Browsing by Author "Buytoz, Soner"

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Effect on microstructure of TiO2 rate in Al2O3-TiO2 composite coating produced by plasma spray method
(ptoelectronics and Advanced Materials – Rapid Communications, Volume: 6, No: 9-10, 2012, p. 844-849., 2012) Islak, Serkan; Buytoz, Soner; Ersöz, Emine; Orhan, Nuri; Stokes, Joseph; Somunkıran, İlyas
In this study, Al2O3-TiO2 composite coatings were thermally sprayed on the SAE 1040 steel using atmospheric plasma spray (APS) process of mixed different rates micron–sized TiO2 and micron-sized Al2O3 powders. The effects of TiO2 addition on the microstructure, phase compositions and microhardness of the coatings were investigated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and microhardness tester. The results show that the Al2O3-TiO2 composite coatings consists of both fully melted regions and partially melted regions, and the fully melted region has a lamellar-like structure. Phase transformations from mainly stable α-Al2O3 and anatase-TiO2 in the powders to predominant metastable γ-Al2O3, rutile-TiO2 and Al2TiO5 phase in the Al2O3-TiO2 composite coatings were observed. It was determined that the pore content decreased with the increased in the TiO2 powder rate. The microhardness of the coating layers was 3-4.5 times higher than substrate material. The average microhardness values of the coatings were found to reach 650-860 HV.
Effect on microstructure of TiO2 rate in Al2O3-TiO2 composite coating produced by plasma spray method
(ptoelectronics and Advanced Materials – Rapid Communications, Volume: 6, No: 9-10, 2012, p. 844-849., 2012) Islak, Serkan; Buytoz, Soner; Ersöz, Emine; Orhan, Nuri; Stokes, Joseph; Somunkıran, İlyas
In this study, Al2O3-TiO2 composite coatings were thermally sprayed on the SAE 1040 steel using atmospheric plasma spray (APS) process of mixed different rates micron–sized TiO2 and micron-sized Al2O3 powders. The effects of TiO2 addition on the microstructure, phase compositions and microhardness of the coatings were investigated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and microhardness tester. The results show that the Al2O3-TiO2 composite coatings consists of both fully melted regions and partially melted regions, and the fully melted region has a lamellar-like structure. Phase transformations from mainly stable α-Al2O3 and anatase-TiO2 in the powders to predominant metastable γ-Al2O3, rutile-TiO2 and Al2TiO5 phase in the Al2O3-TiO2 composite coatings were observed. It was determined that the pore content decreased with the increased in the TiO2 powder rate. The microhardness of the coating layers was 3-4.5 times higher than substrate material. The average microhardness values of the coatings were found to reach 650-860 HV.
FeW -SiC Esaslı Kompozit Kaplamaların Mikro Yapı ve Aşınma özellikleri
(International Advanced Technologies Symposium (IATS’11), 16-18 May 2011, Elazığ, Turkey, 2011) Eski, Özkan; Islak, Serkan; Buytoz, Soner
In this paper, FeW+SiC based metal matrix composite (MMC) coating layer on the AISI 304 stainless steel were formed by gas tungsten arc (GTA) weld process. Rate of SiC in the produced coating was changed as 10, 25 and 50 wt. % in order to investigate the effect of silicon carbide (SiC) on the microstructure, hardness and abrasive wear properties. Optical microscope (OM), scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometer (EDS) and X-ray diffraction (XRD) were employed for studying the microstructure and elemental analysis of the coatings. Optical and SEM observations showed that coating layer was uniformly bonded to substrate. The formation of Fe2C, Cr7C3 , W2C carbides ve Fe2Si, CrSi2 silicides has been determined in the microstructure. It was concluded that FeW-25 % SiC composite coating was the most suitable combination as a result of the study on the properties of hardness and wear performance.
Microstructural and wear properties of FeW-SiC based composite coatings produced by tungsten inert gas (TIG) surfacing process
(Optoelectronics and Advanced Materials – Rapid Communications, Volume: 5, No: 6, 2011, p. 65-72, 2011) Islak, Serkan; Eski, Özkan; Buytoz, Soner
In this study, SiC reinforced and FeW based metal matrix composite (MMC) was produced on substrate of AISI 304 stainless steel using tungsten inert gas (TIG) surfacing process. In order to examine the effect of SiC on microstructure, hardness and abrasive wear properties inside FeW matrix, SiC was changed by ratios of 10, 25, and 50% by weight. Phase compound and microstructure of coating layers were examined using X-ray diffractometer (XRD) and scanning electron microscope (SEM). Wear behaviours of samples were evaluated using pin-on disc sliding wear tests. It was found that Fe2C, Cr7C3, W2C carbide and Fe2Si, CrSi2 silica were formed in the microstructure. The studies conducted concluded that FeW-25 wt. % SiC composite coating was the most appropriate combination in terms of hardness and wear performance.
