Preparation of anorthite ceramics using SPS

Csáki, Štefan; Lukáč, František; Húlan, Tomáš; Veverka, Jakub; Knapek, Michal

doi:10.1016/j.jeurceramsoc.2021.03.004

Cited by 17 publications

(4 citation statements)

References 28 publications

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“…XRD analysis (Figure 2) showed that the same compounds were identified in the control and impregnated samples (anorthite, gehlenite, mullite, tridymite, quartz, corundum, grossite), but the intensities of anorthite were much higher in the impregnated samples. According to the literature, anorthite has good physical properties, such as a low thermal expansion coefficient and good thermal shock resistance at high temperatures; thus, it could improve the properties of refractory castables [32]. SEM images show that the microstructure of the impregnated and fired at 1100 °C samples, regardless of composition, is denser (Figure 3a-d) compared with the control samples (Figure 3e-h).…”

Section: The Impact Of Impregnation On Refractory Castable Chemical A...mentioning

confidence: 84%

Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass

Malaiškienė,

Antonovič,

Boris

et al. 2023

Ceramics

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This study examines the impact of the impregnation of fireclay-based conventional (CC) and medium-cement castables (MCCs) with liquid sodium silicate glass under vacuum conditions. The goal is to assess how this treatment affects the physical and mechanical properties and durability (alkali and thermal shock resistance) of these castables used in biomass combustion boilers, where they are exposed to temperatures up to 1100 °C. The research work employs standard test methods to evaluate the physical and mechanical properties. Additionally, advanced techniques such as scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and specific tests for alkali resistance and thermal shock resistance are used. The research findings suggest that impregnation with sodium silicate glass under vacuum significantly enhances the alkali resistance of both CC and MCCs. This improvement is primarily due to the reduction in porosity and the increase in density. SEM images reveal that the impregnated samples are coated with a glassy layer and the pores are partially filled with sodium silicate. Tests for alkali resistance demonstrate the formation of a protective glassy layer (with a thickness of 0.9–1.5 mm) on the castable surfaces, thereby reducing the further penetration of alkali into deeper layers of the samples. However, it is important to mention that the impregnated refractory castables have reduced resistance to thermal shock cycles.

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Section: The Impact Of Impregnation On Refractory Castable Chemical A...mentioning

confidence: 84%

Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass

Malaiškienė,

Antonovič,

Boris

et al. 2023

Ceramics

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“…Anorthite was determined in all studied samples and its amount varied from 24% to 39%. Ca-feldspar, which differs from anorthite only in one crystalline lattice parameter c [14], was determined in samples. Its amount varied from 16% to 46%.…”

Section: Resultsmentioning

confidence: 99%

Study of the illite-kaolinite-CaCO₃ mixtures during firing

Mikušová,

Húlan,

Lukáč

et al. 2023

J. Phys.: Conf. Ser.

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The raw materials used in traditional ceramics include highly plastic clay minerals such as illite or kaolinite. Non-plastic materials are usually added to the mixtures, which affect their workability and sintering process. The formation of a new crystalline phase (e.g. anorthite) is often observed in mixtures that contain a large amount of CaO. The improvement of final properties of ceramic materials is attributed to the formation of anorthite. The aim of this paper is to study the firing of anorthite ceramics in the system illite-kaolinite-CaCO3. Four sets of samples with different illite:kaolinite ratio (8:2, 6:4, 4:6, 2:8), and with a constant addition of CaCO3 are produced. The samples were subjected to the thermal and structural analyses. A significant mass loss is observed for all studied samples during the process of dehydroxylation and decomposition of CaCO3. An exothermic peak around 950 °C, which is connected with the formation of anorthite, is observed during differential thermal analysis. Above this temperature, no significant length changes are recorded. The presence of anorthite is confirmed by XRD analysis. The most formation of anorthite is observed in the illite-kaolinite sample with ratio 8:2.

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“…Referring to previous studies, CaO-Al 2 O 3 -SiO 2 phase diagrams, and exploratory experiments, [10][11][12][13] solid waste-based ceramics with UMCB content of 60 wt% were prepared. The raw materials were thoroughly mixed according to the formulation design listed in Table 2.…”

Section: Preparation Of Used Refractory-based Ceramicsmentioning

confidence: 99%

Preparation and properties of anorthite‐based ceramics by using metallurgical solid waste and fly ash

Shen

Huang

Zhang

et al. 2023

Int J Applied Ceramic Tech

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A large amount of metallurgical solid waste accumulation poses a serious threat to the environment. Study on synergistic reinforcement of synthetic process of metallurgical solid waste-based ceramics with fly ash is of great significance in reducing environmental pollution and resource utilization. A metallurgical solid waste-based ceramic used as building ceramic was developed with the erosion part of used MgO-C bricks and fly ash as main raw materials, and the amount of solid waste added to the prepared ceramics was at least 60 wt% and up to 90 wt%. The effects of fly ash content and sintering temperature on the crystalline phase transitions, morphologies, and the main physical and mechanical properties of ceramics were investigated by X-ray diffraction, scanning electron microscopy, and mechanical testing. The results show that the obtained ceramics presented maximum bending strength and minimum water absorption, 80.14 MPa and 5.04%, respectively, when the raw material proportions were the erosion part of used refractories accounted for 60 wt%, fly ash 20 wt%, pyrophyllite 10 wt%, and quartz sands 10 wt%, and the process parameters were the sintering temperature 1150 • C, sintering time 120 min, and molding pressure 15 MPa.

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Preparation of anorthite ceramics using SPS

Cited by 17 publications

References 28 publications

Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass

Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass

Study of the illite-kaolinite-CaCO₃ mixtures during firing

Preparation and properties of anorthite‐based ceramics by using metallurgical solid waste and fly ash

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Preparation of anorthite ceramics using SPS

Cited by 17 publications

References 28 publications

Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass

Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass

Study of the illite-kaolinite-CaCO3 mixtures during firing

Preparation and properties of anorthite‐based ceramics by using metallurgical solid waste and fly ash

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Product

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Study of the illite-kaolinite-CaCO₃ mixtures during firing