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Calcium aluminates
About: Calcium aluminates is a research topic. Over the lifetime, 490 publications have been published within this topic receiving 9200 citations.
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TL;DR: In this paper, preliminary experiments were conducted aimed at developing refractory ceramics of low thermal expansion based on calcium dialuminate CaAl 4 O 7, which was synthesized by a specific cycle of calcination, regrinding and firing (finally at 1450°C), the emerging phases having been identified by X-ray diffraction.
54 citations
TL;DR: In this paper, the chemical reactions involved in the corrosion of polycrystalline alumina (Al 2 O 3 ) and calcium hexaluminate-hibonite (CaAl 12 O 19 ) ceramics by two dicalcium silicate slags with additions of fluorspar (CaF 2 ) were studied using a hot-stage microscopy (HSM) up to 1600°C.
Abstract: The chemical reactions involved in the corrosion of polycrystalline alumina (Al 2 O 3 ) and calcium hexaluminate–hibonite (CaAl 12 O 19 ) ceramics by two dicalcium silicate slags with additions of fluorspar (CaF 2 ) were studied using a hot-stage microscopy (HSM) up to 1600 °C. The corrosion mechanism was investigated on post-mortem corroded samples and the phases formed at different stages of the dissolution process were characterised by reflected optical light microscopy (RLOM) and scanning electron microscopy (SEM) with energy dispersive X-ray spectrometry (EDS) microanalysis system. The attack of the fused slags on dense alumina substrates takes place through an interdiffusion mechanism producing successive layers of calcium aluminates. In porous hibonite samples chemical interactions were observed although only a layer of calcium dialuminate was formed. A sintering process in presence of liquid phase was also detected behind the reaction interphase. Thermodynamic calculations, based on the Al 2 O 3 –CaO–SiO 2 , Al 2 O 3 –CaO–SiO 2 –MgO, and Al 2 O 3 –CaO–SiO 2 –CaF 2 phase equilibrium were used to further knowledge of the corrosion mechanism.
53 citations
TL;DR: In this paper, it is proposed that the anomalous setting behavior is due to none of the hydrated calcium aluminates can form readily in the range 25-30°C.
52 citations
TL;DR: The microstructure of Al 2O3 reinforced hydroxyapatite (HA-Ca5(PO4)3OH) was studied and it was demonstrated that in this composite the Al2O3 particles are uniformly distributed in a matrix of spherical HA agglomerates formed by primary needlelike HA particles present before making green compact.
51 citations
TL;DR: The stoichiometry of Ca3Al2(SiO4)3� x(OH)4x (0p3� xp0.334), which was the main crystalline product, was established by Rietveld refinement of X-ray and neutron diffraction data and by transmission electron microscopy as discussed by the authors.
50 citations