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Surface preparation for ceramics functionalization by thermal spraying

: Scheitz, Stefan; Toma, Filofteia-Laura; Kuntze, Thomas; Leyens, Christoph; Thiele, Sven

McDonald, A. (eds.) ; ASM International; The Thermal Spray Society -TSS-:
Thermal spray 2015. International Thermal Spray Conference ITSC 2015. Proceedings : Innovative Coating Solutions for the Global Economy; Long Beach, California, May 11 - 14, 2015
Materials Park, Ohio: ASM International, 2015
ISBN: 978-1-62708-093-4
International Thermal Spray Conference & Exposition (ITSC) <2015, Long Beach/Calif.>
Bundesministerium für Wirtschaft und Technologie BMWi
IGF; 17371BR; Cerasan
Funktionalisierung von Keramikoberflächen durch thermisch gespritzte Schichten
Conference Paper
Fraunhofer IWS ()
Fraunhofer IKTS ()

Dense sintered technical ceramics demand special surface preparation in order to be coated by thermal spraying. Sandblasting results in the damage of the interface region and leads to bonding defects. On the contrary, by varying the laser conditions, different laser structured surfaces were generated, which at Rz roughness values in the range of 40 μm, allowed to achieve thick and well bonding coatings. Therefore, laser ablation is proved to be the best method for surface preparation of ceramic substrates. In the case of porous ceramics (including pre-sintered ceramics) substrate preparation can be omitted, depending on their porosity level. Ceramics with porosity content up to 60 % can be coated by APS, whereas HVOF can be used on ceramics with porosity up to 30 %. On ready-to-get-coated pre-sintered ceramic parts (without substrate preparation), followed by co-firing of the substrates and coatings, the development of new ceramic components is possible.