Onset sintering-coarsening-coalescence kinetics of calcite powders

Lin, Peng-Wen; Shen, Pouyan

doi:10.1016/j.jeurceramsoc.2013.06.023

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…However, the mechanism by which this effect takes place has not yet been explained. It is worth highlighting that Lin and Shen [15] described an effect called Sintering-Coarsening-Coalescence (SCC) on CaCO3 particles exposed to temperatures close to 400 ºC, but the reasons why refractories containing CaCO3 and Al2O3 showed E increase at lower temperatures remain unclarified.…”

Section: Introductionmentioning

confidence: 99%

Al2O3–CaO macroporous ceramics containing hydrocalumite-like phases

Borges

Santos

Salvini

et al. 2020

Ceramics International

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A mechanism to explain the lower onset strengthening temperature induced by CaCO3 in alumina-based macroporous ceramics is proposed, which relies on hydrocalumite-like phase formation during processing. Close to 600 °C, such phases are decomposed to lime and mayenite (12CaO·7Al2O3), where the latter, due to its intrinsic nanoporosity and high thermal reactivity, generates bonds between the ceramic particles at ~700ºC, resulting in microstructure strengthening. Based on this premise, the authors concluded that other Ca 2+ sources could act similarly. Indeed, compositions containing Ca(OH)2 or CaO showed the same effect on the onset strengthening temperature, which reinforces the proposed mechanism. The results attained indicated that macroporous insulators could be thermally treated at lower temperatures, just to acquire enough mechanical strength for installation, finishing in-situ their firing process. Besides that, lower sintering temperatures could be used to produce macroporous ceramics that would be applied in low thermal demand environments, e.g. aluminum industries.

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Section: Introductionmentioning

confidence: 99%

Al2O3–CaO macroporous ceramics containing hydrocalumite-like phases

Borges

Santos

Salvini

et al. 2020

Ceramics International

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“…CaCO 3 particle coalescence was shown more pronounced in samples subjected to a stress of 650 MPa with subsequent heating at 600 °C for 10 min. 31 Water-free amorphous calcium carbonate (ACC) nanoparticles sintered at 250−400 °C under 20 MPa compressive stress exhibited higher strength compared to those with lower sintering temperature. 32 Surface area reduction was reported in the sample sintered at 400 °C.…”

Section: Introductionmentioning

confidence: 99%

“…Higher temperatures less than calcium carbonate decomposition temperature potentially enhance the sintering. CaCO 3 particle coalescence was shown more pronounced in samples subjected to a stress of 650 MPa with subsequent heating at 600 °C for 10 min . Water-free amorphous calcium carbonate (ACC) nanoparticles sintered at 250–400 °C under 20 MPa compressive stress exhibited higher strength compared to those with lower sintering temperature .…”

Section: Introductionmentioning

confidence: 99%

Cold Sintering of Calcium Carbonate for Construction Material Applications

Zahabi¹,

Said

Memari

2021

ACS Omega

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An alternative to traditional binder-based construction materials using "cold sintering", a hydrothermal mechanism that involves subjecting the sample to simultaneous pressure and comparatively low temperatures, was explored. Ground and precipitate calcium carbonates (GCC and PCC) were used as the primary starting materials. Ordinary portland cement (OPC) and zinc oxide were studied for comparison. Compressive strength tests showed promising results from the OPC mortars with the cement mostly replaced by GCC. Scanning electron microscopy showed sintering of calcium carbonate and zinc oxide with the selection of suitable solutions. Porosity of sintered samples measured by nitrogen adsorption−desorption improved considerably. These data support the feasibility of cold sintering as an alternative method for production of conventional precast construction materials.

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