Results 201 to 210 of about 1,652 (235)

Studies on the hydration of calcium aluminates

Journal of Thermal Analysis, 1984
The hydration reactions of calcium aluminate in water and in Na2CO3 solution have been investigated using calorimetric, DTA, DTG and XRD methods.
M. Gawlicki, W. Nocuń-Wczelik, M. Pyzalski   +2 more
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New calcium aluminate hydrates

Journal of Applied Chemistry, 1957
AbstractSeveral modifications of the ‘hexagonal’ tetracalcium and dicalcium aluminate hydrates have been obtained, some of which have not been described previously. Only a newly established 4CaO,Al2O3, 19H2O hydrate, and an α‐form and a hitherto undescribed β‐form of a 2CaO,Al2O3,8H2O hydrate have been found to occur in the aqueous system at 25°. Other
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Thermodynamic properties of calcium aluminates

The Journal of Physical Chemistry, 1981
Enthalpy and entropy values for solid calcium aluminates have been compared with activity measurements and the known phase diagram to obtain improved revised values and an accurate calculated phase diagram for this binary system. The revised entropies (J mol/sup -1/ K/sup -1/) at 298/sup 0/K are 205.05 +- 0.8 for Ca/sub 3/Al/sub 2/O/sub 6/, 114.22 +- 0.
Isaac Eliezer, Naomi Eliezer, Reed A. Howald, Puligandla Viswanadham   +3 more
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The capture of carbon dioxide by transition metal aluminates, calcium aluminate, calcium zirconate, calcium silicate and lithium zirconate

Frontiers of Chemical Science and Engineering, 2011
The capture of CO2 by transition metal (Mn, Ni, Co and Zn) aluminates, calcium aluminate, calcium zirconate, calcium silicate and lithium zirconate was carried out at pre- and post-combustion temperatures. The prepared metal adsorbents were characterized by Xray diffraction (XRD), scanning electron microscope (SEM), surface area analysis and acidity ...
Ganesh Tilekar, Kiran Shinde, Kishor Kale, Reshma Raskar, Abaji Gaikwad   +4 more
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The crystallization of calcium aluminate glasses

Journal of Microscopy, 1981
The crystallization characteristics of two commercial calcium aluminate glasses have been studied using scanning electron microscopy. In particular it is demonstrated how atomic number contrast can be used to identify rapidly crystalline phases without the need for etching and the related loss of compositional and morphological information.
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THE HYDRATION OF THE ALUMINATES OF CALCIUM.: II. THE HYDRATION PRODUCTS OF TRICALCIUM ALUMINATE

Canadian Journal of Research, 1929
Further studies on the isometric form of hydrated tricalcium aluminate are reported. These include methods of preparation, crystalline forms, X-ray diffraction pattern, and determinations of solubility and density. The products formed when the hexagonal form of hydrated tricalcium aluminate is dehydrated at definite vapor pressures of Water at 21 °C.,
T. Thorvaldson, N. S. Grace, V. A. Vigfusson   +2 more
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Sintering of calcium aluminate mixes

British Ceramic Transactions, 1999
Abstract Measurements of initial sintering shrinkage of mixes of CaAl4O7 and CaAl2O4 are reported in the temperature range 1360–1420°C. The particle size chosen was -45 μm and the mix proportions were 5 : 8, 4 : 10, and 3 : 11 by weight of CaAl4O7 and CaAl2O4 . The soaking periods were from 10 to 180 min.
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A Toxicity Profile for Calcium Aluminate

Journal of Dental Research, 1972
J, Autian, J E, Hamner
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Sintering study of calcium aluminate

Journal of Materials Science, 1996
Measurement of the initial sintering shrinkage of CaAl2O4 at temperatures of 1300, 1325 and 1350 °C are reported. The particle sizes chosen were −53 + 45, −63 + 53 and −75 + 63 microns and the soaking periods were from 15 to 360 min. A time dependence of the shrinkage has shown that volume diffusion is the dominant mechanism of sintering.
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Stress Induced Defects in Vitreous Calcium Aluminates

Applied Optics, 1966
Induced flaws on vitreous calcium aluminates were investigated quantitatively by applying controlled loading forces to fresh breakage surfaces. Test surfaces were chemically treated to display surface flaws, dynamically created by an indenter. The mean value of flaw length was linearly related to the square root of the applied load on the indenter.
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