(PDF) Selection of dispersants for high-alumina zero
The content of dispersant added to the suspensions and castables is expressed throughout the paper in terms of mass of additive per the total surface area of calcined alumina particles (mg/m 2 ).White fused alumina (grade EK8R BET specific surface area < 0.05 m 2 /g 99.5 Al 2 O 3 0.36 Na 2 O Alcoa Alumı´nio Salto Brazil) in a wide
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Thermal Expansion Characteristics of Alumina–Magnesia and
The thermal expansion of Al 2 O 3 –MgO castables containing 5.5 wt MgO and 1.36 wt CaO and Al 2 O 3 –spinel castables containing 20 wt spinel having 95 wt Al 2 O 3 and 1.7 wt CaO was measured in the temperature range of 800–1650°C by dilatometry. A sharp increase in expansion from around 1425° to 1525°C followed by a sharp decrease with further increasing temperature is
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Microstructural and mechanical investigation of high
Probable mechanisms are proposed for phase and microstructural changes in high alumina refractory castable containing nano-titania. 1. Introduction Persistent developments in high-temperature industries stiffly rely on the quality of their refractory materials.
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(PDF) Hydraulic binders for refractory castables Mixing
increase of strength (4 days to attain the maxi mum value) whereas for both hydratable alumina containing castables it occurred in a shorter period of time (before 12 h). It can also be pointed out
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(PDF) Hydraulic binders for refractory castables Mixing
increase of strength (4 days to attain the maxi mum value) whereas for both hydratable alumina containing castables it occurred in a shorter period of time (before 12 h). It can also be pointed out
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Improved Corrosion Resistance of Alumina-Spinel Castable
Sep 09 2011 · Alumina-Spinel Castable by Colloidal Alumina Addition E.Y. Sako M.A.L. Braulio E. Zinngrebe S. van der Laan V.C. Pandolfelli Alumina-spinel castables are usually applied as a refractory lining of steel ladles in regions where both volumetric stability and corrosion resistance are required. However the addition of the traditional cal-
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Low Cement High Alumina Castables Effect of Distribution
strength reaches a maximum value at °C because of the formation of a ceramic bond. At elevated temperatures the strength of silica containing castables decreases due to liquid formation. The hot strength can be improved by minimising the cement content of the castable 3 .
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PAPER OPEN ACCESS (IIHFWRI O)
which enhances the flexural strength of mullite high-aluminum castables when AlF3 content When the weight is 1wt the flexural strength of the model reaches the maximum value of 35.92MPa and the residual flexural strength of the sample after 5 10 and 15 thermal shocks reaches the maximum which are respectively 2.07 MPa 1.95 MPa 1.19. MPa. 1.
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Improved Corrosion Resistance of Alumina-Spinel Castable
Sep 09 2011 · Alumina-Spinel Castable by Colloidal Alumina Addition E.Y. Sako M.A.L. Braulio E. Zinngrebe S. van der Laan V.C. Pandolfelli Alumina-spinel castables are usually applied as a refractory lining of steel ladles in regions where both volumetric stability and corrosion resistance are required. However the addition of the traditional cal-
Get PriceRelationship Between the Ratio of High Alumina Castables
Nov 12 2020 · When preparing high-alumina castables high-alumina bauxite aggregates are mainly used which accounts for about 65 to 70 . High alumina cement is 7-10 . Five to eight percent of silica fume and alumina powder. The fine bauxite powder is 15 to 24 and the water reducing agent is 0.2 . According to the time of construction choose a suitable
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castable cement refractory cement 123yilong
The high temperature compressive strength of refractory materials is the maximum pressure that can be under at high temperature of 1000 2000 which is expressed by N/mm2. The compressive strength of refractory materials is obviously changed with the increase of temperature. When the temperature rises from the constant temperature the temperature decreases linearly with the increase of
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The Differences in Performance between Lightweight and
Mar 13 2021 · The Differences in Performance between Lightweight and Heavy Alkali-Resistant Castables. Castable refractory materials that can resist the corrosion of alkali metal oxides (such as K2O and Na2O) at medium and high temperatures are called alkali-resistant refractory castables.The composition of this type of castable is similar to the castable combined with ordinary calcium
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Low Cement High Alumina Castables Effect of Distribution
strength reaches a maximum value at °C because of the formation of a ceramic bond. At elevated temperatures the strength of silica containing castables decreases due to liquid formation. The hot strength can be improved by minimising the cement content of the castable 3 .
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Precipitation Strengthening of Aluminum by Transition
In order to improve the high temperature tensile strength of the alloy other transition metals specifically manganese zirconium and vanadium are added to the Al-Al 3 Ni eutectic composition so that upon artificially aging the alloy transition metal trialuminides form in the α-aluminum phase of the
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Improved Corrosion Resistance of Alumina-Spinel Castable
Sep 09 2011 · Alumina-Spinel Castable by Colloidal Alumina Addition E.Y. Sako M.A.L. Braulio E. Zinngrebe S. van der Laan V.C. Pandolfelli Alumina-spinel castables are usually applied as a refractory lining of steel ladles in regions where both volumetric stability and corrosion resistance are required. However the addition of the traditional cal-
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IMPACT OF DISPERSANTS ON THE MECHANICAL STRENGTH
It is clear that the HMP has a great effect on the strength development of the castables so that the use of HMP in combination with PCE is able to improve the strength of the castable. A very important characteristic is the green strength development of a castable. It is created by the formation of hydrates of the clinker phases.
