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Iskalni niz: "ključne besede" (cold sintering) .

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1.
Cold sintering of perovskite-perovskite particulate composite based on ▫$K_{0.5}Na_{0.5}NbO_3$▫ and ▫$BiFeO_3$▫
Samir Salmanov, Danjela Kuščer, Mojca Otoničar, 2024, izvirni znanstveni članek

Ključne besede: cold sintering
Objavljeno v DiRROS: 18.06.2026; Ogledov: 197; Prenosov: 308
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2.
Enhancing densification of metakaolin-based geopolymers via the cold sintering process
Abdullah Jabr, Srečo D. Škapin, Sara Tominc, Nina Daneu, Jakob Koenig, Vilma Ducman, Lidija Korat Bensa, Raúl Bermejo, Matjaž Spreitzer, 2025, izvirni znanstveni članek

Povzetek: Clay-based materials typically require high-temperature processing (>900 ◦C), resulting in high energy consumption. This study explores cold sintering of metakaolin (MK) powders to achieve high mechanical strength at significantly lower processing temperatures. By applying uniaxial pressure of 400 MPa and heating to only 240 ◦ C in the presence of 15 mol/L NaOH solution, successful densification of structurally sound and dense samples with an average density of 2.16 g/cm³ and a biaxial flexural strength of ~35 MPa was achieved. This strength surpasses that of conventionally sintered MK (1470 ◦C) by ~30 %. Densification was found to be governed by synergistic mechanisms involving MK exfoliation, conformal sintering around aggregates, and the precipitation of an amorphous sodium aluminosilicate hydrate phase. Crack formation was avoided through process optimization and verified using X-ray micro-computed tomography. These findings offer new insights into the chemo- mechanical mechanisms of cold sintering and demonstrate its potential as an efficient route for producing structural materials.
Ključne besede: cold sintering, metakaolin, geopolymer, delaminations, exfoliation
Objavljeno v DiRROS: 15.10.2025; Ogledov: 773; Prenosov: 454
.pdf Celotno besedilo (7,70 MB)
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3.
Characterization and Mechanical Properties of Sintered Clay Minerals
Sara Tominc, Vilma Ducman, Jakob Koenig, Srečo D. Škapin, Matjaž Spreitzer, 2024, objavljeni znanstveni prispevek na konferenci

Povzetek: The need to reduce energy consumption and the carbon footprint generated by firing ceramics has stimulated research to develop sintering processes carried out at lower temperatures(ideally not above 300 °C) and high pressures (up to 600 MPa), the so-called cold sintering process (CSP) (Grasso et al., 2020, Maria et al., 2017). To evaluate the applicability of CSP to clays, we focused on two representative clay minerals, kaolinite and illite, and on the natural clay material obtained from a Slovenian brick manufacturer. The selected clay materials were characterized on the basis of mineralogical-chemical composition (XRD, XRF) and particle size distribution (SEM analysis, PSD, BET). The powders of clay minerals and natural clay material were first sintered in a heating microscope to determine the sintering conditions and then in a laboratory furnace at 1100 °C for 2 hours and additionally at 1300 °C for kaolinites. The effect of compression of the initial powders on their final properties was also investigated.
Ključne besede: conventional sintering, cold sintering, clay minerals, characterization, mechanical properties
Objavljeno v DiRROS: 29.03.2024; Ogledov: 2842; Prenosov: 942
.pdf Celotno besedilo (681,81 KB)
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