Alumina-Carbon Refractory Castables Containing Calcium
The physical properties namely bulk density apparent porosity cold crushing strength of carbon-containing high alumina based refractory castable containing both natural and modified graphites (94 fixed carbon) have been evaluated within the temperature region 110–1500 °C.
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The Overview of the Refractory Technology from the Mini
Alumina 2050 C 3722 ºF Chromia 2275 C 4127 ºF Calcia 2600 C 4712 ºF Zirconia 2700 C 4892 ºF Magnesia 2800 C Class Characteristics Result Of Ceramic Strong to high temps brittle High Temp Firing 80 AluminaFired Mechanical Wear . One-sided heating One-sided expansion tensile compression stresses
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Preparation and Characterization of Mullite-Alumina
5 Dokko PC Pask JA Mazdiyasni KS. High-Temperature Mechanical Properties of Mullite Under Compression. Journal of the American Ceramic Society. 197760(3-4) . Links 6 Ismael MR Salomão R Pandolfelli VC. Refractory Castables Based on Colloidal Silica and Hydratable Alumina. American Ceramic Society Bulletin. 200786(9) 58-62
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A REVIEW OF REFRACTORY BOND SYSTEMS FOR
CAC is not the best option for densification at temperatures in the 800°C-1200°C range for applications where high thermal shock and erosion resistances are essential properties such as for petrochemical and aluminum industries. Taking these aspects into account novel castable
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Technological properties of high alumina refractories with
Nov 23 2018 · The scope of the present research is to prepare high alumina batch using Aswan clay and China calcined bauxite as well as to study the effect of different phosphoric acid percentages on the technological properties of the fired samples through monitoring the densification parameters cold crushing strengths and thermal shock resistance.
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Processing and Characterization of Alumina / Chromium
Alumina is one of the important materials in structural ceramic application because of its excellent mechanical properties good chemical stability and high temperature characteristics (Ghate et al. 1975 Wang Hsu 1996). Its intrinsic brittleness and relatively poor reliability however made the toughening of alumina ceramics an important and
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Castable Scientific
Abstract The effects of B 4 C addition on the room temperature physical properties and hot mechanical properties of MgO-SiC based refractory castables were investigated using magnesia and SiC fines as starting materials and silica fume as a binder. The microstructure was characterized by scanning electron microscopy (SEM). The results showed that drying strength of MgO-SiC based castables
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Kyu Hong Hwang Scientific
Abstract Refractory castable specimens were prepared using industrial white fused alumina as aggregates chromium oxide green and ultrafine alumina powder as matrix materials solid aluminum dihydrogen phosphate (Al(H 2 PO 4) 3) or liquid AlPO4 as binder materials.Effect of different binder additions on the properti Subscript text es of high chromium oxide IGCC refractory castables such
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Issue No. 2 AugustTechna Group
Two different batches of zero-cement castables composed of 85 wt. fused MgO-spinel aggregate with 10 wt. hydratable alumina and 5 wt. of either kaolin or alumina/silica fine powder mixture were prepared and compared with other two conventional castables of the same composition where hydratable alumina is replaced by high alumina cement. The
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Porogenic Behavior of Water in High-Alumina Castable
Direct casting is a processing method that can produce large parts of complex geometry. It uses dispersions of ceramic particles in water and a hydraulic binder for consolidation. Studies on castable structures have reported the generation of a significant fraction of pores due to the presence of water. This effect occurs because drying preserves part of the interparticle pores originally
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All articlesJournal of Ceramic Science
The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of the relationships between processing microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials.
Get PriceLecture Evaluations of Thermal and Mechanical Properties
Evaluations of Thermal and Mechanical Properties of RefractoriesFundamentals and Applications 5.1 Inelastic Deformation Plastic Creep Visco-Elastic -Fundamental(2)- Ishikawa M.
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Refractory castables based on SiC slab waste
castables containing 80 alumina cement is due to the high purity of the cement and hence the little content of the low melting phases formed which affect adversely the refractory properties of castable samples containing 50 alumina cement.
