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Microanalytical investigation of high-temperature reactions in the CaO-SiO2 system
The solid state reactions of CaO and SiO2 between 1000 and 1400 C were investigated by means of microscopic and electron microprobe techniques. The principal phenomenon was found to be diffusion of Ca from CaO powder into SiO2 bulk specimens (polycrystalline quartz and silica glass), whereas diffusion of Si from SiO2 powder into CaO bulk specimens was found to take place only to a minor extent. At temperatures between 1000 and 1320 C, a solid state reaction leads to the formation of a homogeneous Ca-poor silicate layer (16 wt.% CaO in SiO2) in the SiO2 specimen, as shown in a combined X-ray scanning picture. Time and temperature dependence of this layer formation are presented. Above 1400 C the reactions are greatly accelerated by the appearance of a liquid phase. The solubility of CaO in SiO2 was found to be approximately 24 wt.%. Well developed monocalcium silicate crystals could be confirmed in the reaction zone. Si diffusion into CaO leads to Ca-rich silicates, primarily to dicalcium silicate. The microprobe calibration diagram for the system SiO2/CO was established by five reference samples using a semi-empirical procedure as well as a theroretical correction. The two methods are discussed in detail. Excellent agreement between both procedures confirms that in the given system phase analyses can be carried out without calibrations.
Microanalytical investigation of high-temperature reactions in the CaO-SiO2 system
The solid state reactions of CaO and SiO2 between 1000 and 1400 C were investigated by means of microscopic and electron microprobe techniques. The principal phenomenon was found to be diffusion of Ca from CaO powder into SiO2 bulk specimens (polycrystalline quartz and silica glass), whereas diffusion of Si from SiO2 powder into CaO bulk specimens was found to take place only to a minor extent. At temperatures between 1000 and 1320 C, a solid state reaction leads to the formation of a homogeneous Ca-poor silicate layer (16 wt.% CaO in SiO2) in the SiO2 specimen, as shown in a combined X-ray scanning picture. Time and temperature dependence of this layer formation are presented. Above 1400 C the reactions are greatly accelerated by the appearance of a liquid phase. The solubility of CaO in SiO2 was found to be approximately 24 wt.%. Well developed monocalcium silicate crystals could be confirmed in the reaction zone. Si diffusion into CaO leads to Ca-rich silicates, primarily to dicalcium silicate. The microprobe calibration diagram for the system SiO2/CO was established by five reference samples using a semi-empirical procedure as well as a theroretical correction. The two methods are discussed in detail. Excellent agreement between both procedures confirms that in the given system phase analyses can be carried out without calibrations.
Microanalytical investigation of high-temperature reactions in the CaO-SiO2 system
Mikroanalytische Untersuchungen von Hochtemperaturreaktionen im System CaO-SiO2
Gebauer, J. (Autor:in) / Weisweiler, W. (Autor:in)
High Temp. High Press. ; 1 ; 277-288
1969
12 Seiten, 11 Bilder, 18 Quellen
Aufsatz (Zeitschrift)
Englisch
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