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Browsing Metalurji ve Malzeme Mühendisliği / Metallurgy and Materials Engineering by Author

Browsing Metalurji ve Malzeme Mühendisliği / Metallurgy and Materials Engineering by Author "Toplan, Hüseyin Özkan"

Now showing items 1-20 of 30

Catalytic application of 1,3,5-triazine-pentaethylenehexamine polymer-supported palladium nanoparticles in the convenient reduction of nitroarenes with sodium borohydride or hydrazine

Genç Bilgiçli, Hayriye; Zengin, Mustafa; Küçükislamoğlu, Mustafa; İmamoğlu, Mustafa; Toplan, Hüseyin Özkan; Arslan, Mustafa (SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY-TUBITAK, 2017)

The catalytic activity of 1,3,5-triazine-pentaethylenehexamine (TAPEHA) polymer-supported Pd nanoparticles was investigated in the reduction of nitro arenes to the corresponding amines by NaBH4 or N-2 H-4.H2O. Optimized ...
Densification and grain growth of SiO2 -doped ZnO

Canikoğlu, Nuray; Toplan, Nil; Yıldız, Kenan; Toplan, Hüseyin Özkan (2006)
Densification and grain growth of SiO2-doped ZnO

Toplan, Nil; Yıldız, Kenan; Toplan, Hüseyin Özkan (ELSEVIER SCI LTD, 2006)

The grain growth kinetics in the 1, 2, 3 and 4 wt.% SiO2 doped ZnO Was Studied Using the simplified phenomenological grain growth kinetics equation G(n) - G(n)(o) = K(o)texp(-Q/RT) together with microstructure properties ...
Densification and grain growth of SrO-doped ZnO

Toplan, Hüseyin Özkan (INST CHEMICAL TECHNOLOGY, DEPT GLASS CERAMICS, 2006)

The grain growth kinetics in the 1, 2, 3 and 4 wt.% SrO doped ZnO was studied using the simplified phenomenological grain growth kinetics equation G(n) - G(0)(n) = K-0 t exp(-Q/RT) together with microstructure properties ...
Densification and grain,growth of TiO2-doped ZnO

Yıldız, Kenan; Toplan, Nil; Toplan, Hüseyin Özkan; Canikoğlu, Nuray (DE GRUYTER POLAND SP ZOO, 2007)

The kinetics of grain growth in 1-4 wt. % TiO2-doped ZnO was studied using the simplified phenomenological grain growth kinetics equation together with examination of microstructure and densification of the sintered samples. ...
Dielectrical Properties of a Novel Porcelain Produced from Natural Clay, Waste Glass and Fly Ash

Toplan, Hüseyin Özkan; Atalay, Yusuf (WALTER DE GRUYTER GMBH, 2009)

A novel porcelain was obtained by sintering 50% kaolinite clay, 25% waste glass and 25% fly ash (a by-product of Turkey thermal power plant) at different temperatures of 1373-1523 K (1100-1250 degrees C). The microstructure ...
Effect of Mechanical Activation on the Structural Properties of Mn-Doped Na0.5Bi0.5TiO3 Ceramics

Kırsever, Derya; Toplan, Hüseyin Özkan (POLISH ACAD SCIENCES INST PHYSICS, 2016)

Piezoelectric ceramics (Na0.5Bi0.5)TiO3 + 0.5 mol.% Mn (Mn-NBT) have been synthesized by mechanical activation of mixed oxides BiO2, Na2CO3, TiO2 and MnO for 1 h at room temperature. Non-activated and activated Mn-NBT ...
EFFECT OF MECHANICAL ACTIVATION ON THE SYNTHESIS OF A MAGNESIUM ALUMINATE SPINEL

Kırsever, Derya; Canikoğlu, Nuray; Toplan, Hüseyin Özkan (INST ZA KOVINSKE MATERIALE I IN TEHNOLOGIE, 2016)

A magnesium aluminate spinel powder (72 % Al2O3 & 28 % MgO) was prepared with mechanical activation. Samples were sintered in a temperature range of 1400-1750 degrees C. The final sintered products were characterized with ...
Effects of mechanical activation on the non-isothermal kinetics of mullite formation from kaolinite

Toplan, Nil; Yıldız, Kenan; Toplan, Hüseyin Özkan (SPRINGER, 2011)

The non-isothermal kinetics of mullite formation from both non-activated and mechanically activated kaolinite have been studied by differential thermal analysis (DTA). Kaolinite was mechanically activated in a planetary ...
Effects of mechanical activation on the structure of talc

