Oxidation resistance of Al2O3–SiC–C castables with different grades of andalusite

Chen, Anbang; Wang, Xiaoyu; Zhou, Wenying; Mu, Yuandong; Parr, Christopher; Ye, Guotian

doi:10.1016/j.jallcom.2020.156836

Cited by 11 publications

(15 citation statements)

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“…The ASC castable specimens were prepared according to the same procedures in the standards reported in previous work [8][9][10]. The castable specimens containing different micronized andalusite levels are denoted as M, F1, F2, F3, and F4, as listed in Table 1.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…Although the above-mentioned antioxidants could effectively increase the antioxidation of ASC castables, they are expensive and have a high energy consumption [6,7]. However, we recently found that the partial substitution of brown fused alumina by andalusite aggregates (8-5 mm/5-3 mm/3-1 mm) could also enhance the antioxidation of ASC castables [8][9][10][11]. Andalusite is a natural mineral, which is commonly applied in refractory materials [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Based on our previous study, adopting 19 wt% andalusite aggregates could significantly promote the antioxidation of ASC castables [8][9][10][11], as the high-temperature heating prompts the transformation of andalusite into mullite and silica-rich glass. This silica-rich glass obstructs the pore channels and impedes oxygen diffusion into the castable interior [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…This silica-rich glass obstructs the pore channels and impedes oxygen diffusion into the castable interior [15][16][17]. Furthermore, the exuded SiO 2 -rich glass from andalusite particles reacts with fine alumina to produce secondary mullite and raise the castable densification, thereby reducing the rate of oxygen diffusion into the castable interior and enhancing the oxidation resistance [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The amount of micronized andalusite introduced was limited to 5 wt% or below, which was much lower than the reported andalusite aggregate content (19 wt%). Thermal shock tests coupled with the castable oxidation index were applied to evaluate the antioxidation impact [8,9]. The antioxidation mechanism was further illuminated by the phase assemblage, hot modulus of rupture (HMOR), apparent porosity (AP), residual strength ratio (RSR), cold modulus of rupture (CMOR), and castable microstructure analysis.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Oxidation Resistance of Al2O3-SiC-C Castables via Introducing Micronized Andalusite

Wang

et al. 2021

Materials

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Additions of andalusite aggregates (19 wt%) were shown in previous literature to enhance the antioxidation of Al2O3-SiC-C (ASC) castables. This work aims to investigate whether micronized andalusite has a greater influence on antioxidation improvement than andalusite aggregates. Various low contents (5 wt% and below) of micronized andalusite (≤5 μm) were introduced as a substitute for brown fused alumina in the matrix of ASC castables. The antioxidation of castable specimens was estimated by the oxidized area ratio on the fracture surface after a thermal shock test. The microstructure and phases of micronized andalusite and the castable specimens were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The results suggest that the antioxidation effects of ASC castables with a low addition of micronized andalusite are effectively enhanced. The heat-induced transformation of andalusite produces SiO2-rich glass, favoring the sintering of the castable matrix and impeding oxygen diffusion into the castable’s interior. Therefore, the castable antioxidation is enhanced without deteriorating the hot modulus of rupture.

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Section: Sample Preparation and Characterizationmentioning

confidence: 99%