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Microstructural and mechanical investigation of high
Probable mechanisms are proposed for phase and microstructural changes in high alumina refractory castable containing nano-titania. 1. Introduction Persistent developments in high-temperature industries stiffly rely on the quality of their refractory materials.
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Use of POLYCARBOXYLATE ETHERS to Improve the
improve e.g. flow behaviour of castable formulations nowadays polymers of a polycarboxylate ether type (PCE) are used 3 . Due to an electrosteric repulsion mechanismcoming from the comb-like structure with a negatively charged backbone and non-ionic side chainsthis type of dispersants show good properties for improved handling of a mix.
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Thermal Expansion Characteristics of Alumina–Magnesia and
The thermal expansion of Al 2 O 3 –MgO castables containing 5.5 wt MgO and 1.36 wt CaO and Al 2 O 3 –spinel castables containing 20 wt spinel having 95 wt Al 2 O 3 and 1.7 wt CaO was measured in the temperature range of 800–1650°C by dilatometry. A sharp increase in expansion from around 1425° to 1525°C followed by a sharp decrease with further increasing temperature is
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Criteria for developing castable creep-resistant aluminum
challengesfor developing such a castable precipitation-strengthened thermally-stable Al-based alloy. The current work is distinguished from other reviews most notably by Starke and colleagues 11–13 devoted to the intelligent design of high-strength aluminum alloys. This work is con-cerned less with design but rather focuses on
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Task 6.7.2Improved Corrosion Resistance of Alumina
article osti_1674 title = Task 6.7.2Improved Corrosion Resistance of Alumina Refractories author = Hurley John P and Kleven Patricia L abstractNote = In order to increase the efficiency of advanced coal-fired power systems higher working fluid temperatures must be reached. To protect some system surfaces they are covered with corrosion-resistant refractories.
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EFFECTS OF MnO ADDITIONS ON THE PROPERTIES OF
Normally the properties of castables are modified by adding mineralizing compounds which are normally used to decrease the reaction temperature and accelerate the densification of castables. In this work the influence of MnO additions on the properties of calcium aluminate cement-bonded alumina-magnesia castables was investigated.
Get PriceTask 6.7.2Improved Corrosion Resistance of Alumina
article osti_1674 title = Task 6.7.2Improved Corrosion Resistance of Alumina Refractories author = Hurley John P and Kleven Patricia L abstractNote = In order to increase the efficiency of advanced coal-fired power systems higher working fluid temperatures must be reached. To protect some system surfaces they are covered with corrosion-resistant refractories.
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Castable Scientific.Net
The quality of these refractories applied on IGCC should be a key factor that affects the entire cost of electric power production. In this study low cost chromia-alumina castables were chosen as candidate refractories for IGCC. To enhance the workability of chromia-alumina castables ultrafine alumina powder was added to improve the workability.
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EFFECTS OF MICROSILICA CONTENT ON THE
rundum-spinel ceramics and prepared high-strength lightweight castables containing the porous corundum-spinel aggregates 10 11 . The corrosion mechanisms of traditionally dense alumina-magnesia refractories by slag have been studied. The corrosion and penetration resistance of the castables depend on the castables composition distribution and
Get PriceImproved Corrosion Resistance of Alumina-Spinel Castable
Sep 09 2011 · Alumina-Spinel Castable by Colloidal Alumina Addition E.Y. Sako M.A.L. Braulio E. Zinngrebe S. van der Laan V.C. Pandolfelli Alumina-spinel castables are usually applied as a refractory lining of steel ladles in regions where both volumetric stability and corrosion resistance are required. However the addition of the traditional cal-
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HE EVELOPMENT OF MECHANICAL TRENGTH ITHIN
the castable hardening kinetics. It is the castable hardening kinetics that controls the development of strength and subsequent de-moulding times for installed castables. Thus the optimisation of castable placing properties aimed at reducing installation time can induce delays in mould stripping and therefore delays in ultimate relining
Get PriceNanotechnology in castable refractoryScienceDirect
Jan 01 2019 · An increase in ionic strength proportional to the charge and concentration of the ions present in the solution can also be an alternative. Salts of Fe (III) or Al (III) can be added to increase the ionic strength of the solution. Nouri-Khezrabad et al. used the combination of alumina CS and CAC or HA as components in refractory castables . The
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PAPER OPEN ACCESS (IIHFWRI O)
which enhances the flexural strength of mullite high-aluminum castables when AlF3 content When the weight is 1wt the flexural strength of the model reaches the maximum value of 35.92MPa and the residual flexural strength of the sample after 5 10 and 15 thermal shocks reaches the maximum which are respectively 2.07 MPa 1.95 MPa 1.19. MPa. 1.
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(PDF) Novel Engineering Route to Improve the Green
The use of colloidal silica as a CaO-free binding system for refractory castables has been increasing recently. Nevertheless the resultant low green mechanical strength of these castables has
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