Additive and Impurity Distributions at Grain Boundaries in
Additive and impurity distributions at grain boundaries in sintered Al 2 O 3 were determined using a scanning Auger microprobe transmission electron microscopy metallography and electron probe analysis. The results indicated that Ca was present uniformly at the boundaries as a segregant whereas the Mg or Ni levels observed resulted from nonequilibrium spinel particles.
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(PDF) Engineered expansion routes for alumina-magnesia
Alumina-magnesia refractory castables are well known for their expansive behavior which is usually associated to the in-situ spinel formation at tempera- tures in the range of 1000 and 1500°C.
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USAHydraulically-bonded monolithic refractories
This invention relates to cement-free refractories exhibiting high green strength improved corrosion resistance and improved magnesium oxide hydration resistance useful as refractory castables for steel ladles slag contact areas ladle sidewalls and bottoms and the like and as precast refractory shapes such as well blocks nest blocks and the like.
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Evolution of in Situ Refractories in the 20th Century
Johannes Solarek Christina Bachmann Yvonne Klemm Christos G. Aneziris Horst Biermann and M. Rigaud High‐Temperature Compression Deformation Behavior of Fine‐Grained Carbon‐Bonded Alumina Journal of the American Ceramic Society 99 4 () (2016).
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Evolution of in Situ Refractories in the 20th Century
Johannes Solarek Christina Bachmann Yvonne Klemm Christos G. Aneziris Horst Biermann and M. Rigaud High‐Temperature Compression Deformation Behavior of Fine‐Grained Carbon‐Bonded Alumina Journal of the American Ceramic Society 99 4 () (2016).
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Green RefractoriesConcepts Approaches and Practices
It is known that the setting behavior of CA cement bonded castables is likely to be af-fected by ambient temperature particularly at low temperature the initial setting will be too long or even never occur. To tackle with this problem Almatis developed a new type cement called temperature independ-ent cement. A comparative investigation of
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Hou Zhi Wang Scientific.Net
The influence of magnesia and corundum on thermal shock resistance of non-cement bonded alumina-based permeable brick was investigated. The results indicated that in the gas blow process the high temperature regions near the working face of the brick gradually expanded with the increase of
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Mineralizing alumina–magnesia cement-bonded castables
Nov 01 2015 · Vibratable alumina–magnesia castable compositions were designed using the Alfred particle packing model (q=0.26) .Coarse tabular alumina was added as aggregates (d≤6 mm Almatis USA) and the matrix fraction comprised dead burnt magnesia (Magnesita Refratários S. A. Brazil Table 1) reactive alumina (CL370 C Almatis USA) and calcium aluminate cement (Secar 71 Kerneos
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A Review on Recent Advances on Magnesia-Doloma
Schaefer rediscovered monolithic linings at 1914 which were pliable in the beginning but evolved to cement-bonded powdery concretes in the 1930 s 12 . In the 1960 s calcium-aluminate cement more specifically Cement Fondue started to be used for refractory applications followed by higher-quality 70 and 80 cement at the end of 1970
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Sintering and Performance of High Alumina Refractory with
Abstract. Sintering behavior and performance of high alumina refractory based on the ternary subsystem MgAl 2 O 4-CaAl 4 O 7-CaAl 12 O 19 were investigated using ZrO 2 as an additive up to 8 wt. by solid state reaction sintering. It was found that the added ZrO 2 could dissolve in the CA 6 grains in the form of a solid solution which enhanced the isotropic growth of CA 6 grains and then
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Ceramics Special Issue Design Properties Damage and
For more than 20 years the sidewalls and bottom of steel ladles have been lined with carbon-bonded magnesia (MgO-C) and magnesia-alumina bricks (MAC). The alumina raw materials react with magnesia forming a spinel which decreases open porosity and slag infiltration.
Get PriceA Review on Recent Advances on Magnesia-Doloma
Schaefer rediscovered monolithic linings at 1914 which were pliable in the beginning but evolved to cement-bonded powdery concretes in the 1930 s 12 . In the 1960 s calcium-aluminate cement more specifically Cement Fondue started to be used for refractory applications followed by higher-quality 70 and 80 cement at the end of 1970
Get Price
Ceramics Special Issue Design Properties Damage and
For more than 20 years the sidewalls and bottom of steel ladles have been lined with carbon-bonded magnesia (MgO-C) and magnesia-alumina bricks (MAC). The alumina raw materials react with magnesia forming a spinel which decreases open porosity and slag infiltration.
Get Price
USAHydraulically-bonded monolithic refractories
This invention relates to cement-free refractories exhibiting high green strength improved corrosion resistance and improved magnesium oxide hydration resistance useful as refractory castables for steel ladles slag contact areas ladle sidewalls and bottoms and the like and as precast refractory shapes such as well blocks nest blocks and the like.
