Performance coatings change a part or product’s external/surface properties without affecting its internal material characteristics. These coatings usually change both the hardness and toughness of the part’s surface to significantly improve durability, friction, or wear. Many types of functional coatings offer different properties for different applications. These finishes must be tested and optimized to successfully develop an ideal solution for your application. With so many options and individual companies’ collection of branded coating names, it’s easy to become overwhelmed. To simplify, we offer a brief overview of our top five performance coatings available for the physical vapor deposition (PVD) process.

Our top 5 performance coatings countdown

5. The ‘general-purpose’ pro

Zirconium nitride (ZrN) is an exceptional general-purpose coating that is very hard and tough for good wear resistance, excellent corrosion resistance, and biocompatibility. Common uses for ZrN include punching and cutting tools, machining, and medical devices.

4. The good-looking durability champ

Zirconium OxyCarbide (ZrOC) is moderately hard and tough, offering wear resistance and excellent corrosion resistance. For these reasons, it’s commonly used to coat consumer products that must be wear-resistant. This coating has a visually pleasing graphite or black appearance in addition to its functional properties.

3. Sliding into third with multiple functions

Chromium nitride (CrN) has a lot to offer. It’s exceptionally hard and tough. It reduces friction, is resistant to sliding and impact wear, has excellent corrosion and oxidation resistance, and is a non-stick option for many other materials. CrN’s many properties make it ideal for dies and molds, pump parts, Cu/Al machining tooling, engine components, and as a replacement for functional plated hard chrome.

2. Diamonds are forever (or at least for a very long time)

Diamond-like carbon (DLC) is an amorphous carbon coating—actually a whole category of materials containing varying amounts of graphite and diamond. These combinations create high hardness, low friction, resistance to sliding wear, corrosion resistance, biocompatibility, and a striking, on-trend dark-gray look. DLC is therefore suited to a wide range of uses, including automotive components, medical devices, dies, molds, firearms, cutting tools, sporting goods, and other durable consumer goods.

1.    The ‘gold’ standard

Titanium Nitride (TiN) coating is perhaps the most used, most well-known physical vapor deposition (PVD) choice. Combining a non-metallic element (Nitrogen) with a transition metal element (Titanium) forms a refractory material that is very resistant to alteration. TiN provides both good mechanical properties and a lustrous gold color. It’s used in various applications including medical devices and surgical tools, cutting/punching tools, rotating shank tools, molds/dies, and iron alloy machining.

Side-by-side functional coatings comparison

Hard vs. Tough

Although the public uses “hard” and “tough” interchangeably, the two have independent meanings in materials science. Hardness is the ability to withstand friction. Toughness is an item’s ability to resist breakage under force. Following are some real-world examples:

  • A diamond is very hard. It’s extremely difficult to scratch. However, it’s not very tough in that you can shatter it with a hammer.
  • Silly putty isn’t hard at all, but its ability to stretch and deform before breaking means it’s pretty tough!
  • Bulletproof glass is both hard and tough.

About VaporTech

Vapor Technologies, Inc. (VaporTech®) manufactures PVD coating machines that produce functional and durable-decorative (color PVD) coatings. Our systems are right-sized with a range of options. All can create these top functional coatings. Leading companies around the world, as well as medium and small operations, use our machines to coat their products. For more information, email Kevin Person.

Download Functional Coatings Guide

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