Thermisch gespritzte, keramische Zylinderlaufbahnen unter Misch‐/Grenzreibung

Abstract

Einen großen Beitrag zur Gewichtseinsparung leistet die Substitution von Grauguss‐Legierungen durch moderne Aluminiumlegierungen für Pkw Kurbelgehäuse. Zur Erhöhung der tribologischen und thermomechanischen Belastungsgrenzen von Aluminiumoberflächen kommen thermisch gespritzte Schichten in Frage. Zielsetzung nachfolgender Untersuchungen ist es außermotorisch unter Misch‐/Grenzreibung das tribologische Potenzial von thermisch gespritzten keramischen Schichtwerkstoffen auf Basis der Stoffsysteme Cr2O3, Cr2O3/TiO2, Cr3C2/NiCr, TiO2, TiO2/Al2O3 im Vergleich zu aktuell serienmäßig eingesetzten Graugusswerkstoffen zu ermitteln. Die Oberflächentopographien und die Schmierstoffe determinieren gegenüber GG26Cr die Verschleißsenkungspotenziale der keramischen Schichten. Eine Reduzierung der Reibungszahlen wird nicht durch keramische Oberflächenbeschichtungen, sondern durch den Einsatz von Polyglykolen als Schmiermedium erzielt.

Potential of thermal sprayed TinO2n‐1‐coatings for substituting molybdenum‐based ring coatings

“…The higher GG20HCN liner wear created in the BAM tribotests by the Ti n O 2 n −1 due to its higher hardness and should be managed by of smoother finishing (Woydt et al , 2004).…”

“…The tribological effect of Magnéli phases (Gardos, 2000; Woydt, 2000), the detection and effect of different Ti‐O phases, relevant phases in the Ti‐O system (Berger, 2004; Anderson and Magnéli, 1956) and tribological tests with Ti‐containing and TiO x materials is described in different publications (Woydt et al , 1999; Woydt, 2004). Different thermal spray techniques are available for the deposition of triboactive, substoichiometric TiO x , Ti n −2 Cr 2 O 2 n −1 and TiMoCN coatings (Toma et al , 2004; Flor, 2003b; Berger et al , 1998) A strong effect of phase stoichiometry on point defects, polarity and electric properties was found (Berger, 2004;Toma et al , 2004; Kernler, 1991) Particular interest is drawn on titanium oxide‐based coatings for deposition on lightweight components for surface protection, higher thermal and higher wear resistance of tribologically stressed engine components (Barbezat and Sulzer Metco, 2004; Storz et al , 2001; Storz, 2001; Woydt et al , 2004; Buchmann et al , 2002; Buchmann, 2002; Flor, 2003a, b).…”

“…Magnéli phase coatings as Ti n O 2 n −1 and (Ti,Mo)(C,N)+23NiMo with lubricious‐oxide forming capability (Skopp and Woydt, 1995; Woydt et al , 1999, 2004; Buchmann et al , 2002) were considered as promising tribomaterials. Tribotests under lubricated as well as unlubricated conditions have shown a promising high wear resistance under different tribotest conditions (Skopp and Woydt, 1995; Buchmann et al , 2002).…”

Corrosion Behaviour of a Cermet Deposited Coating in Sulfuric Acid Solution

“…These aspects led to the research and development of various techniques of increasing the wear resistance and of anticorrosive protection of materials. [4,5] A present interest method which has recorded large progress in the last years represents the coatings achieved through thermic spraying in order to protect materials against mechanical and thermal wear as well as corrosion.…”

Thermally sprayed titanium suboxide coatings for piston ring/cylinder liners under mixed lubrication and dry-running conditions

“…Therefore, low-additivated alternative engine oils [3,4] as well as triboeffective thermally sprayed ceramic coatings [5][6][7][8][9][10][11][12] are under development to reach and overcome these limits and to study their tribological potential.…”