Tribological Coatings for Engine Coating and DLC Coating Applications

Tribological coatings minimize friction and wear on components such as those found in automotive engines. Hauzer Techno Coating offers tribological coatings such as DLC, CrN and ta-C for bulk production.

The key purpose of tribological coatings is for the reduction of friction and wear between interacting surfaces that are in relative motion. Hauzer Techno Coating is a leader in the tribological coating field. Component manufacturers and certified job coaters such as France, Czech Republic, Japan, China, Korea, Brazil and USA apply their PAVCVD coatings with Hauzer coating equipment.

Hauzer takes part in a number of development projects with international automotive OEMs, research centers, component manufacturers and universities.

Engine Coating

Each year, there are stricter regulations imposed for engine components. Common rail fuel injection needs multiple injections for each cycle in order to improve combustion. However, in the case of cars, several million injections are needed without considerable wear of engine components. Also, heavy duty manufacturers require that engines last at least one million miles without any significant wear. Every year, the European emission norm becomes ever more strict and is applied on a global scale.

One way to stick to these regulations and enhance engine performance is by using PACVD and PVD coatings on components. This can be achieved by developing appropriate plasma coatings for specific components in line with better wear resistance, lubrication and friction reduction.

The lifetime of a engine can be considerably extended by applying a PVD or PACVD coating on engine components. PVD or PACVD coatings are also applied to reduce friction. In a normal car at least 10 to 15% of the used energy is spent on friction losses.

It is possible to achieve a friction reduction of 40% because of a tribological diamond like carbon coating (DLC) applied to components such as valve train components. It is highly cost effective to apply the DLC coating using PACVD technology since no costly target materials are required.

The key benefits of engine coatings are:

  • Better friction reduction and wear resistance
  • Higher fuel economy
  • Lower carbon dioxide emissions

The following engine components are normally coated with tribological PVD coatings and PACVD coatings:

  • Turbo diesel injection parts
  • Valve train components
  • Piston pins
  • Piston rings
  • Gears
  • Drive train components
  • Roller / sliding bearings

DLC Coating Tribo

The DLC coating is used mostly in the automotive market in order to achieve friction reduction on engine components.

When this development began, the introduction of high pressure diesel fuel injection system in 1995, Hauzer developed the coating technology and equipment. Hauzer is now an expert on DLC coating technology and its production in round-the-clock operated systems from then on.


When first introduced in the market the DLC coating commonly used was metal DLC coating. This is applied on the engine component using sputtering technology. A typical friction coefficient of metal DLC coating is in the 0.1 to 0.2 range. Typical applications for metal DLC coatings are bearings, gears

Typical applications for metal DLC coating are gears, bearings, turbo diesel injection parts and piston rings.


The next step was developing a DLC coating applied using PACVD technology. No costly target materials are required.

A typical DLC coating friction coefficient applied using PACVD technology is in the 0.05 to 0.15 range. Typical DLC coating applications are turbo diesel injection parts, piston rings, piston pins and valve train components.


Presently and in the future, DLC coatings and other low friction coatings will diversify. Combining the specific component along with the lubricant and coating will help in achieving the right friction reduction. Hauzer offers a number of solutions to this extent such as ta-C coating, a hydrogen-free carbon coating. Arc technology is used to apply the ta-C coating. A typical friction coefficient of ta-C is in the range of 0.02 and 0.1. Except ta-C, Hauzer also offers Silicon-doped DLC coating (a-C:H-Si) and sputtered carbon (a-C).

About IHI Hauzer Techno Coating B.V

Hauzer is part of the IHI Group based in Japan. IHI Corporation was founded 160 years ago and the group of companies share a focus on engineering and technology.

Hauzer's total commitment to the needs of its customers worldwide has been crucial to its success. More than seventy companies, many with multiple systems, enjoy the benefit of this commitment, from PVD process development up to global customer support. Some global companies owe their prominent market position to Hauzer PVD coating technology.

This information has been sourced, reviewed and adapted from materials provided by IHI Hauzer Techno Coating B.V.

For more information on this source, please visit IHI Hauzer Techno Coating B.V.


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