Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1463911 | Ceramics International | 2010 | 6 Pages |
In order to improve the corrosion resistance of aluminosilicate refractories by molten aluminum, SrSO4 and BaSO4 powders were used. Mullite substrates with and without addition of 20 wt.% SrSO4 or BaSO4 were sintered at 1400 °C for 6 h. Corrosion and wetting experiments with molten pure Al and Al–7.5Si were carried out at 900 °C for 24 h and 900 °C for 2 h, respectively. The corrosion layer was thicker in the mullite sample (≥2 mm) than that of the SrSO4- or BaSO4-containing mullite samples (<50 μm). The contact angles for mullite samples containing SrSO4 or BaSO4 were higher (≈118° and 149°) than those of the mullite sample (≈109° and 127°), with both pure aluminum and Al–7Si alloy. This increase in the contact angle improves the corrosion resistance in mullite samples by means of non-wetting effect.