Properties of Low-Carbon Al₂O₃-C Refractories with Different Critical Particle Size

Abstract:

Low-carbon Al2O3-C refractories were prepared using white fused corundum, α-Al2O3 powders and flake graphite as main raw materials. The critical particle sizes of corundum selected in this experiment were 0.5mm, 1mm and 2mm. The effects of corundum critical particle size on physical, mechanical and thermo-mechanical properties of low-carbon Al2O3-C refractories were investigated. The results show that the increase of critical particle size is conducive to the improvement of thermal shock resistance and fracture energy, but little effect on thermal expansion. The cold modulus of rupture after thermal shock test of samples using 0.5mm critical particle size corundum was 2.09MPa, while using 2mm critical particle size corundum was 2.98MPa. And the fracture energy increased from 265N/mm to 588N/mm when the critical particle size increased from 0.5mm to 2mm. The effects of critical particle size on apparent porosity, bulk density and modulus of rupture were insignificant.

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 318-321
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.318
• Online since: November 2012
• Authors: Chong Chong Niu, Guo Qi Liu, Xiao Xian Wu, Jian Bin Yu, Hong Bin Qin
• Keywords: Critical Particle Size, Fracture Energy, Low-Carbon Al₂o₃-C Refractories, Thermal Expansion, Thermal Shock Resistance

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