Microstructural andWear Characteristics of High Velocity Oxygen Fuel (HVOF) Sprayed NiCrBSi–SiC Composite Coating on SAE 1030 Steel
(Arabian Journal for Science and Engineering, 2011) Buytoz, Soner; Ulutan, Mustafa; Islak, Serkan; Kurt, Bülent; Çelik, O. Nuri
In this paper, wear properties of NiCrBSi–SiC coatings were investigated using the ball-on-disk wear test. In experimental study, NiCrBSi–SiC powders were sprayed using a high-velocity oxygen fuel technique on an SAE 1030 steel substrate. Powder mixtures with different weight mixing ratios, NiCrBSi + 10 wt% SiC, NiCrBSi + 20 wt% SiC and NiCrBSi + 40 wt% SiC coatings were prepared. The deposited coatings are compared in terms of their phase composition, microstructure and hardness. It is proved that the degree of mixing of the NiCrBSi and SiC components in the powder has a massive effect on the phase composition, microstructure and hardness of the coatings.Wear tests were conducted on both the uncoated and coated substrates at same normal load, speed, and wear distance. It has been determined that the coated substrates exhibit a very good tribological performance in comparison to the uncoated substrate. The increase in the adhesive wear resistance provided by the coating has been attributed to the presence of a large amount of dispersed Ni and Cr carbide and/or borides in the Ni matrix.
Microstructural Characteristics of High Velocity Oxygen Fuel (HVOF) sprayed NiCrBSi-SiC Composite Coating on a Low Alloy Steel
(6th International Advanced Technologies Symposium (IATS’11), 16-18 May 2011, 13-21, Elazığ,, 2011) Islak, Serkan; Buytoz, Soner; Kurt, Bülent
In this study, NiCrBSi-SiC powders were sprayed using a high velocity oxygen fuel technique on AISI 1030 steel substrate. Powder mixtures with different weight mixing ratios, NiCrBSi+10 wt.% SiC, NiCrBSi+20 wt.% SiC and NiCrBSi+40 wt.% SiC coatings were prepared. The deposited coatings are compared in terms of their phase composition, microstructure and hardness. It is proved that the degree of mixing of the NiCrBSi and SiC components in the powder has massive effect on the phase composition, microstructure and hardness of the coatings. The structure and morphologies of Ni-based coatings were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) and optical microscope (OM). Microstructures of the coatings have been revealed to the presence of a large amount of dispersed Ni and Cr carbide and/or borides in the Ni matrix. Microhardness of the coatings is found to in the range of 550–830 Hv, which is higher than the substrate material
Microstructure and microhardness characterization of Cr3C2-SiC Coatings Produced Using the Plasma Transferred Arc Metho
(MP-Materials Testing-Materials and Components Technology and Application, 54 (11-12), pp. 793-799, 2012, 2012) Islak, Serkan; Eski, Özkan; Buytoz, Soner; Karagöz, Muzaffer; Stokes, Joseph; Ireland, Dublin
Microstructure and microhardness characterization of Cr3C2-SiC Coatings Produced Using the Plasma Transferred Arc Methot
(MP-Materials Testing-Materials and Components Technology and Application, 54 (11-12), pp. 793-799, 2012, 2012) Islak, Serkan; Eski, Özkan; Buytoz, Soner; Karagöz, Muzaffer; Stokes, Joseph; Ireland, Dublin
Plazma Püskürtme Yöntemiyle AISI 304 Paslanmaz Çelik Yüzeyinde Elde Edilen ZrO2 / Al2O3- % 13TiO2 Kompozit Kaplamasının Mikroyapı Özellikleri
(6th International Advanced Technologies Symposium (IATS’11), 16-18 May 2011, Elazığ, 2011) Islak, Serkan; Buytoz, Soner
In this study, ZrO2 /Al2O3 -13 % TiO2 composite coatings that various proportions of Al2O3 -13 wt. % TiO2 were reinforced into ZrO2 matrix powder were formed on the AISI 304 stainless steel surface by plasma spray. Microstructure and phase composition of coatings was determined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. Lamellae and porous microstructures were obtained in the coatings. In addition, a small amount of unmelted particles, partially melted and fully melted regions in microstructure of coatings were observed. With the increasing addition of Al2O3 - TiO2 , a decrease in the pores was observed. XRD analysis results showed the formation of ZrO2 , Al0.52Zr0.48O1.74, ZrTiO4 , Al0.18Zr0.82O1.91, Al2O3 , Al2Zr3 , Al3Ti and Ti2O3 phases in the coating layer. In compare to the substrate, microhardness of coating layer is 4-5 times more. Maximum
