Structure and properties of 3D printed porous Al2O3-SiO2 refractories based on silica glass binder with a complex water-polymer plasticizer/pore-former
| Parent link: | Ceramics International.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 51, iss. 14.— 2025.— P. 19661 - 19670 |
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| Other Authors: | , , , , , |
| Summary: | Title screen Aluminosilicate porous refractories and corresponding inks for 3D printing were developed using a silica glass binder suspension and fused alumina, combined with a complex plastisizer/pore-former (PPf) consisting of hydroxypropyl methylcellulose (HPMC), polyethylene glycol (PEG), and fumed SiO2. Rheological studies (rotational viscometry and plastic strength test) were conducted to assess the impact of PPf content on ink printability. Morphological studies (SEM) and phase analysis (XRD) were performed to examine the effects of sintering temperature on the porosity and density of the refractories. The compressive strength and slag resistance of the printed specimens were evaluated. Inks containing 10.5 wt % PPf exhibited high printability, making them suitable for 3D printing with nozzles of 2.5 mm and 3 mm diamters. The debinding temperature profile for the green body of the refractories was optimized to include a slow heating ramp to 185 °C to prevent deformation. The presence of approximately 6 wt % beta-alumina in the fused alumina reduces the formation temperature of the aluminosilicate melt to below 1550 °C. The refractories sintered at 1550 °C demonstrated a shrinkage of about 3 %, an open porosity of 41.7 %, an apparent density of 1.92 g/cm3, and a compressive strength of 37 MPa. The microporous structure of the refractories, characterized by an average pore size ranging from 52 μm to 95 μm depending on the sintering temperature, was attributed to the ability of HPMC in the PPf composition to form a cellular structure when mixed with water Текстовый файл AM_Agreement |
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2025
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| Online Access: | https://doi.org/10.1016/j.ceramint.2025.02.140 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=680735 |