Abstract: Corrosion resistance to slag of in-situ TiN/O′-Sialon was investigated by means of static droplet method and was compared with that of other materials, under simulating conditions of BF cohesive zone slag. Phase composition of the residue slag was analyzed by X-ray diffraction. For corroded region of materials, microstructure, element distribution and corrosion depth were observed and determined by electro-probe microanalysis. The results show that after being corroded, the structure of TiN/O′-Sialon material is composed of slag zone, penetrated zone and unchanged zone. With the increasing TiN content in the material, corrosion depth decreases and both slag zone and penetrated zone narrow down, which implies an improved corrosion resistance to slag. TiN/O′-Sialon shows a more excellent corrosion resistance to slag compared with O′-Sialon and ZrO2/O′-Sialon. Corrosion depth i.e., corrosion extent of TiN/O′-Sialon increases with increasing corroding temperature, holding time and FeO content in slag. Among the three factors, corroding temperature exhibits more dramatic effect.
Corrosion resistance to slag of in-situ TiN/O′-Sialon composites
Abstract:
Corrosion resistance to slag of in-situ TiN/O′-Sialon was investigated by means of static droplet method and was compared with that of other materials, under simulating conditions of BF cohesive zone slag. Phase composition of the residue slag was analyzed by X-ray diffraction. For corroded region of materials, microstructure, element distribution and corrosion depth were observed and determined by electro-probe microanalysis. The results show that after being corroded, the structure of TiN/O′-Sialon material is composed of slag zone, penetrated zone and unchanged zone. With the increasing TiN content in the material, corrosion depth decreases and both slag zone and penetrated zone narrow down, which implies an improved corrosion resistance to slag. TiN/O′-Sialon shows a more excellent corrosion resistance to slag compared with O′-Sialon and ZrO2/O′-Sialon. Corrosion depth i.e., corrosion extent of TiN/O′-Sialon increases with increasing corroding temperature, holding time and FeO content in slag. Among the three factors, corroding temperature exhibits more dramatic effect.