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refractory-castable
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Effect of different additives on the properties of alumina-spinel castables
, Article Ceramica ; Volume 58, Issue 348 , 2012 , Pages 489-494 ; 03666913 (ISSN) ; Nemati, A ; Sharif University of Technology
2012
Abstract
Physical properties of low cement castable containing 22 wt.% Al 2O3-rich MgO-Al2O3 spinel and 1.7 wt.% CaO with addition of polyacrylates, castament FS20, TPP and citric acid were investigated. Results showed castables including castament FS20 have higher flow values and better final properties comparing with castables including Darvan 7S and TPP. Also in this study we investigated the effect of addition of microsilica up to 4 wt.% on the properties of alumina-spinel castables. Microsilica is the finest particles in the system and due to suitable distribution of microsilica among other particle the open porosity reduced and mechanical strength increased. Slag penetrations resistance...
The effect of nano-size additives on the electrical conductivity of matrix suspension and properties of self-flowing low-cement high alumina refractory castables
, Article Ceramics International ; Volume 36, Issue 4 , 2010 , Pages 1411-1416 ; 02728842 (ISSN) ; Sagaeian, A ; Daghighi, A ; Nemati, Z. A ; Sharif University of Technology
Abstract
Influence of two nano-size additives oSubject:A. Suspensions. Subject:C. Electrical conductivity. Subject:Castable. Subject:E. Refractories. Subject:Castables. Subject:Electrical conductivity. Subject:Electrical property. Subject:High alumina. Subject:matrix. Subject:Mechanical strength. Subject:Nano-size. Subject:Polycarboxylate ethers. Subject:Refractory castables. Subject:Working time. Subject:Alumina. Subject:Cement additives. Subject:Electric conductivity. Subject:Ethers. Subject:Suspensions (fluids) Subject:Refractory materials. n electrical properties of suspension matrix of self-flowing low-cement high alumina refractory castable is investigated. For this purpose, castament FS 10 and...
Molten salt synthesis of a SiC coating on graphite flakes for application in refractory castables
, Article Ceramics International ; 2016 ; 02728842 (ISSN) ; Bavand Vandchali, M ; Golestani Fard, F ; Nemati, A ; Sharif University of Technology
Elsevier Ltd
Abstract
A silicon carbide coating was formed on the surface of graphite flakes by reaction of molten Si with carbon at 1100-1300. °C in a 95%KCl-5%NaF molten salt under Ar atmosphere. The effect of temperature and Si/graphite ratio in the initial mixture on the quality and the amount of SiC were investigated by XRD and SEM/EDS analyses. Also, the water wettability, oxidation resistance and zeta potential of un-coated and coated graphite were examined by TGA analysis and sedimentation test. The results show the amount of coating to increase in the coated flakes with increasing temperature and Si/graphite ratio. The SiC coating improves water wettability of graphite and acts as a protective layer to...