Refractory bricks fired at extremely high temperatures exhibit ______________?
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Answer: A. Greater resistance to corrosion by slags
Explanation
Refractory bricks fired at extremely high manufacturing temperatures develop greater density and chemical resistance. Higher firing temperatures reduce porosity, preventing corrosive molten slags from penetrating the brick structure. This enhanced microstructural vitrification significantly improves the operational lifespan of furnace linings. Refractories are heat-resistant ceramic materials used to line high-temperature industrial furnaces and kilns. Kiln firing promotes solid-state diffusion and ceramic bonding between raw mineral particles within the brick. Minimizing pore space blocks corrosive liquid fluxes from attacking internal grain boundaries.
Steelmaking vessels and metal smelting furnaces demand highly corrosion-resistant refractory brick linings. Extending furnace campaign lengths reduces costly downtime and refractory replacement expenses. Manufacturers carefully control kiln firing schedules to achieve optimal density and mechanical strength. Stating that higher firing temperatures yield less resistance to slag corrosion contradicts established ceramic science. High spalling tendency is generally reduced by proper firing and microstructure control rather than increased vulnerability. Option D is incorrect because increased firing temperature provides clear, well-documented benefits to slag resistance.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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