Thermal decomposition of calcium carbonate (calcite polymorph) as examined by in-situ high-temperature X-ray powder diffraction

Karunadasa, Kohobhange S. P.; Manoratne, C.H.; Pitawala, H.M.T.G.A.; Rajapakse, R.M.G.

doi:10.1016/j.jpcs.2019.05.023

Cited by 333 publications

(145 citation statements)

References 32 publications

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“…Five grams of coated CaCO 3 samples were kept at 105°C for half an hour and dehumidified. Because the thermal decomposition temperatures of CaCO 3 , ITT, and SA were 750°C, [ 23 ] 196°C, [ 24 ] and 360°C, [ 25 ] respectively, we heated the dehumidified coated CaCO 3 samples to 405°C in a furnace and allowed them to stand at this temperature for 1 hour. The weight loss at 405°C was used to calculate the amount of coating agent grafted onto the surface of the micronized CaCO 3 particles.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the effect of reactive and nonreactive treatments on the dispersion characteristics of a calcium carbonate (calcite) filler in a polypropylene matrix composite

Ersoy

Köse²

2020

Polymer Composites

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The excellent properties of the composites distinctly depend on the filler particles dispersion, which has close relationship with the surface treatment of filler particles. To improve the compatibility between the filler particles and the matrix, the surface of filler particles is generally treated with coating agents, which can be classified as “dispersants” and “coupling agents.” Coating calcite (CaCO3) with dispersants is called a nonreactive treatment. The surface modification of CaCO3 with coupling agents is called reactive treatment. In this study, physical, chemical, morphological, rheological, and mechanical analyses were conducted to determine the effect of reactive and nonreactive surface treatment agents on the dispersion of CaCO3 in polypropylene/CaCO3 composites. Both agents successfully made the surface of CaCO3 hydrophobic. The results of this study revealed that, although stearic acid (SA) establishes stronger bonds with the calcite surface, isopropyl tristearyl titanate, unlike SA, improves the properties of the final product composite, which forms a bond at the polymer/filler interface.

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Section: Methodsmentioning

confidence: 99%

Comparison of the effect of reactive and nonreactive treatments on the dispersion characteristics of a calcium carbonate (calcite) filler in a polypropylene matrix composite

Ersoy

Köse²

2020

Polymer Composites

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“…The polymorphic transition of calcite into aragonite occurred during purification (at 700C for 1 h) [9]. The presence of CaO as a minor phase caused by the partial decomposition of calcium carbonate during the purification (organic removal) of SP-2 [10]. For this reason, loss on ignition (L.O.I) value below 1000°C of SP-2 was found 2 % less.…”

Section: Characterization Of Seashell Powdersmentioning

confidence: 99%

“…The recipes of glazes are given in Table 1. After ball-milling of glaze compositions for 30 min in alumina media, they were applied on the surface of different fired bodies such as red clay body (B1), chamotte body (B2), white body (B3) and porcelain body (B4) by dipping technique [10]. After glaze application, the sintering of glazed bodies was performed at 1100ºC for 8 h under atmospheric conditions.…”

Section: Preparation Of Glazesmentioning

confidence: 99%

The Replacement of Seashells with Calcite in White Ceramic Glaze Preparation

Köroğlu

Pekşen

2020

Sakarya University Journal of Science

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In this study, the effect of seashell utilization as a replacement for calcite on the surface features and optical properties of white ceramic glazes was investigated. As received seashells collected from Black Sea beaches of Samsun, Turkey and purified seashells at 700°C for 1 h were used as calcite replacement by 15 wt.%. Seashell powders were incorporated to white glaze compositions which are applied on the surface of different fired clay bodies such as red clay, chamotte, white and porcelain by dipping technique. Next, the glazed green bodies were sintered at 1100ºC for 8 h. Following to TG-DTA, heating microscope, XRD and optical analysis, the obtained results exhibited that as received seashell powder (SP-1) was composed of calcite (CaCO3), whereas purified seashell powder (SP-2) comprised aragonite (CaCO3) and calcium oxide (CaO). The iron (hematite) content in red clay and the impurities in seashells composition caused specks and crawlings on the surface of glazed red clay bodies and of some glazes containing seashell, respectively. In generally, the higher CaO content in SP-2 enhanced gloss (60°) values, and whiteness values of most glazed surfaces were closed to each other. The color of chamotte bodies increased redness-greenness values. The variations in optical parameters were mainly associated with the difference in body compositions. SP-1 contained glaze, applied on porcelain body, was selected as optimal because that had 33 gloss value, high whiteness (87) and no surface defect. Therefore, the utilization of as received seashells by 15 wt.% as calcite replacement allows eco-friendly and cost-effective production of white ceramic glazes without any additional heat treatment.

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“…These mineral compounds were predicted from EDX and FTIR analysis of BioAsh of those most likely to undergo thermal decomposition in coating when heattreated in TGA. The potential thermal decompositions of compounds that might take place caused a mass loss of samples, as shown in Table 3 [32][33][34][35][36]. These mineral compounds were predicted from EDX and FTIR analysis of BioAsh of those most likely to undergo thermal decomposition in coating when heat-treated in TGA.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Fire Resistance and Mechanical Properties of Intumescent Coating Using Novel BioAsh for Steel

et al. 2020

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Recent developments of intumescent fire-protective coatings used in steel buildings are important to ensure the structural integrity and safe evacuation of occupants during fire accidents. Flame-retardant intumescent coating applied to structural steel could delay the spread of fire and heat propagation across spaces and structures in minimizing fire risks. This research focuses on formulating a green intumescent coating utilized the BioAsh, a by-product derived from natural rubberwood (hardwood) biomass combustion as the natural substitute of mineral fillers in the intumescent coating. Fire resistance, chemical, physical and mechanical properties of all samples were examined via Bunsen burner, thermogravimetric analysis (TGA), carbolite furnace, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR), freeze–thaw cycle, static immersion and Instron pull-off adhesion test. Sample BioAsh intumescent coating (BAIC) 4-7 incorporated with 3.5 wt.% BioAsh exhibited the best performances in terms of fire resistance (112.5 °C for an hour under the Bunsen burner test), thermal stability (residual weight of 29.48 wt.% at 1000 °C in TGA test), adhesion strength (1.73 MPa under Instron pull-off adhesion test), water resistance (water absorption rate of 8.72%) and freeze–thaw durability (no crack, blister and color change) as compared to other samples. These results reveal that an appropriate amount of renewable BioAsh incorporated as natural mineral fillers into the intumescent coating could lead to better fire resistance and mechanical properties for the steel structures.

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Thermal decomposition of calcium carbonate (calcite polymorph) as examined by in-situ high-temperature X-ray powder diffraction

Cited by 333 publications

References 32 publications

Comparison of the effect of reactive and nonreactive treatments on the dispersion characteristics of a calcium carbonate (calcite) filler in a polypropylene matrix composite

Comparison of the effect of reactive and nonreactive treatments on the dispersion characteristics of a calcium carbonate (calcite) filler in a polypropylene matrix composite

The Replacement of Seashells with Calcite in White Ceramic Glaze Preparation

Fire Resistance and Mechanical Properties of Intumescent Coating Using Novel BioAsh for Steel

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