Aerospace Coatings for Extreme Performance and Extended Component Life

Aerospace components operate at the edge of what materials can endure. Turbine blades spin inside combustion environments hot enough to soften unprotected metal. Structural parts face relentless mechanical wear, corrosive exposure, and oxidation with every flight cycle. The coatings applied to these components are not for preventive maintenance, they are a core part of what makes modern aerospace engineering possible.

The Demands of Aerospace Environments

No industrial environment tests materials more rigorously than aerospace. Jet engines expose components to temperatures that exceed the thermal limits of unprotected base metals. Turbine blades and hot section parts experience continuous mechanical stress and oxidation as elevated temperatures accelerate the reaction between metal surfaces and oxygen. At the same time, the industry faces mounting regulatory pressure to move away from hard chrome plating.

Addressing these challenges requires matching the right material and process to each specific application. Aerospace coating systems are designed to address the full range of operating demands:

• Heat insulation to allow components to operate beyond their base material temperature limits
• Oxidation and corrosion protection to prevent surface degradation at high temperatures
• Wear resistance to extend the service life of mechanically active components
• REACH-compliant alternatives to hard chrome plating

Thermal Barrier Coatings for Aerospace

Thermal barrier coatings are among the most critical aerospace coatings in service today. Applied to turbine blades (buckets), vanes (nozzles), and other hot section components, these ceramic-based coatings act as thermal insulators, reducing heat transfer to the underlying metal and allowing parts to operate at temperatures that would otherwise cause softening or premature degradation. The result is improved engine efficiency, longer component life, and reduced risk of heat-related failure.

Thermal barrier coatings are typically applied using a two-layer system engineered for durability and performance. The first layer is a platinum modified aluminide coat or MCrAlY bond coat, a metallic coating that adheres to the substrate, provides a stable foundation for the topcoat, and delivers protection against oxidation and corrosion. The second layer is the ceramic thermal barrier topcoat, which provides the primary heat insulation function. Together, these layers allow components to run hotter and longer without sacrificing reliability.

Oxidation and Corrosion Protection

As operating temperatures rise, so does the rate at which oxygen or other corrosive species react with metal surfaces. Oxidation and corrosion degrade material properties, and in aerospace applications, that degradation directly affects component performance and service life.

Oxidation resistance coatings, including diffusion coatings and MCrAlY overlay coating systems, create a protective barrier between metal surfaces and the high-temperature oxidizing environment they operate in. These metallic coatings can be used a standalone coating for protection against high-temperature oxidation and corrosion attack. They can also be used as a bond coat for thermal barrier coating systems. For components that face both thermal extremes and corrosive exposure, this layered approach delivers protection from a single, integrated system.

Linde AMT also provides slurry-based SermeTel coatings to protect steel components in the compressor sections against corrosion and oxidation attacks. Cr6+-free slurry coating solutions have been developed and are available for fully REACH compliance. Improvements were also achieved to increase coating long-term operating temperature by 100°F.

Wear-Resistant Coatings and Chrome Plating Alternatives

Hard chrome plating has long been used in aerospace for wear and corrosion protection. But hexavalent chromium, the compound at the core of the process, is classified as hazardous under REACH regulations, and the industry is actively transitioning away from it.

Cobalt-based and carbide-based coatings are engineered to meet and exceed the performance of hard chrome plating without the regulatory burden. Applied via plasma and high-velocity coating processes, these cobalt and carbide-based coatings (including Tribaloy® tungsten carbide and chromium carbide) deliver measurable performance advantages:

• Wear resistance better than hard chrome plating
• Corrosion resistance across demanding operating environments
• Full REACH compliance, with cobalt-free binder alternatives available for operations anticipating further regulatory change

For aerospace manufacturers and MRO facilities transitioning away from hexavalent chromium, cobalt-based and carbide coatings offer a clear, proven path forward.

Aircraft Parts Repair and Overhaul

Aerospace coatings do not only apply to new components. When parts reach the end of their coated service life, they can often be restored rather than replaced, which is a meaningful cost advantage for aerospace operations.

Repair and overhaul services for aerospace coatings typically include stripping worn or degraded coatings, addressing underlying mechanical damage, and reapplying the appropriate coatings to restore the component to OEM specification. This capability supports the full component lifecycle, giving operators a path to extend asset value and reduce replacement costs.

Why Linde AMT for Aerospace Coatings 

What sets Linde AMT apart is the integration of capabilities that most coating providers cannot match. We develop proprietary coating chemistries in our R&D facilities, manufacture our own thermal spray powders, build the equipment used to apply them, and operate coating service plants with the expertise aerospace applications demand. This end-to-end model means that when a customer brings us a complex coating challenge, we have every resource available to solve it.

Our portfolio of over 300 coating solutions reflects more than 75 years of innovation across aerospace and adjacent industries. Whether the requirement is thermal protection for a turbine hot section, oxidation and corrosion resistance for high-temperature components, or a compliant alternative to hard chrome, we have the materials, the processes, and the expertise to deliver.

Partner With Linde AMT

Aerospace components cannot afford to fail. The coatings protecting them should be engineered with the same standard in mind. Contact Linde AMT to speak with an expert and find the right aerospace coating solution for your application.

Frequently Asked Questions

What are aerospace coatings?

Aerospace coatings are engineered surface treatments applied to aircraft and jet engine components to protect them from heat, oxidation, wear, and corrosion. They are a critical part of how modern aerospace components achieve the performance and service life demanded by their applications.

How do aerospace coatings extend component life?

By protecting base materials from heat, oxidation, corrosion, and wear, aerospace coatings allow components to maintain their mechanical integrity and surface properties for longer. This reduces replacement frequency, lowers maintenance costs, and keeps equipment operating at higher efficiency for longer periods.

Are Linde AMT aerospace coatings REACH compliant?

Yes. Linde AMT's aerospace coatings do not contain substances classified as hazardous under REACH regulations, including hexavalent chromium. Cobalt-free binder alternatives are also available for customers anticipating further regulatory change.