either and without a lot of work its gonna look crummier than if ya left it alone, i can relate though that used to really bother me too when they got scuffed up, and yes they will get scuffed yup with use thats just the nature of the beast.

that is why i dont like coatings myself.
 
Let's see if I understand this correctly; your blade is DLC coated. DLC stands for Diamond Like Coating and is a carbide coating that approaches the hardness of diamonds, around Rc 90. The underlying steel is probably around Rc 60. The sandpaper you're talking about is probably around Rc 65, so it's a little harder than the heat treated steel, but not nearly as hard as the coating.

The Kleenex box is probably Rc 20 if that.

There's no way in hell a Kleenex box will actually scratch a DLC coated blade.

In my experience, DLC coated blades will hold on to fingerprints and residue like no plain steel blade I've seen. Simple Green won't clean them. Amonia won't clean them. However, Goo Gone, or Carb-o-Sol (available at hardware stores) will easily wipe off any adhesive based contamination. WD40 will probably work as well, but will leave a film where the Goo Gone will not.
 
Not to fuel the fire, but since "any input is appreciated" well then, I would agree and say, "NO way would that tissue box scratch the DLC coating!"

J. MacDonald's breakdown is correct - or, at least you get a jist of what he's saying.
 
moving-van.jpg
 
Are you sure it is DLC? Teflon coating is scratched really easily by cardboard. If it is DLC, those are not scratches.

P.S. to extrapolate the Rockwell scale to diamond is a bit misleading. Diamond is about 8 times harder than hardened steel. Looking at the extrapolated Rc scale on might think it is only 1.5 times as hard as hardened steel. For anything much outside of 75 Rc the Vickers or Knoop scale is much more appropiate.

Cougar: I love the licence plate. Never noticed that before :D.
 
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