Franz Novotny-Farkas - Academia.edu (original) (raw)

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Papers by Franz Novotny-Farkas

Research paper thumbnail of Influence of Surface Roughness on the Tribological Behavior of Gear Oils in Steel–Steel Contacts: Part I—Boundary Friction Properties

Tribology Transactions, 2014

Influence of surface roughness on tribological and mechanical properties of micro-milled and lase... more Influence of surface roughness on tribological and mechanical properties of micro-milled and laser ablated poly (methyl methacrylate) PMMA organic glass,

Research paper thumbnail of Comparison of engine oil degradation observed in laboratory alteration and in the engine by chemometric data evaluation

Tribology International, 2013

The influence of ethanol in gasoline and its partial combustion products on the engine oil perfor... more The influence of ethanol in gasoline and its partial combustion products on the engine oil performance was investigated by joint use of IR spectroscopic data and chemometrics. Oil samples obtained from artificial alteration in the laboratory and engine alteration in a chassis dynamometer were compared. Quantification of residual amounts of antioxidant and antiwear additive (ZDDP) in the oil samples by FTIR spectroscopy showed depletion of phenolic antioxidant during engine alteration but ZDDP degradation during artificial alteration. Different chemometrical models using principal component analysis (PCA) elucidated similarities and differences between both alteration types, proving the findings of FTIR spectroscopy. Additionally, laboratory-based artificial alteration was mainly driven by oxidative processes whereas engine alteration showed higher amounts of both oxidation and nitration products.

Research paper thumbnail of Influence of Surface Roughness on the Tribological Behavior of Gear Oils in Steel–Steel Contacts: Part I—Boundary Friction Properties

Tribology Transactions, 2014

Influence of surface roughness on tribological and mechanical properties of micro-milled and lase... more Influence of surface roughness on tribological and mechanical properties of micro-milled and laser ablated poly (methyl methacrylate) PMMA organic glass,

Research paper thumbnail of Comparison of engine oil degradation observed in laboratory alteration and in the engine by chemometric data evaluation

Tribology International, 2013

The influence of ethanol in gasoline and its partial combustion products on the engine oil perfor... more The influence of ethanol in gasoline and its partial combustion products on the engine oil performance was investigated by joint use of IR spectroscopic data and chemometrics. Oil samples obtained from artificial alteration in the laboratory and engine alteration in a chassis dynamometer were compared. Quantification of residual amounts of antioxidant and antiwear additive (ZDDP) in the oil samples by FTIR spectroscopy showed depletion of phenolic antioxidant during engine alteration but ZDDP degradation during artificial alteration. Different chemometrical models using principal component analysis (PCA) elucidated similarities and differences between both alteration types, proving the findings of FTIR spectroscopy. Additionally, laboratory-based artificial alteration was mainly driven by oxidative processes whereas engine alteration showed higher amounts of both oxidation and nitration products.

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