Yazar "Ayas, Erhan" için listeleme
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Al2O3-Er3Al5O12 ötektik seramiklerinin üretimi ve karakterizasyonu
Özerdem, Ece (Anadolu Üniversitesi, 2015)Bu çalışama iki kısımdan oluşmaktadır. Birinci kısmı Al2O3/EAG ötektiğini, herhangi bir sinterleme ilavesi katkısında bulunmadan üretimini içermektedir. Al2O3 ve EAG fazlarının iç içe geçtiği ince, düzensiz ötektik mikroyapısı ... -
Al2O3-TiC/TiCN kompozit malzemelerinin üretim yöntemleri
Ayas, Erhan (Anadolu Üniversitesi, 2003)Alümina kesici uçlar metal işleme operasyonlarında 1930'lu yıllardan itibaren yaygın olarak kullanılmaktadır. Saf alümina kesici uçlar düşük kırılma tokluğunun yanı sıra düşük termal iletkenliğe sahiptir. Bu özelliklerin ... -
alpha/beta SiAlON BASED COMPOSITES INCORPORATED WITH MoSi2 FOR ELECTRICAL APPLICATIONS
Ayas, Erhan; Kara, Alpagut; Kara, Ferhat (Amer Ceramic Soc, 2010)Electrically conductive alpha-beta SiAlON composites containing 30 vol. % MoSi2 was prepared by gas pressure sintering (GPS). The effect of sintering atmosphere on phase formation, grain growth, mechanical and electrical ... -
An alternative composite approach to tailor the thermoelectric performance in SiAlON and SiC
Kaya, Pınar; Gregori, Giuliano; Yordanov, Petar; Ayas, Erhan; Habermeier, Hanns-Ulrich; Maier, Joachim; Turan, Servet (Elsevier Sci LTD, 2017)The thermoelectric properties of SiAlON and SiC based composites prepared by adding TiCN (5 and 10 vol.%) as a particulate or as a segregated three-dimensional network were investigated. Although the volume fraction of the ... -
Analytical transmission electron microscopy observations on the stability of TiCN in electrically conductive alpha-beta SiAlON/TiCN composites
Yurdakul, Hilmi; Turan, Servet; Ayas, Erhan; Tunckan, Orkun; Kara, Alpagut (Elsevier Sci LTD, 2014)Coating of alpha-beta SiAlON granules with TiCN powder led to a continuous 3D electrically conductive network formation. Here, the stability of TiCN grains following gas pressure sintering (GPS) and its effect on the ... -
Characterization of Thermochromic Pigments as Coating Materials
Civan, Lale; Kurama, Semra; Ayas, Erhan (2018)In this study, thermochromic coatings were produced using thermochromic pigment and polyvinylpyrrolidone (PVP). It is aimed to develop innovative materials that will reduce external dependence, increase international ... -
Decolouration effect of WC addition on gas pressure sintered alpha-beta SiAlON ceramics
Ayas, Erhan; Kara, Alpagut; Mandal, Hasan; Turan, Servet; Kara, Ferhat (Elsevier Science BV, 2004)In this study, an attempt was made to mask an inhomogeneous gray colouration featured on the surfaces of the gas pressure sintered alpha-beta SiAlON ceramics containing 50% alpha and 50% beta SiAlONs in the form of spots. ... -
Densification and properties of in-situ synthesized ZrB2-SiC composities from ZrO2, B4C and SiC system
Gürcan, Kübra; Yılmaz, Burcu; Ayas, Erhan (Korean Assoc Crystal Growth, Inc, 2017)Zirconium diboride-silicon carbide (ZrB2-SiC) ceramics were in-situ synthesized and densified by the spark plasma sintering (SPS) method using ZrO2, B4C and SiC as starting powders. Both synthesis and densification processes ... -
The effect of heat-treated boron derivative waste at 600 degrees C on the mechanical and microstructural properties of cement mortar
Kaman, Derya Over; Köroğlu, Levent; Ayas, Erhan; Güney, Yücel (Elsevier Sci LTD, 2017)Turkey holds 73% of the world's boron deposits. 25.3% of the total deposits are tincal ore and located in Eskisehir Kirka region. During the production of 1 million tons of borax pentahydrate (Na2O center dot 2B(2)O(3)center ... -
Effect of Precipitation Method on Properties of Hydroxyapatite Powders
Yoruc, A. B. Hazar; Karakaş, A.; Ayas, Erhan; Koyun, A. (Polish Acad Sciences Inst Physics, 2013)The aim of this study was the compare the properties of hydroxyapatite as a function of two different methods (chemical and biomimetic precipitation). Powder products were called as chemical hydroxyapatite for chemical ... -