Kırsever, Derya; Toplan, Nil; Toplan, Hüseyin Özkan (KOREAN ASSOC CRYSTAL GROWTH, INC, 2015)

This paper presents the results of research on mechanical activation of raw talc in planetary mill. Raw talc was mechanically activated in a planetary mill for five different grinding times as 15 min, 30 min, 45 min, 60 ...
From earth minerals to nitrides

Kurt, Ali Osman; Canikoğlu, Nuray; Toplan, Hüseyin Özkan (2007)
Grain growth in the MnO added ZnO-6 wt% Sb2O3 ceramic system

Toplan, Hüseyin Özkan (ELSEVIER SCI LTD, 1997)

The effect of MnO additions between 0 and 5 wt% to the grain growth of the ZnO-6 wt% Sb2O3 system was studied between 1000 and 1300 degrees C in air. The kinetic grain growth study carried out using the expression G(n)-G(o)(n) ...
Grain Growth in the MnO Added ZnO-6 wt. % Sb2O3 Ceramic System

Toplan, Hüseyin Özkan (1997)
Grain growth in TiO2-added ZnO-Bi2O3-CoO-MnO ceramics prepared by chemical processing

Toplan, Hüseyin Özkan (ELSEVIER SCI LTD, 2002)

The effect of TiO2 on the grain growth of the ZnO-Bi2O3-CoO-MnO ceramic system prepared by chemical coprecipitation, was studied between 1150 and 1300 degreesC in air. Bi2O3 melts during firing, and then TiO2 dissolves ...
Grain growth kinetic in xTiO(2)-6 wt. % Bi2O3-(94-x) ZnO (x=0, 2, 4) ceramic system

Yılmaz, Şenol; Ercenk, Ediz; Toplan, Hüseyin Özkan (SPRINGER, 2007)

The grain growth kinetics in the 0, 2 and 4 wt.% TiO2 added ZnO-6 wt.% Bi2O3 system was studied using the simplified phenomenological grain growth kinetics equation G(n) = k . t . exp(-Q/R . T) together with the physical ...
Grain growth kinetics in the xAl(2)O(3)-6wt. % Bi2O3-(94-x) ZnO (x=0, 2, 4) ceramic system

Ercenk, Ediz; Yılmaz, Şenol; Toplan, Hüseyin Özkan (KOREAN ASSOC CRYSTAL GROWTH, INC, 2009)

The effects of the amount of Al2O3 (0, 2 and 4 wt.%) on the microstructural properties have been studied in a binary ZnO-6 wt% Bi2O3 system. The microstructure of the samples consists mainly of ZnO grains with beta-Bi2O3 ...
KEY ENGINEERING MATERIALS

Toplan, Hüseyin Özkan (TRANS TECH PUBLICATIONS LTD, 2004)

Zinc oxide varistor has classically been prepared by conventional ceramic techniques. In this study, ZnO varistor powder with homogeneous distribution grain size and shape is prepared by both controlled chemical process ...
Prediction of the Fracture Voltage of TiO2-Doped ZnO-Bi2O3-MnO-CoO Ceramics Produced by the Chemical Precipitation Method with Using Artificial Neural Networks

Arslankaya, Seher; N. K. Kaya; Toplan, Hüseyin Özkan (POLISH ACAD SCIENCES INST PHYSICS, 2019)

In this study, TiO2 (2.5 and 5.0 wt%) doped ZnO-Bi2O3-MnO-CoO were produced by chemical precipitation method. In the ceramics produced, the effect of TiO2 addition, sintering temperature, and time on breakdown voltage was ...
Processing and phase evolution in low voltage varistor prepared by chemical processing

Toplan, Hüseyin Özkan (ELSEVIER SCI LTD, 2001)

A new chemical process has been developed to form a low voltage varistor. The chemistry of process has been analysed and used to produce particles consisting of an intimate mix of ZnO, Zn2TiO4 and beta -Bi2O3 phases. The ...
Production of Sinterable Si3N4 from SiO2-Li2O-Y2O3 Mixture

Canikoğlu, Nuray; Yıldız, Kenan; Toplan, Hüseyin Özkan; Kurt, Ali Osman (TAYLOR & FRANCIS INC, 2012)

In this study, fine grained SiO2 was exposed to CRN, and then Si3N4 ceramic powders were produced. Initially, 5wt% Li2O-5 wt% Y2O3 (based on the final product) and carbon black were added to SiO2, and then powder samples ...