Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass
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 ther...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/6/4/142 |
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| author | Jurgita Malaiškienė Valentin Antonovič Renata Boris Andrius Kudžma Rimvydas Stonys |
| author_facet | Jurgita Malaiškienė Valentin Antonovič Renata Boris Andrius Kudžma Rimvydas Stonys |
| author_sort | Jurgita Malaiškienė |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-08T20:55:07Z |
| format | Article |
| id | doaj.art-d3d2570b648b4a54904fdbbdf6b34e49 |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-08T20:55:07Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-d3d2570b648b4a54904fdbbdf6b34e492023-12-22T13:59:53ZengMDPI AGCeramics2571-61312023-12-01642320233210.3390/ceramics6040142Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate GlassJurgita Malaiškienė0Valentin Antonovič1Renata Boris2Andrius Kudžma3Rimvydas Stonys4Laboratory of Composite Materials, Institute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaLaboratory of Composite Materials, Institute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaLaboratory of Composite Materials, Institute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaLaboratory of Composite Materials, Institute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaLaboratory of Composite Materials, Institute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaThis 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.https://www.mdpi.com/2571-6131/6/4/142refractory castableimpregnationliquid sodium silicate glassalkali resistancephysical and mechanical propertiesthermal shock resistance |
| spellingShingle | Jurgita Malaiškienė Valentin Antonovič Renata Boris Andrius Kudžma Rimvydas Stonys Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass Ceramics refractory castable impregnation liquid sodium silicate glass alkali resistance physical and mechanical properties thermal shock resistance |
| title | Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass |
| title_full | Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass |
| title_fullStr | Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass |
| title_full_unstemmed | Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass |
| title_short | Analysis of the Structure and Durability of Refractory Castables Impregnated with Sodium Silicate Glass |
| title_sort | analysis of the structure and durability of refractory castables impregnated with sodium silicate glass |
| topic | refractory castable impregnation liquid sodium silicate glass alkali resistance physical and mechanical properties thermal shock resistance |
| url | https://www.mdpi.com/2571-6131/6/4/142 |
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