Posted by Gordon England on November 11, 2003 at 12:11:31:
In Reply to: High Temperature Abradable posted by Elia Levi on November 10, 2003 at 10:05:09:
: Is there a powder capable of providing abradable thermal sprayed coating for turbine applications, for gas temperatures up to 1050 deg C?
: Thanks.
For temperatures above 900 deg C and up to 1200 deg C ceramic abradable coatings are required and are usually based on plasma sprayed YSZ (yttria stabilised zirconia)with a MCrAlY coating base. Polymer additions to the YSZ powder are used to control porosity levels which is normally burnt out by heat treatment after coating. Because of the abrasive nature of this coating, the blade tip or counter face material will also need coating with a wear resistant abrasive material that will effectively abrade the YSZ coating without wear to itself.
Regards Gordon
Follow Ups:
Please go to the new Surface Engineering Forum as this old message board is a read only archive. Please copy and paste relevant information or link to this page if you wish to reactivate this thread on the new forum.
