Microholes in zirconia-coated Ni-superalloys for transpiration cooling of turbine blades

Alexander Horn; Ruth Weichenhain; S. Albrecht; Ernst-Wolfgang Kreutz; Jan Michel; Markus Niessen; Vadim Kostrykin; Wolfgang Schulz; A. Etzkorn; K. Bobzin; E. Lugscheider; Reinhart Poprawe

doi:10.1117/12.407331

16 August 2000 Microholes in zirconia-coated Ni-superalloys for transpiration cooling of turbine blades

Alexander Horn, Ruth Weichenhain, S. Albrecht, Ernst-Wolfgang Kreutz, Jan Michel, Markus Niessen, Vadim Kostrykin, Wolfgang Schulz, A. Etzkorn, K. Bobzin, E. Lugscheider, Reinhart Poprawe

Author Affiliations +

Proceedings Volume 4065, High-Power Laser Ablation III; (2000) https://doi.org/10.1117/12.407331
Event: High-Power Laser Ablation, 2000, Santa Fe, NM, United States

Abstract

Drillings in zirconia coated Ni-superalloys is done by melt extraction with pulsed laser radiation provided by a Nd:YAG slab laser with microsecond pulse duration. This laser system distinguishes itself by a high beam quality and offers the possibility to investigate drilling of holes with a diameter of 200 micrometer by percussion drilling and trepanning. The quality of drilled holes, e.g. the heat affected zone (HAZ), the recast layer and the conicality, are presented. During drilling different process gases are used. The results in drilling velocities, melt thickness and chemical composition of the melting zone are shown for oxygen, argon and nitrogen by SEM and EDX. A numerical simulation of the trepanning process will be presented. The different time scales of the contributing physical processes related, for example, to the small melt film layer during trepanning are described. A coating is distributed on the multilayer system to protect the blade from recast. Aim of the investigation is the production of holes in a multilayer system, consisting of CMSX-4, VPS-MCrAlY and EB-PVD-zirconia. With this used laser system inclined holes up to 60 degrees in this layer system can be drilled. No recast layer and no spalling of the zirconia-layer are observed.

Citation Download Citation

Alexander Horn, Ruth Weichenhain, S. Albrecht, Ernst-Wolfgang Kreutz, Jan Michel, Markus Niessen, Vadim Kostrykin, Wolfgang Schulz, A. Etzkorn, K. Bobzin, E. Lugscheider, and Reinhart Poprawe "Microholes in zirconia-coated Ni-superalloys for transpiration cooling of turbine blades", Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); https://doi.org/10.1117/12.407331

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available