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Papersrefractories-worldforum
Influence of Different Matrix Components on the Rheological and Mechanical Properties of High-Alumina LC Castables. Maria Webb-Janich Udo Martin Mario Bernard. Volume 4 Issue 1 Pages 7984. Keywords deflocculants high-alumina LC castables. Abstract References Full Article
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(PDF) THERMAL AND MECHANICAL PROPERTIES OF HIGH
Association of Metallurgical Engineers of Serbia Scientific paper AMES UDC 666.948.3 THERMAL AND MECHANICAL PROPERTIES OF HIGH ALUMINA LOW CEMENT CASTABLE Sanja Martinović1 Milica Vlahović1 Jelena Majstorović2 Branko Matović3 Tatjana Volkov-Husović4 1 Institute for Technology of Nuclear and Other Mineral Raw Materials 86 Franchet d Esperey 11000 Belgrade Serbia 2
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NANO IDEA Open Access Densification characteristics of
densification behavior of these castables. Keywords densification chromia/alumina castables IGCC Introduction The gasification process converts carbonaceous materi-als such as coal petroleum coke and biomass to synth-esis gas consisting of H 2 and CO that can be utilized as a chemical feedstock or for powder generation. The ash
Get PriceInjection Molding of Alumina-Chromia-Yttria Composites
and chromia powders (produced from chromium ac-etate hydroxide) at 1200°C/2h in a hydrogen atmo-sphere. YCrO 3 was blended with an a-alumina ( North America S BET 8 m²/g d 50 = 0.3 lm) in a ratio of 2.5/97.5wt . The manufacturer s data were verified by means of laser granulometry (Malvern Lasersizer) SEM images were taken of YCrO 3
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Issue No. 2 AugustTechna Group
Two different batches of zero-cement castables composed of 85 wt. fused MgO-spinel aggregate with 10 wt. hydratable alumina and 5 wt. of either kaolin or alumina/silica fine powder mixture were prepared and compared with other two conventional castables of the same composition where hydratable alumina is replaced by high alumina cement. The
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PAPER OPEN ACCESS (IIHFWRI O)
High aluminum castables were prepared by injecting mullite whiskers in situ at high temperature by adding Al(NO3)3·9H2O and NH4F to high alumina castables. It is 0 0.5 wt 1 wt 2 wt 4 wt . The materials were mixed stirred cast and demolded and then fired at 1400 C.
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Refractory castables based on SiC slab waste
castables containing 80 alumina cement is due to the high purity of the cement and hence the little content of the low melting phases formed which affect adversely the refractory properties of castable samples containing 50 alumina cement.
Get PriceLecture Evaluations of Thermal and Mechanical Properties
Evaluations of Thermal and Mechanical Properties of RefractoriesFundamentals and Applications 5.1 Inelastic Deformation Plastic Creep Visco-Elastic -Fundamental(2)- Ishikawa M.
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PAPER OPEN ACCESS (IIHFWRI O)
High aluminum castables were prepared by injecting mullite whiskers in situ at high temperature by adding Al(NO3)3·9H2O and NH4F to high alumina castables. It is 0 0.5 wt 1 wt 2 wt 4 wt . The materials were mixed stirred cast and demolded and then fired at 1400 C.
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Conference and Exhibition of the European Ceramic Society
Thermal residualstressesin alumina-basedceramicheirinfluence on mechanicalproperties 21 R.I. Todd Mechanicalproperties andoxidation ofnucleargraphites 123 J.M.VidalandT.J. Mays Studyofthefineparticlesystemin alumina-spinelcastables 145
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Technological properties of high alumina refractories with
High alumina refractory batches were prepared from Egyptian clay and imported China calcined bauxite. Three concentrations of phosphoric acid 3 5 and 7 were added to study their effects on some of their technological properties. Designed batches tend to form a composition of 76 alumina and 17 silica in addition to the other fluxing and alkali oxides.
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A REVIEW OF REFRACTORY BOND SYSTEMS FOR
CAC is not the best option for densification at temperatures in the 800°C-1200°C range for applications where high thermal shock and erosion resistances are essential properties such as for petrochemical and aluminum industries. Taking these aspects into account novel castable
Get Price
Injection Molding of Alumina-Chromia-Yttria Composites
and chromia powders (produced from chromium ac-etate hydroxide) at 1200°C/2h in a hydrogen atmo-sphere. YCrO 3 was blended with an a-alumina ( North America S BET 8 m²/g d 50 = 0.3 lm) in a ratio of 2.5/97.5wt . The manufacturer s data were verified by means of laser granulometry (Malvern Lasersizer) SEM images were taken of YCrO 3
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