Self flowing refractory castables study of the hydraulic
Refractories are enabling materials in that their primary function is to facilitate the production of other materials such as metals glasses petrochemicals and cements. They have enabled the utilization of heat to make materials since the Bronze Age. Although in recent years a number of studies concerning the many complex variables that determine the rheologic hydraulic and ceramic
Get PriceDensification characteristics of chromia/alumina castables
The densification effect was examined by adding ultrafine alumina powder to reduce the amount of water and improve the flow ability of the chromia/alumina refractory castable. Experimental procedure The particle size distribution of the castable was adjusted to a theoretical self-flowing continuous curve based on the Andreassen model 3 .
Get PriceImprovements in Drying Behaviour and Explosion Resistance
block was produced with no problems using a fast firing program (20–850 °C at a heating rate of 50 °C/h). 1 Introduction Silica-sol bonded no-cement castables (NCCs) have been used in the refractory industry for many years. Compared to low-cement castables they exhibit fast dry-out and excellent high temperature properties.
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Abstract Previous works based on statistical design of experiments (DoE) defined a model all-alumina self-flow refractory castable (SFRC) with optimized particle size distribution for simultaneous high flowability index (FI) and superior post-sintering performance. This work compares the SFRC rheological behaviour and setting time with those of alternative all-alumina castables with different
Get PriceThe Effect of Temperature on the Fundamental
In this research the impact of firing temperature and MgO addition on mechanical and physical properties of self–compacting no-cement castables were investigated. For this propose up to 3.3 wt of MgO was added to the corundum castable compositions and the specimens were fired at 600 °C 800 °C 1000°C 1200°C and 1500°C. The mixtures were made so that the consistency of each one was
Get Price(PDF) CONTROL OF FORMULATION AND OPTIMISATION OF SELF
The effect of nano-size additives on the electrical conductivity of matrix suspension and properties of self-flowing low-cement high alumina refractory castables By Sasan Otroj The effect of deflocculants on the self-flow characteristics of ultra low-cement castables in Al2O3–SiC–C system
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Europ. Ceram. Soc. 27 (2007) 1849– 1853 8 Altun I.A. Effect of temperature on the mechanical properties of self-flowing low cement refractory concrete. Cement and Concrete Research 31 (2001) 1233–1237 9 Das S. et al. No cement high alumina self flow castable. Amer.
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May 27 2020 · The outstanding characteristic of high alumina low cement castables is density and high strength which brings a lot of benefits for the use.
Get Price(PDF) Statistical modelling of the particle size
Statistical modelling of the particle size composition of an alumina matrix for no-cement self-flowing refractory castables. Materials science forum 2006 the "turning point" and then decide if the mixture is a good one to be used as a matrix for a self-flowing castable. Low Cement High Alumina Castables Effect of Distribution
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Yu. E. Pivinskii "New castables and binding systems Basic direction in the development and use of refractories in the 21 st century. Part III. Spinel and cast (self-flowing) castables "Ogneup. Tekh. Keram. No. 4 12–18 (1998). Google Scholar
Get PriceImprovements in Drying Behaviour and Explosion Resistance
block was produced with no problems using a fast firing program (20–850 °C at a heating rate of 50 °C/h). 1 Introduction Silica-sol bonded no-cement castables (NCCs) have been used in the refractory industry for many years. Compared to low-cement castables they exhibit fast dry-out and excellent high temperature properties.
Get Price(PDF) High performance refractory castables Particle size
Due to such needs the objective of this paper was to evaluate the impact of the range and particle size distribution on the rheology of zero-cement (100 Al2O3) refractory castable. Castables
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This work investigated the changes in the permeability of high-alumina self-flowing refractory castables based on calcium aluminate cement (CAC) and hydratable alumina binder (HAB) pretreated between 110° and 1650°C. Permeability constants k1 and k2 were fitted from Forchheimer s equation based on airflow tests conducted at room temperature.
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Sep 12 2010 · Key words no-cement castable silica-sol microsilica gel-bond additive 1. INTRODUCTION No-cement refractory castables have been of great interest in the last two decades. Different no-cement systems such as microsilica colloidal silica hydratable alumina and colloidal alumina have been developed1-4. Silica-sol bonded refractory
Get PriceNON-CemeNt refraCtOry CaStableS CONtaiNiNg NaNO
In this study the effect of nano-silica sol content on the self-flow characteristics microstructure physical and mechanical properties of high-alumina self-flowing non-cement castable has been studied. The self-flow characteristics such as self-flow value and working time has been evaluated.
