Special surface treatments are used for various reasons when creating a good knife. While there are many available, a few of the most popular surface treatments are:
- Tungsten Carbide Plating – While somewhat expensive, it will increase wear resistance substantially in many situations. it is normally applied to the face of the cutting edge which does not get reground. Regrinding exposes a sharp tungsten carbide cutting edge.
- Cryogenic Treatment – Here the knife is deep-frozen below -300°F and then tempered. This is a fairly expensive treatment (priced by weight), but it has shown impressive results in many cases, especially in slitting steel and textiles.
- Titanium Nitride Coatings – Has the appearance of gold, but is an ultra-hard material. It provides a nonstick surface with excellent chemical resistance that can withstand elevated temperatures and will not corrode, blister, flake or chip. Treated cutting tools typically last 3 to 10 times longer than uncoated tools.
- Teflon Coating – Used to prevent material buildup at the cutting edge, especially when cutting tacky materials such as uncured rubber.
Learn about other important processes needed to create a good machine knife:
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