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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2007, Volume11

164 pages

DOI: 10.1615/HighTempMatProc.v11.i3

Issue price - $168.00

OPEN POROUS METALLIC FOAMS WITH THERMAL BARRIER COATINGS AND COOLING HOLE ARRAY FOR HIGH TEMPERATURE TURBINE APPLICATIONS

S. Angel
Department of Ferrous Metallurgy, IEHK, RWTH Aachen University, Intzestr. 1, 52072 Aachen

E. Ratte
Department of Ferrous Metallurgy, IEHK, RWTH Aachen University, Intzestr. 1, 52072 Aachen

W. Bleck
Department of Ferrous Metallurgy, IEHK, RWTH Aachen University, Intzestr. 1, 52072 Aachen

K. Bobzin
Surface Engineering Institute (IOT), RWTH University of Technology Aachen, Augustinerbach 4-22, 52066 Aachen, Germany

Erick Lugscheider
Werkstoffwissenschaften Lehr und Forschungsgebeit der RWTH Jiilicher Sir. 342-352 52070 Aachen; Surface Engineering Institute (IOT), RWTH University of Technology Aachen, Augustinerbach 4-22, 52066 Aachen, Germany

R. Nickel
Surface Engineering Institute, IOT, RWTH Aachen University, Augustinerbach 4-22, 52062 Aachen, Germany

K. Richardt
Surface Engineering Institute, IOT, RWTH Aachen University, Augustinerbach 4-22, 52062 Aachen, Germany

N. Bagcivan
Surface Engineering Institute (IOT), RWTH University of Technology Aachen, Augustinerbach 4-22, 52066 Aachen, Germany

K. Walther
Chair for Laser Technology, LLT, RWTH Aachen University, Steinbachstr. 15, 52074 Aachen, Germany

E. W. Kreutz
Chair for Laser Technology, LLT, RWTH Aachen University, Steinbachstr. 15, 52074 Aachen, Germany

I. Kelbassa
Chair for Laser Technology, LLT, RWTH Aachen University, Steinbachstr. 15, 52074 Aachen, Germany

Reinhart Poprawe
Chair for Laser Technology, LLT, RWTH Aachen University, Steinbachstr. 15, 52074 Aachen, Germany

ABSTRACT

Open porous and high temperature resistant Ni-base structures are developed for the requirements of an effusion cooling. A metallic foam, that is produced by the SlipReactionFoamSintering (SRFS)- process, a powder metallurgical process, is used as the open porous structure. To withstand the high temperatures in the combustor of a gas turbine of up to 1520 °C the samples are covered with a Thermal Barrier Coating (TBC) using thermal spraying processes, which hermetically seals the open porous structures. Laser drilling is used to form blind holes through the TBC into the metallic foam in order to establish connections to a number of pores, which make the mass flow of the cooling fluid possible. Therefore, the pores must not be clogged by molten material during laser drilling. The aim of this paper is to point out the general feasibility of the production steps of the open porous multi-layer component made out of the open porous foam and the thermal barrier coating, which is then opened by laser drilling. First design suggestions are given for the foam pore structure to enable the application of the TBC and for the dimension of the laser drilled holes.