学术论文

      Steel Fiber Toughening Mullite-SiC Castables for Coke Dry Quenching Furnace Corbel Pillar

      Abstract:
      The mullite-SiC castables for coke dry quenching (CDQ) furnace corbel pillar were prepared by taking mullite and silicon carbide as aggregates,silicon carbide powder,fused silica powder,α-Al2O3 powder and silica fume as matrix,calcium aluminate cement as binding system,and extra-adding steel fibers to extend the CDQ furnace refractory life.The effects of steel fiber types (melt pumping meniscus,cut straight,wavy indentation,cold-drawn hook) and steel fiber extra-additions (0,1%,2%,3% by volume) on the properties of mullite-SiC castables were investigated.Then the toughening mechanism of steel fiber in the castables was analyzed according to the load-displacement curves.The results show that:(1) the toughening effects of the melt pumping meniscus steel fiber with rough surface and colddrawn hook steel fiber with strong anchoring effect with the matrix are better than those of cut straight steel fiber and wavy indentation steel fiber;(2) the suitable amount of steel fiber (less than 2%) in mullite-SiC castables not only significantly improves the mechanical properties,thermal shock resistance and wearing resistance,but also improves the fracture energy by 49.0% and slows the crack growth;(3) the bond strength and mechanical anchoring force between steel fiber and castable interface are key elements of steel fiber reinforced castables.
      Author: NI Kangxiang [1] ZHANG Meijie [1] GU Huazhi [1] HUANG Ao [1] LI Hongming [2] SHAO Zhijun [2]
      作者单位: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China Yixing Furnace Roof Sealer Industry Co., Ltd., Yixing 214225, China
      年,卷(期): 2017, 26(1)
      在线出版日期: 2017年4月18日