The effect of deflocculants on the self-flow
· The influence of several deflocculants on the self-flow characteristics of an ultra low-cement high-alumina castable in the Al 2 O 3 –SiC–C system has been studied. The behavior of various deflocculants in high-alumina castables was evaluated in terms of apparent viscosity and pH of the matrix and self-flow value of the castable.
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CEMENT MATERIAL DEVELOPMENT USED FOR
· Development of special cement for cementing UCG well is needed due to its high process temperature (up to 1300°C). The objective of this research is to develop a cement material that can withstand high temperatures environment. Domestically available an oil
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The effect of deflocculants on the self-flow
· The dispersion of high-alumina zero-cement castables containing silicon carbide and graphite has been investigated in many articles. However less attention has been paid to the ultra low-cement castables in the same systems.
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Journal of the European Ceramic Society Journal Impact IF
Manufacturing a high performance film of CaO-B2O3-SiO2 glass-ceramic powder with surface modification for LTCC application Lin Bo-Ting · Lu Yu-Wei · Shieh Jay · Chen Miin-Jang · Chen Miin-Jang How the coarse fraction influences the microstructure and the effective thermal conductivity of alumina castablesAn experimental and numerical
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Materials Free Full-Text Electronic Optical and
Calcium aluminates are a series of inorganic compounds obtained by sintering calcium oxide and alumina at high temperatures. They have a wide variety of allotropes and different geometric structures and are mainly used for refractory materials calcium aluminate cements optoelectronic devices etc. 1 2 .Among them monocalcium aluminate (CaAl 2 O 4) is mainly used for hydraulic cements
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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
Get Price2102.02008 Novel drying additives and their evaluation
· The drying step of dense refractory castables containing hydraulic binders is a critical process which usually requires using slow heating rates due to the high explosion trend of such materials during their first thermal treatment. Thus this work investigated the performance of alternative additives to induce faster and safer drying of self-flowing high-alumina refractory castables bonded
Get PriceMagnesia-spinel-based zero-cement refractory castables
Two different batches of zero-cement cascables 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 densification parameters cold crushing strength
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Thermomechanical evaluation of self-flowing refractory
· Previous works demonstrated that a 100 alumina SFRC with optimized particle size distribution simultaneously results in high-flowability fresh paste and high mechanical strength. In this work the thermomechanical behaviour of zero-cement ceramic matrix is compared to that of the equivalent composite with 1 CAC content.
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170 questions with answers in CERAMIC ENGINEERING
· Powder undergoes sintering (increased piston travel) 3. Powder undergoes thermal expansion (decreased piston travel) The MEASURED piston travel is
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The effect of deflocculants on the self-flow
· The influence of several deflocculants on the self-flow characteristics of an ultra low-cement high-alumina castable in the Al 2 O 3 –SiC–C system has been studied. The behavior of various deflocculants in high-alumina castables was evaluated in terms of apparent viscosity and pH of the matrix and self-flow value of the castable.
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Fabrication and properties of binders for high-alumina
· With allowance for the jaw crusher screened into fractions _< 1.0 1.0- 2.0 and composition the technology of production and the structure 2.03.2 mm in size and subjected to magnetic separation. the obtained zero-cement castables can be classified as a va- Each fraction contained _< 1.0 0.2 and < 0.1 magnetic in- riety of ceramic
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Effect of alphabond300 additions on properties of Al 2 O 3
· The use of refractory castables as a material for lining of runners of blast furnaces is considered. Ultra low cement and non cement castables are developed in conformance with modern technological requirements and environmental standards. The influence of alphabond300 additions on the performance of an ULC tab-corundum castables in the Al2O3-SiC-C system was studied.
