Black coating question

S

SR_matt

Joined
Jan 4, 2007
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i was looking at some of the twitch II's and i saw the ones that the blades are coated in a black (TiNi IIRC is the material). how tough is the coating, im asking becasue most knives ive had with any black coating on them got scratched up some what quickly. also with the coating clog up and sharpining stones at all or should it grind of with the blade metal fine?

thanks
-matt
 
Not all black coatings are the same. Some are paint, some are powder/ epoxy, others are metal.

Titanium nitride is an extremely hard coating of metal alloy. How hard? Good knife blades measure around 57-60 Rockwell Hardness. Titanium nitride measures 85 Rockwell Hardness.

Can it be scratched? Anything can. Can it be scratched as easily a "teflon" or "powdercoat" finish? No.

Titanium nitride isn't going to come off in bits and chunks to clog your sharpening stones, either. Very little of the Ti finish will be in contact with the stone, anyway. The entire edge being sharpened isn't coated with titanium. The only place where the Ti finish will contact the stone is the exact border where the top of the cutting edge meets the coated blade surface. That's an area measured in thousandths of an inch.

You shouldn't have any problem during normal sharpening.
 
fantastic, so in reality i could expect it to scratch even less than a plain steel blade or not necessarily?

ya i know there are many differant coatings and definatly didnt expect my other experances to have been anything i could really use as comparason.

thanks
-matt
 
An uncoated SOG Twitch blade has a Rockwell Hardness of 57-58. The coating titanium coating has a Rockwell Hardness in the mid 80s. Logically, because it is harder, it should be more scratch resistant than uncoated steel. ;)
 
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