Get PriceNanotechnology in Refractory Castables — An Overview
May 30 2018 · In recent times nanotechnology has gained significant attention in the field of refractory research. As the unshaped refractory especially the castable is becoming of prime importance in refractory research a good amount of work is going on globally to study the effect of nanotechnology on castables. The Effect of different nano-oxide binders formed from colloidal bonding agents and nano
Get PriceProperties of alumina based low-cement self flowing
Jan 01 2007 · Fig. 6 shows the effect of calcined alumina on the flow behaviour of the self flowing castable. Calcined alumina increases the flow diameter but as mentioned above as this type of material is added to the system more the flocculation starts to occur. Download Download full-size image Fig. 6.
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Nov 01 2014 · High‐Alumina Boron‐Containing Refractory Castables High‐Alumina Boron‐Containing Refractory Castables Luz Ana Paula Santos Tiago Pandolfelli Victor Carlos Medeiros Jorivaldo 00 00 00 Introduction High‐alumina calcium aluminate cement‐bonded refractory castables are commonly used in risers for fluid catalytic converter (FCC) units.
Get PriceEFFECT OF DISTRIBUTION COEFFICIENTS SILICA SOL
The hot strength can be improved by minimising the cement content of the castable. The performance of alumina based castables has improved because of the reduction in the cement-content thus diminishing the liquid phase formation at application temperatures and improving the corrosion and creep resistance.
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Effect of binder and its amount on the high alumina self flow castable has been studied. Self flow castable has been prepared fixing the distribution coefficient q at 0.21 in the continuous particle size distribution model as proposed by Dinger-Funk. High alumina cement and silica sol were used at
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It is found that the self flowing refractory which is prepared by using 0.23 n -value has the best self flowing properties. In addition to these studies different alumina types which affect the aggregate system and the roles of additives (calcined alumina microsilica) are also examined by using n = 0.23 value.
Get PriceHigh Alumina Low Cement Castables SalesRongsheng
May 27 2020 · The outstanding characteristic of high alumina low cement castables is density and high strength which brings a lot of benefits for the use.
Get PriceThermomechanical evaluation of self-flowing refractory
May 01 2012 · Much has been discussed about the advantages regarding the thermomechanical performance of self-flow refractory castables (SFRC) with very little or
Get Price(PDF) The effect of deflocculants on the self-flow
For the present study q is chosen to be to the ultra low-cement castables in the same systems. 0.24 and the particle size distribution of the castable with In this paper the effects of deflocculants on the properties this value of q is represented in Fig. 1. of ultra low-cement self-flowing Al2O3–SiC–C castable is studied.
Get PriceNON-CemeNt refraCtOry CaStableS CONtaiNiNg NaNO
In this study the effect of nano-silica sol content on the self-flow characteristics microstructure physical and mechanical properties of high-alumina self-flowing non-cement castable has been studied. The self-flow characteristics such as self-flow value and working time has been evaluated. The bulk density apparent porosity mechanical properties and microstructure of fired castables at
Get PriceEFFECT OF DISTRIBUTION COEFFICIENTS SILICA SOL
The hot strength can be improved by minimising the cement content of the castable. The performance of alumina based castables has improved because of the reduction in the cement-content thus diminishing the liquid phase formation at application temperatures and improving the corrosion and creep resistance.
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This paper deals with the performance of alumina sol prepared from a cheaper precursor and used as a bonding agent in no-cement refractory castables fabricated by simple tapping technique.
Get PriceNON-CemeNt refraCtOry CaStableS CONtaiNiNg NaNO
In this study the effect of nano-silica sol content on the self-flow characteristics microstructure physical and mechanical properties of high-alumina self-flowing non-cement castable has been studied. The self-flow characteristics such as self-flow value and working time has been evaluated. The bulk density apparent porosity mechanical properties and microstructure of fired castables at
Get PriceThermomechanical evaluation of self-flowing refractory
May 01 2012 · Much has been discussed about the advantages regarding the thermomechanical performance of self-flow refractory castables (SFRC) with very little or
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