Zirconium nitride is a monolayer PVD ceramic hard nitride, deposited as a thin film on tooling and instruments. It sits in the same family as TiN but runs harder and carries a paler, champagne-gold tone. It exists for jobs where a TiN-grade decorative finish is wanted alongside better wear resistance and anti-galling behavior, particularly against non-ferrous workpieces that tend to load up and stick on bare tooling.
What the numbers say
- Hardness lands at roughly 2400-2900 HV with a typical near 2800 HV. This is coating microhardness, not the bulk value, and the spread reflects three independent vendor figures. [balzers, vergason, cgs]
- Maximum service temperature is bounded by oxidation onset, converging on about 565-600 C. The literature places oxidation onset as low as 500-550 C, so do not treat the upper figure as a hard ceiling. [vergason, cgs, researchgate_oxidation]
- Coefficient of friction against steel sits near 0.5 in vendor dry-sliding figures; a wider 0.21-0.66 band is reported against hardened/bearing steel (e.g. 100Cr6), dry and unlubricated, though the vendor 0.5 figures name no counterface. [vergason, cgs, researchgate_friction]
- Film thickness runs 1-5 um, typically 1-2 um, deposited at roughly 350-500 C. [vergason, cgs]
Where it fits
ZrN earns its place on non-ferrous machining tools (aluminum, brass, copper alloys, titanium), where its low friction and anti-galling surface keep soft, sticky swarf from welding to the cutting edge. It is also the most biocompatible of the common hard nitrides, which puts it on medical and surgical instruments and implants. On drills, burs and forming tools it offers low stick-out and clean release, and its pale gold appearance makes it a decorative TiN alternative on consumer hardware.
These are general process properties for understanding tradeoffs between coatings, not a specification for your application. Validate against your own substrate, geometry, and duty cycle before relying on any figure here.