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Abstract
MgOAl2O3SiO2 glass-ceramics were prepared by melting method. The effects of replacement of Na2O by Fe2O3 on crystallization behavior and acid resistance of glass-ceramics were studied. The results showed that with Fe2O3 addition, the crystallization peak around 860 °C increased firstly and then decreased, while the peak around 1120 °C showed opposite changes. The crystallization peak around 1000 °C shiftted to low temperatures. With heat treatment temperature increasing from 880 to 1200 °C, μ-cordierite, spinel, sapphirine and α-cordierite precipitated successively in the glass samples. Fe2O3 had little effect on the type of crystal phases, but had a great influence on their crystallinity and precipitation temperature. After heat treatment at 1200 °C, the main crystalline phase changed from μ-cordierite to α-cordierite for the glass sample without Fe2O3. The addition of Fe2O3 promoted the crystallization of α-cordierite at low temperatures, especially for 1 mol% Fe2O3 doped sample, α-cordierite obviously precipitated at 1100 °C. All the base glass samples had poor acid resistance, which was greatly improved by heat treatment. When honeycomb structure α-cordierite appeared as the main crystalline phase, acid resistance deteriorated rapidly. A small amount of Fe2O3 addition reduced the acid resistance. With Fe2O3 content increasing, the acid resistance gradually improved.
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