In Situ Coagulation of High‐Alumina Zero‐Cement Refractory
In Situ Coagulation of High Alumina Zero Cement Refractory Castables André R Studart Department of Materials Engineering Federal University of São Carlos São Carlos SP Brazil Search for more papers by this author Victor C Pandolfelli
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As a result of their markedly high solid loading >80 vol refractory castables usually display very short interparticle distances Therefore short chain molecules capable of providing an electrical double layer sufficiently thick to prevent particle coagulation tend to be suitable dispersants for zero cement high alumina castables
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New refractory concretes based on high alumina cement are classified and a description of their main properties is presented Ultra low cement concretes of this group are shown to have special importance The efficiency of the technology of continuous monolithic lining of steel teeming ladles with the use of these concretes is noted Use of the concretes is complicated by the necessity of long
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Selection of dispersants for high alumina zero cement refractory castables By Ludwig J Gauckler Low Cement High Alumina Castables Effect of Distribution Coefficients LOW CEMENT HIGH ALUMINA CASTABLES EFFECT OF DISTRIBUTION COEFFICIENTS A THESIS IN THE PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF BACHELOR OF TECHNOLOGY
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temperatures have high density and almost zero porosity and can therefore be used as high performance refractory components For the others once any melting components have been checked for as well as the quantity of each of them use can be established according to the maximum operating temperature of the finished product
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1100 Lightweight Refractory Aggregate Castable Specifications Light weight insulating castables Applications Iron Steel Industry Cement Industry Power Industry Aluminium Industry HPI Remark A Iron Steel Industry B Cement Industry C Power Industry D Aluminium Industry E HPI Industry Product Maximum Temperature C Physical volume density kg/m 3 AIA C C S Mpa
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Abstract High alumina refractory castables with compositions in the systems CaO–Al 2 O 3 and CaO–Al 2 O 3 –SiO 2 were studied using an ultrasonic technique The technique allows in situ non destructive measurement of Young s modulus from room temperature to 1600°C Elastic and dilatometric properties were investigated in relation to
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Journal of the European Ceramic Society 25 2005 3135–3143 Reaction of aluminum powder with water in cement containing refractory castables A R Studarta ∗ M D M Innocentinib I R Oliveirab V C Pandolfellib a Department of Materials Swiss Federal Institute of Technology ETHZ Zurich CH 8092 Switzerland b Department of Materials Engineering Federal University of S˜ao Carlos
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Silicon carbide SiC is popular among researcher as a refractory material because SiC can be stable above 2700 °C and it has high strength 800–1000 MPa and fracture toughness 6–10 MPa m 1/2 can also be used in aggressive environments due to the formation of a protective coating of SiO 2 on its surface at high temperature SiC refractories are available as both non oxide and
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However it ment of high performance refractory castables 1 4 The has been observed that such long chain molecules seem appropriate dispersion of particles enables the produc to be not appropriate for the dispersion of zero cement tion of highly fluid castables with minimal water con high alumina castables since they may induce brid
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Journal of the European Ceramic Society 25 2005 3135–3143 Reaction of aluminum powder with water in cement containing refractory castables A R Studarta ∗ M D M Innocentinib I R Oliveirab V C Pandolfellib a Department of Materials Swiss Federal Institute of Technology ETHZ Zurich CH 8092 Switzerland b Department of Materials Engineering Federal University of S˜ao Carlos
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This article reports on the evaluation of novel short chain molecules to improve the dispersion of zero cement high alumina refractory castables Two approaches were investigated to enhance the dispersing efficiency of short chain compounds a the increase of the density of dissociable sites per molecule and b the improvement of the
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The binding phase in cement bonded castables is high alumina cement High alumina cement consists of mainly the phases CA CA2 and C12A7 Out of these phases C12A7 phase sets the most quickly and CA2 takes the most time to set The greater the amount of calcia in a phase the more quick setting that phase will be due to the property of calcia to
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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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This article reports on the evaluation of novel short chain molecules to improve the dispersion of zero cement high alumina refractory castables Two approaches were investigated to enhance the dispersing efficiency of short chain compounds a the increase of the density of dissociable sites per molecule and b the improvement of the
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a high energy refractory explosion in a confined area that blew refractory debris and the Hotwork equipment out the This incident happened during a very cold winter period when environmental temperatures were sub zero and it was later to Hotwork for two 70 alumina low cement castables from two different suppliers
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