PLAZMA PÜSKÜRTME YÖNTEMİYLE OLUŞTURULAN AL2O3- TİO2 KOMPOZİT KAPLAMALARIN MİKROYAPI KARAKTERİSTİKLERİ
(International Iron & Steel Symposium, 02-04 April 2012, Karabük, Türkiye, 2012) Buytoz, Soner; Ersöz, Emine; Islak, Serkan; Orhan, Nuri; Kurt, Bülent; Somunkıran, İlyas
Yapılan çalışmada, SAE 1040 çeliğine plazma püskürtme yöntemiyle, Al2O3 tozu ve değişen oranlarda TiO2 tozu ilave edilerek Al2O3/TiO2 kompozit kaplamaları oluşturuldu. Elde edilen kaplama tabakalarının metalografi incelemeleri neticesinde lamelli bir mikroyapı içerisinde az miktarda ergimemiş partiküller, kısmi ergimiş ve tamamen ergimiş bölgeler gözlendi. Al2O3-TiO2 kompozit kaplamalarında TiO2 toz miktarının artmasına karşı gözenek miktarının azaldığı tespit edildi. XRD analizi sonuçları, kaplama tabakasında γ -Al2O3, α-Al2O3, Al2TiO5, ve TiO2 (rutil) fazlarının oluştuğunu göstermiştir. Kaplama tabakasının mikrosertliği alt malzemeye göre 3-4.5 kat daha fazladır. Kaplama tabakalarının ortalama mikrosertlik değerleri 650-850 HV arasında değişmiştir. In this study, Al2O3-TiO2 composite coatings were thermally sprayed on the SAE 1040 steel using atmospheric plasma spray (APS) process of mixed different rates of micron–sized TiO2 and micron-sized Al2O3 powders. The effects of TiO2 addition on the microstructure, phase compositions and microhardness of the coatings were investigated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and microhardness tester. The results show that the Al2O3-TiO2 composite coatings consist of both fully melted regions, partially melted regions, and the unmelted particles in regions of lamellar-like structure. Phase transformations from mainly stable α-Al2O3 and anatase-TiO2 in the powders to predominant metastable γ-Al2O3, rutile-TiO2 and Al2TiO5 phase in the Al2O3-TiO2 composite coatings were observed. It was idendified that the pore content was decreased with increase of TiO2 powder ratio. The microhardnesses of the coating layers were found to be 3-4.5 times higher than that of substrate material. The average microhardness values of the coatings were changed as 650-860 HV.
PLAZMA PÜSKÜRTME YÖNTEMİYLE OLUŞTURULAN AL2O3- TİO2 KOMPOZİT KAPLAMALARIN MİKROYAPI KARAKTERİSTİKLERİ
(International Iron & Steel Symposium, 02-04 April 2012, Karabük, Türkiye, 2012) Buytoz, Soner; Ersöz, Emine; Islak, Serkan; Orhan, Nuri; Kurt, Bülent; Somunkıran, İlyas
Yapılan çalışmada, SAE 1040 çeliğine plazma püskürtme yöntemiyle, Al2O3 tozu ve değişen oranlarda TiO2 tozu ilave edilerek Al2O3/TiO2 kompozit kaplamaları oluşturuldu. Elde edilen kaplama tabakalarının metalografi incelemeleri neticesinde lamelli bir mikroyapı içerisinde az miktarda ergimemiş partiküller, kısmi ergimiş ve tamamen ergimiş bölgeler gözlendi. Al2O3-TiO2 kompozit kaplamalarında TiO2 toz miktarının artmasına karşı gözenek miktarının azaldığı tespit edildi. XRD analizi sonuçları, kaplama tabakasında γ -Al2O3, α-Al2O3, Al2TiO5, ve TiO2 (rutil) fazlarının oluştuğunu göstermiştir. Kaplama tabakasının mikrosertliği alt malzemeye göre 3-4.5 kat daha fazladır. Kaplama tabakalarının ortalama mikrosertlik değerleri 650-850 HV arasında değişmiştir.In this study, Al2O3-TiO2 composite coatings were thermally sprayed on the SAE 1040 steel using atmospheric plasma spray (APS) process of mixed different rates of micron–sized TiO2 and micron-sized Al2O3 powders. The effects of TiO2 addition on the microstructure, phase compositions and microhardness of the coatings were investigated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and microhardness tester. The results show that the Al2O3-TiO2 composite coatings consist of both fully melted regions, partially melted regions, and the unmelted particles in regions of lamellar-like structure. Phase transformations from mainly stable α-Al2O3 and anatase-TiO2 in the powders to predominant metastable γ-Al2O3, rutile-TiO2 and Al2TiO5 phase in the Al2O3-TiO2 composite coatings were observed. It was idendified that the pore content was decreased with increase of TiO2 powder ratio. The microhardnesses of the coating layers were found to be 3-4.5 times higher than that of substrate material. The average microhardness values of the coatings were changed as 650-860 HV.
