Aluminum Titanium Nitride (AlTiN) or Titanium Aluminum Nitride (TiAlN) is a thin film coating that was developed from Titanium Nitride. TiAlN offers higher temperature resistance than TiN, as well as slightly higher hardness and especially higher hot hardness (i.e. the hardness at high temperatures). It is primarily used in high temperature environments above the limits of TiN usage.
This coating works by forming a thin surface layer of Alumina (Al2O3), or Aluminum Oxide ceramic. As the layer wears it continuously reforms. But, the coating must run in hot conditions for this process to occur.
Aluminum Titanium Nitride (AlTiN or TiAlN) Coating
- Hard (harder than TiN, harder than carbide, 3X hard chrome)
- Enhanced temperature capability
- Extremely high hot hardness
- Strong adhesion—molecular bond to substrate metal.
- Broad range of substrates
- Thin film typically 3 µm (0.000118”)thick
- Uniform coating with no buildup on edges
- Follows surface texture of the part.
- Dark grayish metal appearance
- Environmentally friendly process
Use AlTiN for:
- High temperature applications
- Holds sharp edges or corners
- Abrasion and erosion resistance
- Enhances corrosion resistance but does not perfectly encapsulate the part
- Little dimensional impact, perfect for close tolerance parts
AlTiN Coatings General Information
- Can withstand elevated temperatures up to 800°C (1450°F) in air.
- Forms a thin surface layer of Al2O3 that is hard, low in friction and oxidation resistant. As this layer wears, it is constantly rebuilt from the Al in the coating.
- Performs best in high temperature applications. Requires high temperatures to form the Al2O3 surface layer.
- Harder than TiN. But, does not outperform TiN in all applications.
- Less universal than TiN.
- Is not a single material. No AlTiN molecule exists. Rather it is a complex structure consisting of TiN and AlN bonds in a crystalline matrix. AlTiN or TiAlN is a proprietary multilayered or graded architecture design.
- No uniform specification exists for a AlTiN or TiAlN material.
- Custom designs are possible.
- Can be applied to most metals to provide enhanced surface characteristics, and can also be applied to some ceramics and plastics
- Is harder than carbide and chrome, off the Rockwell C scale.
- Is dense and non-porous
- Tools typically last 3 to 10 times longer than uncoated tools.
- Is typically 3 micrometers or .0001” thick
- Has a uniform thickness that follows the contour of the part’s surface
- Forms an outstanding bond to the base material that will not blister, flake or chip
- Thin film coating applied by environmentally safe, Physical Vapor Deposition (PVD) vacuum system
- Check out these helpful resources:
- PVD Process Description
- Guide to Substrate Preparation for thin film coatings
- Thickness Conversion Chart
- Temperature Conversion Chart