Fabrication and microstructural stability of spark plasma sintered Al2O3/Er3Al5O12 eutectic
Özerdem, Ece; Ayas, Erhan (Elsevier Sci LTD, 2015)Al2O3-Er3Al5O12 (BAG) eutectic was prepared by a arc melting process under Ar atmosphere. Button shaped melts, containing fine sized irregular eutectic structures of 'Chinese script', with interpenetrated Al2O3 and EAG ... -
Fabrication of in situ Ni(W)-WC nano composites via mechanical alloying and spark plasma sintering
Genç, A.; Ayas, Erhan; Öveçoğlu, M. L.; Turan, Servet. (2012)Microstructural and mechanical properties of spark plasma sintered Ni-30 wt% W powders fabricated via mechanical alloying (MA) for 48 h were reported in the present study. Due to the intensive WC contamination during MA, ... -
In vitro cytotoxicity of monticellite based bioactive ceramic powder synthesized from boron derivative waste
Barutca, Banu; Köroğlu, Levent; Ayas, Erhan; Koparal, Ayşe Tansu (Elsevier Sci LTD, 2018)The cytotoxicity of monticellite based bioactive ceramic powder, which was synthesized from boron derivative waste has been determined by in vitro assays of MTT, NRU, and JC-1 staining. The toxicity of powder on different ... -
In-situ synthesis and densification of HfB2 ceramics by the spark plasma sintering technique
Gürcan, Kara; Ayas, Erhan (Elsevier Sci LTD, 2017)Hafnium diboride (HfB2) ceramics were in-situ synthesized and densified by the spark plasma sintering (SPS) method using HfO2 and amorphous boron (B) as starting powders. Both synthesis and densification processes were ... -
Lantanit katkısı yapılan doğal florapatitin lüminesans özelliklerinin incelenmesi
Demir, Burak (Anadolu Üniversitesi, 2017)Doğal apatitlerin floresans olduğu bilinmektedir. Son yıllarda Ln3³? katkılı apatitler üzerinde oldukça fazla çalışma yapılmıştır. Bu çalışmada ise doğal florapatit yapısına katkılanan lantanit iyonlarının (Ca??(PO?)?F?:xLn³?) ... -
Magnetic MCM-41 silica particles grafted with poly(glycidylmethacrylate) brush: Modification and application for removal of direct dyes
Arıca, Tugce A.; Ayas, Erhan; Arıca, M. Yakup (Elsevier Science BV, 2017)Magnetic MCM-41composite particles were prepared and modified with (3-aminopropyl) triethoxysilane (APTES), then grafted with poly(glycidyl methacrylate) p(GMA) by surface-initiated atom transfer radical polymerization ... -
Mechanical Properties of Cement Mortar Containing Heat-Treated Boron Derivative Waste at Elevated Temperatures
Kaman, Derya Over; Köroğlu, Levent; Ayas, Erhan; Tokyay, Mustafa; Güney, Yücel (Asce-Amer Soc Civil Engineers, 2018)The largest boron reserves in the world are located in Turkey. The production of boron compounds and use of generated boron derivative waste during this production are extremely important for both economically and ... -
MECHANICAL, ELECTRICAL AND THERMAL PROPERTIES OF ?/? SiAlON-SiC COMPOSITES FABRICATED BY GAS PRESSURE SINTERING METHOD
Ayas, Erhan (2016)?/? SiAlON-SiC composites were produced by coating SiAlON based spray dried granules with varying amounts of SiC (0-10 vol % SiC) following gas pressure sintering technique. A two step sintering schedule between 1940-1990°C ... -
Microstructural evolution of mechanically alloyed and spark plasma sintered Ni-W alloy matrix composites
Genç, A.; Kaya, P.; Ayas, Erhan; Öveçoğlu, M. L.; Turan, Servet. (2013)Microstructural evolution of Ni(W) solid solution alloys fabricated via mechanical alloying (MA) of Ni - 30 wt.% W powders and spark plasma sintering (SPS) at 1000 C for 3 min were presented in this study. Due to contaminations ... -
A novel approach for preparing electrically conductive alpha/beta SiAlON-TiN composites by spark plasma sintering
Ayas, Erhan; Kara, Alpagut; Kara, Ferhat (Ceramic Soc Japan-Nippon Seramikkusu Kyokai, 2008)An effective approach for preparing electrically conductive SiAlON-TiN composites have been developed. Granules of a designed composition of alpha-beta SiAlON were obtained by spray drying and coated with varying amounts ...
