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Published on: May 11, 2017
Optimization of Properties for Alumina-Spinel Refractory Castables by CMA (CaO-MgO-Al2O3) Aggregates
Hai Tang1, Chunxue Li2, Jianying Gao2
1The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
This study introduces a novel porous calcium-magnesium-aluminum (CMA) aggregate to enhance alumina-spinel refractory castables. The CMA aggregate significantly improves thermal shock and fatigue resistance, with optimal particle size enhancing slag resistance.
Area of Science:
- Materials Science
- Ceramic Engineering
- Refractory Materials
Background:
- Alumina-spinel refractory castables are crucial in high-temperature industrial applications.
- Optimizing their properties, such as thermal shock and slag resistance, is essential for performance and longevity.
- Novel aggregate materials offer a pathway to enhance refractory castable performance.
Purpose of the Study:
- To investigate the effect of incorporating a novel porous calcium-magnesium-aluminum (CMA) aggregate on the properties of alumina-spinel refractory castables.
- To evaluate the influence of CMA aggregate particle size on castable performance.
- To determine the potential of CMA aggregates for optimizing refractory castable characteristics.
Main Methods:
- Partial replacement of coarse corundum particles with CMA aggregate particles of similar size.
- Comparative evaluation of bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance, and thermal fatigue resistance.
- Analysis of the impact of CMA aggregate particle size on material properties.
Main Results:
- Incorporation of CMA aggregates significantly enhances thermal shock resistance and thermal fatigue resistance.
- A slight decrease in bulk density and strength was observed with CMA aggregate addition.
- Appropriate CMA aggregate particle size improved slag penetration resistance.
- The overall performance enhancement was strongly dependent on the particle size of the CMA aggregate.
Conclusions:
- Novel porous CMA aggregates can effectively improve the thermal performance of alumina-spinel refractory castables.
- CMA aggregates offer a viable strategy for enhancing resistance to thermal shock and fatigue.
- Optimizing CMA aggregate particle size is critical for maximizing benefits, including improved slag resistance, while managing trade-offs in density and strength.
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