Detailed Product Description:

Aluminum Titanium Nitride (AlTiN) is the hardest of the Physical Vapor Deposition (“PVD”) hard coatings at over 3500 Vickers (compared to Ti-Nitride’s 2300 Vickers).  

This is a relatively new coating specifically designed for use in high temperature applications.  It maintains thermal stability up to 1,650ºF compared to Ti-Nitride’s 1,050ºF.

Like Titanium Nitride, TiAlN won’t chip, peel, or flake.  Its hardness is equivalent to about

92 Rockwell C.  It has a unique bluish-green appearance.  It is self-lubricating/non-stick, wear-

resistant and chemical and corrosion resistant—you can store it in saltwater.  Depending upon mating surfaces, TiAlN has a coefficient of friction around 0.40.

Aluminum Titanium Nitride is applied in a vacuum in a plasma field and forms a metallurgical bond with the substrate.  Typical applied film thickness ranges from 3 to 6 microns.  Inherent in the process is coating thickness uniformity.  No buildup occurs in corners yet the coating throws well into complex geometric features.

Key Features/Benefits:

Resistant to nearly all chemicals (acids, bases, solvents, saltwater, etc.)

Temperature resistant—stable up to 1,650ºF 

Specifications:

Surface Micro-Hardness:                                    3,500 Vickers (equivalent to about 92Rc)

Coefficient of Thermal Expansion:                    9.4 ppm/ºC  (9.4 microinches/inch/ºC)

Thermal Conductivity:                                        0.046 Calories/second-cm-ºC

Density:                                                                 5.22 grams/cm3

Crystalline Structure:                                           Face centered cubic

Modulus of Elasticity:                                         600 GigaPascals

Coating Thickness:                                              5 microns typical (range from 0.25 up to 12 microns)

Deposition Temperature:                                    800ºF to 850ºF

Electrical Resistivity:                                           25 micro-Ohm-cm

Substrate Selection:

PVD coatings are applied to many different materials.  Materials coated include most metals, ceramics, and some plastics.  Substrates must be compatible with a high vacuum environment and must be able to withstand the deposition temperatures of the process. 

The most common materials successfully coated with Aluminum-TiN are the tool steels, stainless steel, mild steel, titanium alloys, carbides, Inconel, Hastelloy, the copper alloys and the aluminum alloys.

Avoid metals containing significant amounts of Cadmium (Cd), Tin (Sn) or Lead (Pb) and materials that can outgas in the vacuum chamber. Assemblies and press fit parts can also create an out-gassing situation. 

Substrate Preparation:

Proper adhesion of the coating requires a pristine surface of the part.  The surface must be free of paint, glue, rust, oxidation, etc.  Grit blasting after heat treating and before finish grinding has been found the best approach.  Areas that are not important for coating still must not have a contaminant on the surface that could outgas, as this material will migrate throughout the chamber and contaminate all of the coating.

We clean the parts immediately before coating them.  They should be ready for coating, and cleaned of foreign material, then coated with a light rust-preventive oil for shipment to us.  Parts that do not require oil may be wrapped in a suitable material to prevent contamination and/or prevent oxide buildup.

Coating Services:

Please contact our Technical Support department via phone or e-mail to discuss your needs and to obtain a quotation.  Pricing is based on minimum lot charge.  Thus piece part cost is dependent upon size and quantity per lot.