SAE AMS5850E-2025 PDF

Full title and description

SAE AMS5850E-2025 — Aerospace Material Specification for High-Temperature, Oxidation-Resistant Coatings (E-class revision, 2025). This specification defines requirements, processing controls, inspection criteria, and test methods for metallic and ceramic thermal/environmental barrier coatings and oxidation-resistant overlays used on aerospace gas turbine engine components to protect against high-temperature corrosion, oxidation, and thermal degradation.

Abstract

This AMS standard (designation AMS5850E-2025) establishes performance, material composition, application processes, quality assurance, and acceptance test methods for high-temperature oxidation-resistant and environmental barrier coatings used in aerospace gas turbine engines and related components. It covers coating system types, substrate preparation, application techniques (such as physical vapor deposition, chemical vapor deposition, thermal spray, and pack cementation where applicable), heat treatments, bond strength, cyclic oxidation testing, and allowable defects. The revision 'E' incorporates updated test methods and tighter process controls to reflect advances in coating technologies and industry experience through 2025.

General information

• Status: Active (E revision, 2025)
• Publication date: 2025 (AMS5850E)
• Publisher: SAE International (Aerospace Standards)
• ICS / categories: 49.020.40 (Aeronautics and astronautics engineering); Aerospace materials and processes
• Edition / version: Revision E (2025)
• Number of pages: Typically 30–60 pages (exact page count varies by printed format)

Scope

This specification applies to the procurement, application, inspection, and testing of oxidation-resistant and environmental barrier coatings intended for high-temperature service on turbine engine hot-section components and other aerospace parts exposed to oxidizing and corrosive atmospheres. It defines coating types and classes, substrate surface preparation requirements, allowable coating thickness ranges and tolerances, bonding and adhesion criteria, pre- and post-coating heat treatments, nondestructive and destructive examination methods, and required qualification testing for coating processes and suppliers.

Key topics and requirements

• Classification of coating types and system descriptions (metallic overlays, MCrAlY, aluminide, diffusion coatings, ceramic thermal/environmental barrier coatings)
• Substrate preparation: blasting media, cleanliness, and surface roughness requirements
• Application processes and controls: PVD, CVD, plasma spray, HVOF, pack cementation, and process parameter documentation
• Heat treatment and diffusion cycles required for overlay and diffusion coatings
• Coating thickness, porosity, and allowable defect limits with measurement methods
• Bond strength and adhesion testing, including pull-off and bend tests
• Cyclic oxidation, hot corrosion, and thermal cycling test methods and acceptance criteria
• Nondestructive inspection: visual, eddy current, fluorescent penetrant, and microscopy requirements
• Supplier qualification, process change control, and traceability documentation

Typical use and users

This standard is used by aerospace OEMs, turbine engine manufacturers, repair and overhaul facilities, coating suppliers, quality and materials engineers, procurement specialists, and certification authorities. It supports specification and procurement of coated parts, qualification of coating processes and suppliers, acceptance of repaired or newly coated components, and development of coating process controls in production and MRO environments.

Related standards

Commonly referenced and related documents include other AMS and SAE aerospace coating and surface preparation specifications, industry test methods for corrosion and oxidation, and ASTM and ISO test standards for coating characterization and nondestructive inspection. Related standards often cited alongside this specification cover thermal spray processes, metallurgical analyses, and engine material specifications for superalloys and substrates.

Keywords

AMS5850E, oxidation-resistant coating, environmental barrier coating, thermal barrier, MCrAlY, aluminide, diffusion coating, PVD, CVD, thermal spray, HVOF, cyclic oxidation, hot corrosion, aerospace coating specification, turbine engine coatings, MRO, supplier qualification

FAQ

Q: What is this standard?

A: AMS5850E-2025 is an SAE Aerospace Material Specification defining requirements for high-temperature oxidation-resistant and environmental barrier coatings used on aerospace gas turbine engine components; it covers materials, processes, testing, and acceptance criteria.

Q: What does it cover?

A: It covers coating system classifications, substrate preparation, application methods (PVD, CVD, thermal spray, pack cementation where applicable), heat treatments, thickness and defect limits, adhesion and cyclic oxidation testing, nondestructive inspection, and supplier/process qualification.

Q: Who typically uses it?

A: Aerospace OEMs, engine manufacturers, coating suppliers, MRO shops, materials and quality engineers, procurement teams, and certification bodies use it to specify and accept coated components and to qualify coating processes.

Q: Is it current or superseded?

A: The document is presented as Revision E issued in 2025 and should be considered the current revision until a later revision is released; users should confirm status with SAE or their procurement documents for the latest revision.

Q: Is it part of a series?

A: Yes. AMS5850E relates to a family of AMS and aerospace specifications covering coatings, surface preparation, and material treatments for aero-engines and airframe components; it is typically used alongside other AMS coating and material standards.

Q: What are the key keywords?

A: Oxidation-resistant coating, environmental barrier coating, thermal spray, MCrAlY, aluminide, PVD, CVD, cyclic oxidation, aerospace, turbine engine, AMS5850E.