Modified Pechini synthesis of tricalcium aluminate powder

Voicu, Georgeta; Ghiţulică, Cristina; Andronescu, Ecaterina

doi:10.1016/j.matchar.2012.08.002

Cited by 31 publications

(10 citation statements)

References 19 publications

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“…The reactivity of tricalcium aluminate with water is decreased by the incorporation of sodium, but evidence suggests that its early reactivity is increased 75) . Tricalcium aluminates can be manufactured by sol-gel 88) , solid state reaction 89) , combustion synthesis 90,91) , and polymeric precursor processes 92) .…”

Section: Resultsmentioning

confidence: 99%

Calcium silicate-based cements and functional impacts of various constituents

Saghiri

Orangi

Asatourian

et al. 2017

Dental Materials Journal

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Calcium silicate-based cements have superior sealing ability, bioactivity, and marginal adaptation, which make them suitable for different dental treatment applications. However, they exhibit some drawbacks such as long setting time and poor handling characteristics. To overcome these limitations calcium silicates are engineered with various constituents to improve specific characteristics of the base material, and are the focus of this review. An electronic search of the PubMed, MEDLINE, and EMBASE via OVID databases using appropriate terms and keywords related to the use, application, and properties of calcium silicate-based cements was conducted. Two independent reviewers obtained and analyzed the full texts of the selected articles. Although the effects of various constituents and additives to the base Portland cement-like materials have been investigated, there is no one particular ingredient that stands out as being most important. Applying nanotechnology and new synthesis methods for powders most positively affected the cement properties.

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Section: Resultsmentioning

confidence: 99%

Calcium silicate-based cements and functional impacts of various constituents

Saghiri

Orangi

Asatourian

et al. 2017

Dental Materials Journal

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“…In this study the MTA cement was obtained by a modified sol-gel method proposed by Voicu et al [12][13][14] This gel was maturated for 24 h and then dried at 125˝C for 24 h when a resin type precursor was obtained. The resin-type precursor was thermally treated in a platinum crucible at two different temperatures: 1400˝C/2 h (MTA1) and 1450˝C/3 h (MTA2), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Our research group has reported the synthesis of mineralogical compounds specific for MTA cements e.g., 2CaO¨SiO 2 [12] and 3CaO¨Al 2 O 3 [13] as well as MTA cements [14] using a non-conventional method-the sol-gel route. Compared with the solid state reaction route, the usual synthesis method for this type of materials, the sol-gel route presents some advantages like high purity of the resulted products and lower thermal treatment temperatures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Treatment Conditions on the Properties of Dental Silicate Cements

et al. 2016

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Abstract:In this study the sol-gel process was used to synthesize a precursor mixture for the preparation of silicate cement, also called mineral trioxide aggregate (MTA) cement. This mixture was thermally treated under two different conditions (1400˝C/2 h and 1450˝C/3 h) followed by rapid cooling in air. The resulted material (clinker) was ground for one hour in a laboratory planetary mill (v = 150 rot/min), in order to obtain the MTA cements. The setting time and mechanical properties, in vitro induction of apatite formation by soaking in simulated body fluid (SBF) and cytocompatibility of the MTA cements were assessed in this study. The hardening processes, nature of the reaction products and the microstructural characteristics were also investigated. The anhydrous and hydrated cements were characterized by different techniques e.g., X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR) and thermal analysis (DTA-DTG-TG). The setting time of the MTA cement obtained by thermal treatment at 1400˝C/2 h (MTA1) was 55 min and 15 min for the MTA cement obtained at 1450˝C/3 h (MTA2). The compressive strength values were 18.5 MPa (MTA1) and 22.9 MPa (MTA2). Both MTA cements showed good bioactivity (assessed by an in vitro test), good cytocompatibility and stimulatory effect on the proliferation of cells.

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“…Other C 3 A synthesis processes described in the literature are based on the use of the method Gaki et al [10] or a modification of this method to reduce the process stages and the sintering temperature [11]. In this modified synthesis it is possible to synthesize C 3 A between 1300 and 1350 °C with reaction times of 1 to 4 h. Zivica et al [12] synthesized C 3 A by several successive firings of a pressed molar mixture of CaCO 3 and Al 2 O 3 at a temperature of 1400 °C with a cooking time of 5 h. Salimi and Vaughan [13] synthesized C 3 A by priming slaked lime with a sodium aluminate solution at 368 K in a continuous stirred-tank reactor.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Calcium Aluminates from Non-Saline Aluminum Dross

López

Martı́n

Ramírez³

et al. 2019

Materials

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The present work examines the synthesis of tricalcium aluminate (for use as a synthetic slag) from the non-saline dross produced in the manufacture of metallic aluminum in holding furnaces. Three types of input drosses were used with Al2O3 contents ranging from 58 to 82 wt %. Calcium aluminates were formed via the mechanical activation (reactive milling) of different mixtures of dross and calcium carbonate, sintering at 1300 °C. The variables affecting the process, especially the milling time and the Al2O3/CaO molar ratio, were studied. The final products were examined via X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The reactive milling time used was 5 h in a ball mill, for a ball/dross mass ratio of 6.5. For a molar relationship of 1:3 (Al2O3/CaO), sintered products with calcium aluminate contents of over 90% were obtained, in which tricalcium aluminate (C3A) was the majority compound (87%), followed by C12A7 (5%).

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Modified Pechini synthesis of tricalcium aluminate powder

Cited by 31 publications

References 19 publications

Calcium silicate-based cements and functional impacts of various constituents

Calcium silicate-based cements and functional impacts of various constituents

Influence of Thermal Treatment Conditions on the Properties of Dental Silicate Cements

Synthesis of Calcium Aluminates from Non-Saline Aluminum Dross

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