Get Price
Engineered Expansion Routes for Alumina-Magnesia
Fig. 2 CA 6 crystals in alumina-magnesia castables containing (a) 6 or (b) 2 mass CAC after firing at 1500°C for 5 hours 10 . ment and microsilica content the magnesia grain size and the
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Proceedings of the Unified International Technical
DANA G. GOSKI PHD is the Director of Research at Allied Mineral Products in Columbus Ohio. Dr. Goski earned her PhD in Engineering from Dalhousie University Canada. She is a member of The American Ceramic Society s (ACerS) Refractories Division a co-inventor on a number of international patents and an ardent supporter of science and engineering educational outreach activities.
Get PriceProgress in Ceramics Series Refractory Ceramics
Tailoring the Microstructure of Cement‐Bonded Alumina–Magnesia Refractory Castables. Brochen_et_al-2014-International_Journal_of_Applied_Ceramic_Technology.pdf Effect of MgO Grain Size on Thermal Expansion Behavior of Alumina–Magnesia–Carbon Refractory. Delicate balance in a tough environment March 2019.
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CONGRESS UNITECR 2017
Rheological behaviors of calcium aluminate cement-hydratable alumina bonded corundum-spinel castable suspensions with different dispersants Effect of particle size of calcium aluminate cements on strength of castables at 110℃ and 800℃ Tailoring the expansion of alumina-magnesia cement-bonded castables by batio3 addition
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Journal of the American Ceramic Society Vol 93 No 10
William G. (Bill) Fahrenholtz JACerS editor-in-chief is Curators Distinguished Professor of Ceramic Engineering at Missouri University of Science and Technology specializing in processing characterization and thermodynamic analysis of ceramics. An ACerS Fellow he has been involved for more than 30 years and previously chaired the ACerS Publications Committee.
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THE PROPERTIES OF A LOW CEMENT CASTABLE
spinel-alumina castables prepared by hydrated magne-sium aluminate gels 18-24 . Instead of magnesia fines (used traditionally) those castables are bonded with sol gel derived and conventionally coprecipitated spinel gels 25 26 . Amodified method for preparing magnesia aluminate gel had been suggested by some authors
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Victor Carlos PandolfelliResearch Supported by FAPESP
Tailoring the Microstructure of Cement-Bonded Alumina-Magnesia Refractory Castables. Journal of the American Ceramic Society v. 93 n. 10 p. OCT 2010 . Web of Science Citations 20.
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EPB1Hydraulically-bonded monolithic refractories
EPB1 EPA EPA EPB1 EP B1 EP B1 EP B1 EP A EP A EP A EP A EP A EP A EP B1 EP B1 EP B1 Authority EP European Patent Office Prior art keywords refractory weight hydraulically fines alumina Prior art date Legal status (The
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Proceedings of the Unified International Technical
DANA G. GOSKI PHD is the Director of Research at Allied Mineral Products in Columbus Ohio. Dr. Goski earned her PhD in Engineering from Dalhousie University Canada. She is a member of The American Ceramic Society s (ACerS) Refractories Division a co-inventor on a number of international patents and an ardent supporter of science and engineering educational outreach activities.
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AbstractsUNITECR 2017
o15) thermomechanical behavior of high-alumina refractory castables containing partially stabilized zirconia with different o85) tailoring the expansion of alumina-magnesia cement-bonded castables by batio3 addition.. 80 o86) effect of grain size distribution on the abrasion resistance of
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In situ Spinel Expansion Design by Colloidal Alumina
Considering the alumina grain size effect on the in situ spinel formation and the associated overall volumetric expansion alumina–magnesia refractory castables containing different alumina sources were evaluated by the assisted sintering technique. Reducing the size of fine tabular alumina (<200 μm) led to lower expansion levels indicating
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A Review on Recent Advances on Magnesia-Doloma
Schaefer rediscovered monolithic linings at 1914 which were pliable in the beginning but evolved to cement-bonded powdery concretes in the 1930 s 12 . In the 1960 s calcium-aluminate cement more specifically Cement Fondue started to be used for refractory applications followed by higher-quality 70 and 80 cement at the end of 1970
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USAMethod of producing metakaolinGoogle Patents
A method of forming powdered metakaolin for use as an additive in cement based materials comprising the steps of calcining kaolin so as to reduce the hydroxyl content thereof to produce a meta-stable material have an identifiable amorphousness and pulverizing the meta-stable material into a powder having a particle size of 50 microns or less.
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Latest Development in Refractory Monolithics
• Flow behavior • Permanent linear change • Hot properties In cement bonded spinel forming castables (alumina-magnesia) the fume additions lower the temperature to onset of melting from around 1800°C to below 1400°C. Therefore cement free castables are an interesting alternative. When calcium aluminate cement is
Get PriceTHE PROPERTIES OF A LOW CEMENT CASTABLE
spinel-alumina castables prepared by hydrated magne-sium aluminate gels 18-24 . Instead of magnesia fines (used traditionally) those castables are bonded with sol gel derived and conventionally coprecipitated spinel gels 25 26 . Amodified method for preparing magnesia aluminate gel had been suggested by some authors
Get Price
