Browsing Mühendislik Fakültesi by Author "Okumuş, Sefer Cem"

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Al-Si/B4C composite coatings on Al-Si substrate by plasma spray technique

Sarıkaya, Özkan; Aslanlar, Salim; Okumuş, Sefer Cem (ELSEVIER SCI LTD, 2007)

Plasma-sprayed coatings of Al-Si/B4C have been prepared on Al-Si piston alloys for diesel engine motors. The Al-Si/B4C composite powders including 5-25 wt% B4C were prepared by mixing and ball-milling processes. These ...
Effect on residual stresses in plasma sprayed Al-Si/B4C composite coatings subjected to thermal shock

Sarıkaya, Özkan; Okumuş, Sefer Cem; Aslanlar, Salim (ELSEVIER SCIENCE SA, 2005)

Al-Si/B4C composite coatings were deposited on metallic substrates using an atmospheric plasma spray technique for diesel engine motor applications. The effect on residual stresses of the reinforcement particle (B4C) ...
Effects on performance of Cr2O3 layers produced on Mo/cast-iron materials

Okumuş, Sefer Cem (ELSEVIER SCIENCE SA, 2003)

The principle aim of this paper is to investigate effects on performance of protective multilayer coatings with Cr2O3/Mo/cast iron architecture in order to use in an internal combustion engines. With this regard, Cr2O3 ...
Fabrication of Mo coatings on cast-iron substrates by a plasma spray system

Okumuş, Sefer Cem (CARL HANSER VERLAG, 2003)

Molybdenum was deposited on cast-iron substrates using an air plasma spray system. The coated samples were characterized by optical microscopy, scanning electron microscopy, X-ray diffraction, image analyzing, and ...
Friction and wear properties of Mo coatings on cast-iron substrates

Okumuş, Sefer Cem (ELSEVIER SCIENCE SA, 2003)

In order to protect machining parts against wear and corrosion in automotive, aerospace, pulp and paper industries, they are coated with Mo-based materials. For these specific applications, Mo coatings were fabricated on ...
In Situ Formation of Ti-TiAl3 Metallic-Intermetallic Composite by Electric Current Activated Sintering Method

Yener, Tuba; Okumuş, Sefer Cem; Zeytin, Sakin (2015)
KEY ENGINEERING MATERIALS

Okumuş, Sefer Cem; Demirkıran, Ayşe Şükran; Bindal, Cuma; Yılmaz, Şenol (TRANS TECH PUBLICATIONS LTD, 2004)

The present work deals with applicability of the fly ash (thermal power plant waste) as a coating onto the steel substrates by means of plasma spray coating technology. Plasma sprayed fly ash coatings obtained with and ...
KEY ENGINEERING MATERIALS

Okumuş, Sefer Cem (TRANS TECH PUBLICATIONS LTD, 2004)

In this study, low pressure plasma spraying (LPPS) demonstrated as a viable technique to producing fine-grained samples from complex Mo-Si-B intermetallics. Microstructure and oxidation behavior of the coatings were studied.
Microstructural and mechanical characterization of plasma sprayed Al2O3-TiO2 composite ceramic coating on Mo/cast iron substrates

Okumuş, Sefer Cem (ELSEVIER SCIENCE BV, 2005)

The principle aim of this paper is to investigate the performance of protective multilayer coatings with Al2O3-TiO2/Mo/cast iron architecture in order to use in internal combustion engines. With this regard, alumina-titania ...
Microstructure of a Plasma Sprayed Mo–Si–B Alloy

Okumuş, Sefer Cem (2000)
Reliability of wear volume measurement approaches in relation to the effect of surface finish on friction and wear of Al2O3

Mimaroğlu, Abdullah; Yılmaz, Fevzi; Okumuş, Sefer Cem (SOC TRIBOLOGISTS & LUBRICATION ENGINEERS, 1997)

Wear measurements are notoriously variable. Even the experiments with the same type of material and test machine can give significantly different results. Such discrepancies are mostly due to a lack of adequate control of ...
Reliability of wear volume measurement approaches in relation to the effect of surface finish on friction and wear of Al2O3

Mimaroğlu, Abdullah; Yılmaz, Fevzi; Okumuş, Sefer Cem (SOC TRIBOLOGISTS & LUBRICATION ENGINEERS, 1997)

Wear measurements are notoriously variable. Even the experiments with the same type of material and test machine can give significantly different results. Such discrepancies are mostly due to a lack of adequate control of ...
Stable Crack Growth Detection by Strain–Gauge in Plasma Sprayed Chevron–Notched Fracture Toughness Specimens

Okumuş, Sefer Cem (2000)
Thermal behaviour of plasma-sprayed Mo coating on cast-iron substrate

Okumuş, Sefer Cem (ELSEVIER SCIENCE SA, 2003)

In this study, Mo coatings were fabricated on cast-iron substrate using a plasma-spray technique for diesel engine motors. In order to undergo cyclic heating because of piston element in combustion chamber, thermal behaviour ...
Thermal Expansion and Thermal Conductivity Behaviors of Al-Si/SiC/graphite Hybrid Metal Matrix Composites (MMCs)

Okumuş, Sefer Cem; Aslan, Serdar; Karslıoğlu, Ramazan; Gültekin, Deniz; Akbulut, Hatem (KAUNAS UNIV TECH, 2012)

Aluminum-silicon based hybrid composites reinforced with silicon carbide and graphite particles were prepared by liquid phase particle mixing (melt stirring) and squeeze casting. The thermal expansion and thermal conductivity ...
Wear behaviour of plasma-sprayed AlSi/B4C composite coatings

Sarıkaya, Özkan; Okumuş, Sefer Cem; Aslanlar, Salim (ELSEVIER SCI LTD, 2007)

This paper describes the wear behaviour of AlSi/B4C composite coatings with 0-25 wt% B4C particles for diesel engine motors. These coatings were successfully fabricated on AlSi substrates using an atmospheric plasma spray ...