The Effect of Laser Glazing on High Temperature Oxidation Resistance of Thermal Barrier Coatings


DİLTEMİZ S. F. , KUŞHAN M. C.

International Conference on Materials Science and Information Technology (MSIT 2011), Singapore, Singapore, 16 - 18 September 2011, pp.315-316 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.4028/www.scientific.net/amr.433-440.315
  • City: Singapore
  • Country: Singapore
  • Page Numbers: pp.315-316
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

Thermal barrier coatings (TBCs) have been widely used by aero and land based gas turbines to protect hot section parts from oxidation and thermal loads. These coatings are generally consisting of multiple layers of coating (usually two) with each layer having a specific function. TBCs are generally deposited with air plasma spray (APS) or electron beam physical vapor deposition (EB-PVD) techniques. In this paper plasma sprayed TBCs were deposited on to 304 stainless steel substrates then ceramic surfaces were glazing with Nd-YAG laser. Metallographic examinations were applied to the samples to investigate microstructural changes in glazed ceramic layer. Both glazed and as-coated samples were subjected to oxidation tests to measure the high temperature oxidation resistance. The tests showed that, laser glazing is beneficial to oxidation resistance of TBCs. This improvement is attributed to sintering of zirconia layer which act as oxygen barrier and formed during glazing process.