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CEMENT MATERIAL DEVELOPMENT USED FOR
· Development of special cement for cementing UCG well is needed due to its high process temperature (up to 1300°C). The objective of this research is to develop a cement material that can withstand high temperatures environment. Domestically available an oil
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The Effect of Nanosized Carbon Black on the Physical and
· The results showed that the relative heat resistance of composites increased with the amount of carbon black. This can be correlated with the filling of pores and voids by CB particles beside gels so that the structure of the castable is not compacted and stresses can be relaxed under the influence of heating cycles .Castable without CB contains two sources of gel content namely alumina
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Microstructures of refractory castables prepared with sol
· For the ULCC composition alumina silica mullite and spinel sols were applied as additives. The application of silica sol is quite common in refractory castables whereas the use of alumina mullite and spinel sols (prepared from cheaper precursor) in high alumina based castables has been discussed by some authors .For the LCC composition spinel gels prepared from two different routes
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Fabrication and Characterization of Porous MgAl2O4
· addition amounts of deionized water the fabricated porous MgAl2O4 ceramics had a high apparent porosity (52.5–65.8 ) a small average pore size structure (around 1–3 m) and a relatively high compressive strength (12–28 MPa). The novel aqueous gel-casting process with easy access is expected
Get PriceALCIUM LUMINATE CEMENT (CAC) BASED CASTABLES FOR
· castables bonded with calcium aluminate cement were manufactured industrially and castable production in Japan commenced in 1939.3 With nearly seventy years history refractory castables bonded with calcium aluminate cements have evolved from high cement conventional formulations to the era of low cement ultra low cement and cement free systems.
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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
Get PriceLithofacies diagenesis and reservoir quality of Upper Shu
· Abundant cement with blocky morphology and fine to coarse crystal sizes (0.05–5 mm) has filled most of the primay and secondary macropores previously present in all lithofacies except LF-4 and LF-5. Cement crystals typically increase in size from the edges toward the centers of former pores but many former pores lack the finer crystals.
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Investigating the Effects of Cement Type and W/C Ratio
· to cement ratio on the corrosion phenomenon the electrical resistance method was used. For this purpose use was made of 7 different water to cement ratios and two types of cement (type 2 and type 5). Drawing the electrical resistance diagrams it was shown that with increase in the water to cement ratio corrosion rate increases in concrete.
Get PriceHighly Concentrated Ceramic Binding Suspensions (HCBS)
· Many HCBS-based materials first de- One will not hesitate to assert that quartz refractories manu- veloped in were specific zero-cement castables factured at the PDP rank among the world s best at present. with high-level properties in certain important characteris- Along with the large-scale production of refractories tics
Get PriceJournal of Ceramic Science and Technology Journal Impact
Journal Impact IF Ranking · In the Ceramics and Composites research field the Quartile of Journal of Ceramic Science and Technology is Q3. Journal of Ceramic Science and Technology has been ranked #58 over 106 related journals in the Ceramics and Composites research category.
Get PriceDifferences in the Corrosive Spalling Behavior of Alumina
The energy transition from the incineration and gasification of fossil fuels to the incineration and gasification of biomass refractory linings is being held up by a severe corrosion issue caused by high alkali contents and the wide variety of biomass sources. Incinerators optimized for fossil fuels are commonly lined with mullite Al2O3-Cr or SiC-based refractory products however those
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A new generation of unshaped refractories SpringerLink
"In situ coagulation of high-alumina zero-cement refractory castables " J. Am. Ceram. Soc. 85(8) 1947–1953 (2002). CAS Article Google Scholar 12. H. M. Wyss et al. "Small-angle static light scattering of concentrated silica suspensions during in situ destabilization " J. Colloid.
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170 questions with answers in CERAMIC ENGINEERING
· Powder undergoes sintering (increased piston travel) 3. Powder undergoes thermal expansion (decreased piston travel) The MEASURED piston travel is
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Thermomechanical evaluation of self-flowing refractory
· Previous works demonstrated that a 100 alumina SFRC with optimized particle size distribution simultaneously results in high-flowability fresh paste and high mechanical strength. In this work the thermomechanical behaviour of zero-cement ceramic matrix is compared to that of the equivalent composite with 1 CAC content.
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Wetting of by Molten Aluminum The Influence of Additions
2.1. Specimen Preparation. The effect of BaSO 4 on the wettability of alumina by molten aluminum was studied for several Al 2 O 3-BaSO 4 compositions. One was pure alumina and other three had BaSO 4 additions at the 1 3 and 5 levels. The specimen preparation consisted of mixing a 99.96 0.5 m alumina powder with 1 3 and 5 of a 99.9 BaSO 4 (1 m). ). Individual 100 g batches were
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Science.gov USA.gov for ScienceGovernment Science Portal
· Science.gov is a gateway to government science information provided by U.S. Government science agencies including research and development results.
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