PLAZMA TRANSFERLİ ARK KAYNAK YÜZEY İŞLEMİYLE AISI 304 PASLANMAZ ÇELİK YÜZEYİNE WC-Ni-B4C KOMPOZİT KAPLAMASININ MİKROYAPISAL KARAKTERİSTİĞİ
(e-Journal of New World Sciences Academy 2010, Volume: 5, Number: 1, Article Number: 1A0063, 2010) Buytoz, Soner; Ulutan, Mustafa; Kurt, Bülent; Islak, Serkan; Somunkıran, İlyas
Bu çalışmada, AISI 304 paslanmaz çelik yüzeyine B4C-Ni-WC karbür ve element tozlar plazma transferli ark kaynak kaplama yöntemiyle alaşımlandırılmıştır. Kaplama tabakası; optik mikroskop (OM), taramalı elektron mikroskobu (SEM), X-ışın difraktogramı (XRD) ve X ışını enerji dağılım spektrometresinden (EDS) faydalanılarak incelenmiştir. Optik mikroskop ve mikroyapı incelemeleri neticesinde, kaplama tabakası ile alt tabakanın birbirlerine metalurjik olarak bağlandığı ve yapıda ostenit (), (Cr,W)2B, Fe23(C,B)6, Cr7C3 ile Ni4B3 faz ve karbürleri belirlenmiştir. Kaplama tabakasının adhezyon aşınma direnci, yapıda mevcut karbür ve fazlardan dolayı, alt tabakaya göre oldukça yüksek değerde olduğu tespit edilmiştir. In this study, B4C-Ni-WC powder was been alloyed on the 304 stainless steel surface by using plasma transfered arc (PTA) weld surfacing process. Alloyed layer and interface were examined with optical microscope (OM), scanning electron microscope (SEM), and X-Ray diffraction (XRD) and energy dispersive spectograph. OM and SEM observations have been shown that the obtained coating had a smooth and uniform surface, as well as a metallurgical combination with the AISI 304 stainless steel substrate without cracks and pores at the interface. The austenite (), (Cr,W)2B, Fe23(C,B)6, Cr7C3 and Ni4B3 phase and carbides have been determined in the microstructure. The adhesive wear resistance of the coating layer is higher than the AISI 304 stainless steel substrate material due to the forming of hard carbides.
PTA İLE ÜRETİLEN Cr3C2+SiC-ESASLI KAPLAMALARIN MİKROYAPI ÖZELLİKLERİ
(PTA ile üretilen SiC+Cr3C2-esaslı kaplamaların mikroyapı özellikleri, Proceedings of 13th International Materials Symposium (2010), 1191-1198, Denizli-Turkey, 2010) Yıldırım, M.Mustafa; Islak, Serkan; Ulutan, Mustafa; Karagöz, Muzaffer; Buytoz, Soner
Bu çalışmada, Cr3C2 ve SiC toz karışımının AISI 304 paslanmaz çeliği yüzeyine plazma transferli ark kaynak yöntemi ile kaplanabilirliğinin araştırılması amaçlanmıştır. Elde edilen kaplamalarda SiC oranı ağırlıkça % 0- 100 arasında değiştirildi ve mikroyapı ve sertlik üzerine SiC’ün etkisi deneysel olarak araştırıldı. Kaplama tabakasının mikroyapısı ve mikrosertlik testi, optik mikroskop (OM), taramalı elektron mikroskobu (SEM), Xışın difraktogramı (XRD), X ışını enerji dağılım spektrometresi (EDS) ve mikrosertlik test cihazı ile incelenmiştir. Yüzeyden alt tabakaya doğru kaplama derinliği boyunca mikrosertlik değişimleri tespit edildi. Mikroyapıda oluşan γ-(Fe, Ni), Cr7C3, Cr23C6, Fe5C2, Cr3Si, CrSi2, Fe0.64Ni0.36, CFe15.1, C-(Fe, Cr)-Si fazlarının varlığında kaplama tabakalarının sertlik değerlerinde belirgin bir şekilde yükselme olduğu belirlenmiştir. In this work it has been aimed the investigation of the ability for cladding of AISI 304 stainless steel with Cr3C2 and SiC powder mixture by use of plasma transferred arc welding process. SiC rate in produced coated layer was changed between 0-100 wt.% and the effect of SiC in chosen mixture on the microstructure and hardness of the coating was tested experimentally. The microstructure and micro hardness of coating layer were investigated by using of optical microscope (OM), scanning electron micrograph (SEM), X-ray diffraction analysis (XRD), energy-dispersive X-ray analysis (EDS) and micro hardness tester. It has been observed that through the forming of hard phases; such as γ-(Fe, Ni), Cr7C3, Cr23C6, Cr3Si, CrSi2, Fe0.64Ni0.36, CFe15.1, C-(Fe, Cr)-Si, the hardness of coated layer was increased clearly.