In Situ Optical Tribometry Studies of Nanocomposite Coatings

2005 ◽  
Vol 890 ◽  
Author(s):  
Richard R. Chromik ◽  
Colin C. Baker ◽  
Andrey A. Voevodin ◽  
Kathryn J. Wahl
Keyword(s):  
Transfer Film ◽  
Yttria Stabilized Zirconia ◽  
The Other ◽  
Nanocomposite Coatings ◽  
Film Material ◽  
Stabilized Zirconia ◽  
Test Environment ◽  
Coating Composition ◽  
Coating Hardness

ABSTRACTSix nanocomposite coatings of yttria-stabilized zirconia (YSZ), Au, diamond like carbon and MoS2 have been studied by in situ tribometry. The coatings all had a nominal MoS2 content of between 14 and 18 mol%, while the concentrations of the other components were varied. Steady state friction coefficients in both dry (0.04–0.05) and wet sliding conditions (0.06–0.08) were similar for all coatings. However, by in situ tribometry, wear mechanisms were found to differ depending on coating composition and test environment humidity. Friction spiking in high YSZ coatings was identified with local plowing and scoring of the track followed by an extrusion of transfer film material. Trends in coating hardness and modulus are correlated to composition and coating wear processes.

scholarly journals Coupling between creep and redox behavior in nickel - yttria stabilized zirconia observed in-situ by monochromatic neutron imaging

2017 ◽  
Vol 340 ◽  
pp. 167-175 ◽  
Author(s):  
Malgorzata Grazyna Makowska ◽  
Luise Theil Kuhn ◽  
Henrik Lund Frandsen ◽  
Erik Mejdal Lauridsen ◽  
Salvatore De Angelis ◽  
...  
Keyword(s):  
Neutron Imaging ◽  
Yttria Stabilized Zirconia ◽  
Redox Behavior ◽  
Stabilized Zirconia

Running-in behaviour of thermal barrier coatings in the combustion chamber of a diesel engine

2019 ◽  
Vol 234 (1) ◽  
pp. 172-182 ◽  
Author(s):  
Anders Thibblin ◽  
Siamak Kianzad ◽  
Stefan Jonsson ◽  
Ulf Olofsson
Keyword(s):  
Heat Flux ◽  
Diesel Engine ◽  
Thermal Barrier Coatings ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Heavy Duty ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Heavy Duty Diesel

Thermal barrier coatings have the potential to improve the fuel efficiency of heavy-duty diesel engines by reducing heat losses. A method for in-situ measurement of heat flux from the combustion chamber of a heavy-duty diesel engine has been developed and was used to study the running-in behaviour of different thermal barrier coating materials and types of microstructures. The in-situ measurements show that the initial heat flux was reduced by up to 4.7% for all investigated thermal barrier coatings compared to a steel reference, except for an yttria-stabilized zirconia coating with sealed pores that had an increase of 12.0% in heat flux. Gd2Zr2O7 had the lowest initial value for heat flux. However, running-in shows the lowest values for yttria-stabilized zirconia after 2–3 h. Potential spallation problems were observed for Gd2Zr2O7 and La2Zr2O7.

Role of the First Atomic Layers in Epitaxial Relationship and Interface Characteristics of SrTiO3 Films on CeO2/YSZ/Si(001)

2002 ◽  
Vol 747 ◽  
Author(s):  
Tomoaki Yamada ◽  
Takanori Kiguchi ◽  
Naoki Wakiya ◽  
Kazuo Shinozaki ◽  
Nobuyasu Mizutani
Keyword(s):  
Atomic Layer ◽  
Yttria Stabilized Zirconia ◽  
The Other ◽  
Stabilized Zirconia ◽  
Epitaxial Relationship ◽  
Electron Traps ◽  
Ion Drift ◽  
Interface Characteristics ◽  
Injection Type

ABSTRACTThe role of the first atomic layers in epitaxial relationship and interface characteristics of SrTiO3 films on CeO2/yttria-stabilized zirconia (YSZ)/Si(001) substrates was investigated. Although SrTiO3 film deposited on CeO2/YSZ/Si directly was preferentially (110)-oriented, epitaxial SrTiO3(001) films could be grown on CeO2/YSZ/Si by controlling first atomic layer of the films. In the case of SrTiO3 film starting from TiO2 layer, the neither ion drift nor charge injection occurred in the SrTiO3/CeO2 interface. On the other hand, for the film starting from SrO layer, an injection-type hysteresis was observed. This is probably due to the electron traps in the interface.

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