Aluminum Silicon Hexagonal Boron Nitride Abradable
Metco™ 320NS is an aluminum silicon alloy powders composited with hexagonal boron nitride. They are designed for
use as abradable coating materials in clearance control systems. They have been approved as a high temperature compressor abradable for various engines, replacing other
abradable materials for service temperatures up to 450 °C
(842 °F). Coatings of Metco 320NS offer improved corrosion
resistance, particularly in marine environments. They employ
hexagonal boron nitride as a lubricant, which is more inert
than other abradable lubricants such as graphite.
Hexagonal boron nitride (hBN) is a very inert lubricant that
improves abradability by reducing frictional heating on
contact with the blade at high translational speeds. It also
helps weaken the interparticle bond strength within the
aluminum silicon matrix for better friability
Typical Uses and Applications:
- High pressure compressor seal applications with service
temperatures up to 450 °C (842 °F)
- Gas turbine engine labyrinth air seals, axial and radial
compressor seals, turbocharger housing throat areas
- Depending on the application, coatings are run against
untipped titanium, steel or nickel blades
