Abradable coating

An abradable coating is a coating made of an abradable material – meaning if it rubs against a more abrasive material in motion, the former will be worn whereas the latter will face no wear.

Abradable coatings are used in aircraft jet engines in the compressor and turbine sections where a minimal clearance is needed between the blade tips and the casing.

Abradable Powder Coatings provide an economical and environmentally friendly way to improve the efficiency of engines, compressors and pumps by fine-tuning the operational fit of internal components such as pistons, rotors and cases. In typical turbo machinery, the clearance between blade tips and the casing must account for thermal and inertial expansion as well as changes in concentricity due to shock loading events. To prevent catastrophic tip to casing contact, conservatively large clearances must be employed.

The role of abradable coatings is not only to allow for closer clearances, but to automatically adjust clearances, in-situ, to accept physical events and/or thermal scenarios that may be found in a devices operational history.

Manufacturing
  • Thermal spray: Many techniques are available (Plasma, Flame, etc.).
  • Sintering: Honeycomb coatings are sintered on the casing
  • Casting: in the case of polymer coating.
gollark: 690 LINES?!
gollark: I mean, yes, they're not the same thing, but overlap.
gollark: I'm not sure if we need CS *and* programming.
gollark: You cannot """""merge channels", this is impossible.
gollark: Where did they get "C evaluates code right to left" from?
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.