Titanium alloys are prized for their strength, but their low surface hardness remains a challenge. Plasma nitriding of titanium offers a definitive solution, modifying the surface from the inside out to eliminate galling and wear. In this guide, we explore how cathodic sputtering breaks the oxide barrier, the anatomy of the TiN compound layer, and why hot-wall technology is critical for achieving consistent metallurgical results in these high-performance alloys.

The ‘Eggshell Effect’ in Titanium occurs when ultra-hard coatings are applied directly onto soft titanium substrates. Under high contact loads, the brittle coating cannot follow the plastic deformation of the substrate, leading to cracking and delamination. This article explains the mechanics behind this failure and how plasma nitriding–based duplex treatments create the load-bearing support required for reliable coated titanium surfaces.