Journal of Iranian Ceramic Society
Journal of Iranian Ceramic Society
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Meybod University , hadi.merc@gmail.com
Abstract: (443 Views)
Casting nozzles play a crucial role in open continuous casting systems. Their varying diameters help control the flow and speed of the casting process. Zirconia casting nozzles, a type of engineering ceramics, demonstrate high resistance to corrosive materials. This research investigates the mechanisms, causes, and processes behind the degradation of these nozzles. Microstructural analyses using SEM-EDS revealed that in a sample exposed to molten metal for 120 minutes, iron, oxygen, and calcium showed the highest presence in the zirconia grain boundaries. However, the weight percentages of these elements remained largely unchanged between the raw and degraded samples. This suggests that element penetration did not originate from the molten metal; rather, the degradation and defects stem from the nozzle's inherent properties and the conditions of the casting process. Additionally, the degree of cracks and porosity in the nozzles is directly linked to their overall defectiveness, an important factor to consider in any proposed solutions.
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