Effect of carbon and boron additions on pressureless sintering of silicon carbide

Download
1993
Yağcı, Cumhur

Suggestions

Effect of Nitriding on the Phase Transformations in the Fe-Mn Alloys
Binnatov, Kahraman; Ali-zade, İbrahim; Mehrabov, Amdulla (2001-11-01)
We present results concerning the nitriding e ects on phase transformations inFe { 40 at. % Mn and Fe { 50 at. % Mn alloys. These alloys were studied by meansof X-ray di raction and M ̈ossbauer-e ect spectroscopy methods at room tempera-ture. Results indicate that, after nitriding, in the absorption spectra of these alloysappears lines with hyper ne eld H330 kOe which corresponds to the eld on the57Fe nuclei in the-Fe. Annealing of the alloys at 650C temperature (nitridingtemperature) in a...
Effect of transition metal substitution on high-temperature properties of thermoelectric materials
Güneş, Murat; Özenbaş, Ahmet Macit; Parlak, Mehmet; Department of Micro and Nanotechnology (2014)
The objective of the present dissertation is to improve the thermoelectric efficiency (ZT) of Ca3Co4O9 metal oxide with a focus on nanostructuring, porosity and elemental substitution altering the electrical and thermal transport properties at high temperature and to establish a unique high temperature Seebeck coefficient and electrical resistivity measurement system. An instrument for the high temperature measurement of Seebeck coefficient and electrical resistivity of one and/or two bulk samples over a te...
Effect of silver incorporation on crystallization and microstructural properties of sol-gel derived titania thin films on glass
Akgun, Betul Akkopru; Durucan, Caner; Mellott, Nathan P. (Springer Science and Business Media LLC, 2011-04-01)
Titanium dioxide (TiO(2)) thin films, with and without silver (Ag), were prepared on float glass via sol-gel processing. The float glass substrates were pre-coated with a silica-barrier layer prior to the deposition of TiO(2)-based thin films. Silver nanoparticle incorporation into the TiO(2) matrix was achieved by thermal reduction of Ag ions dissolved in a titanium-n-butoxide (Ti[O(CH(2))(3)CH(3)](4)) based sol during calcination in air at 250, 450 and 650 A degrees C. Thin films were characterized using ...
Effect of calcium oxide addition on carbothermic formation of hexagonal boron nitride
Özkenter, Ali Arda; Sevinç, Naci; Department of Metallurgical and Materials Engineering (2009)
Hexagonal boron nitride (h-BN) formation by carbothermic reduction of B2O3 under nitrogen atmosphere at 1500°C and effect of CaO addition into the initial B2O3 – active C mixture were investigated during this study. Reaction products were characterized by powder X-ray diffraction, scanning electron microscopy (SEM) and quantitative chemical analysis. Main aim of this study was to investigate the presence of a second reaction mechanism that catalytically affects h-BN formation during CaO or CaCO3 addition in...
Effect of fillers on thermal and mechanical properties of polyurethane elastomer
Benli, S; Yilmazer, U; Pekel, F; Özkar, Saim (Wiley, 1998-05-16)
The effects of five different types of fillers on the thermal and mechanical properties of hydroxyl-terminated polybutadiene-based polyurethane elastomers were explored to develop a filled polyurethane elastomeric Liner for rocket motors with hydroxyl-terminated polybutadiene-based composite propellants. Two types of carbon black, silica, aluminum oxide, and zirconium(III)oxide were used as filler. Based on the improvement in the tensile properties and the erosion resistance achieved in the first part of th...
Citation Formats
C. Yağcı, “Effect of carbon and boron additions on pressureless sintering of silicon carbide,” Middle East Technical University, 1993.