Why We Use Zirconium-Based Coatings for Durable/Decorative PVD
When exploring durable/decorative PVD coatings, you might notice that zirconium often serves as the base material–and there is an excellent reason for that. The initial use of hard PVD coatings for durable, decorative thin films used a titanium base, gold-colored titanium nitride (TiN), to be exact. However, the industry quickly found that zirconium-based coatings provided more value for both performance and color palette.
The benefits of zirconium-based coatings
In the late ’90s, polished brass finishes were all the rage in home decor–from door hardware to plumbing fixtures and everything in-between. Once engineers discovered that zirconium nitride (ZrN) can imitate natural brass, the floodgates were opened. Next came a rush to introduce finishes with lifetime durability guarantees. As with all decorative trends, times change, and soon, metallic finishes like stainless steel and nickel replaced brass as the dominant finish and, more recently, bronzes, rose golds, and blacks. Fortunately, zirconium is the chameleon metal that can respond to these evolving trends.
Engineers can quickly formulate zirconium-based coatings to make a wide range of colors using the cathodic arc deposition method found in VT-series PVD coating systems. We start with pure zirconium, evaporate and ionize the metal in a vacuum chamber while introducing precise amounts of reactive gases such as nitrogen, oxygen, methane, or acetylene to form the compounds that generate these various colors. Adding nitrogen to create zirconium nitride (ZrN) compounds results in yellow tones ranging from nickel to brass. To produce reddish golds and bronzes, add carbon-based gas (methane or acetylene) along with nitrogen to form zirconium carbonitrides (ZrCN). We can also mix oxygen with a carbon gas to form zirconium oxycarbides (ZrOC) that create darker colors from graphite to black to oil-rubbed bronze. Simple modifications can make a wide range of colors with a single metal – Zirconium!
Performance and durability of Zirconium-based coatings
Zirconium-based coatings have exceptional resistance to a wide variety of chemicals, both acids and alkaline, making these coatings the preferred choice for applications where harsh cleaning chemicals or corrosive environments could damage uncoated parts. These compounds are also very hard. Compared to another well-known durable finish, chrome plating, zirconium-based PVD color coatings are typically 2-3 times as hard, making them a durable choice for parts used in high-use areas or exposure to abrasive elements.
Vapor Technologies, Inc., is a PVD coating machine manufacturer located in Colorado and serving clients worldwide. In addition to our engineering and manufacturing teams, we have an extensive R&D operation, including material scientists and two distinct and well-appointed labs.
For more information about our Zirconium-based coatings and the machines that create them, please contact us today!