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Development of thermal spray coating solution for ceramic substrates

: Toma, Filofteia-Laura; Berger, Lutz-Michael; Hoffmann, Thomas; Scheitz, Stefan; Thiele, Sven; Fries, Manfred

Lima, R.S. ; ASM International:
International Thermal Spray Conference & Exposition, ITSC 2013 : Innovative Coating Solutions for the Global Economy; Busan, Republic of Korea, 13 – 15 May 2013
Red Hook, NY: Curran, 2013
ISBN: 978-1-63266-681-9
International Thermal Spray Conference & Exposition (ITSC) <2013, Busan>
Conference Paper
Fraunhofer IKTS ()
Fraunhofer IWS ()
laser ablation; ceramic materials; sintering; surface property; near surface regions

For modification of their surface properties, there exists an increasing need to apply thermal spray coating solutions also on ceramic substrates. Depending on the structure and the properties of these substrates, special concepts for substrate preparation have to be developed. In this contribution, several concepts for coating deposition on sintered Si3N4 and AIN ceramics are presented. The use of conventional sandblasting resulted in low roughening and induced damage at the near-surface region of the substrate. As alternative, laser ablation was used to modify the surface properties of ceramics for thermal spraying. By appropriate selection of laser ablation parameters and spray processes, APS and suspension-HVOF Al2O3 coatings with good bonding on the ceramic substrates were successfully produced.