Thermal Fatigue Behavior of Ladle Purging Plug
The thermal fatigue behavior of alumina-magnesia based and alumina-chromia based purging plug materials are comparatively studied. By comparing thermal shock parameters, the changes of elastic modulus and hot modulus of rupture after thermal shock cycles, we come to a conclusion that microcracks emerge in the alumina-magnesia based material, which hinder the crack growth during thermal shock cycles. The fine-grained and network structure of alumina-magnesia based material are also helpful to improve thermal shock resistance. However, cracks are difficult to form in the alumina-chromia based material but it tends to fracture damage quickly once the cracks nucleation due to coarse-grained structure of alumina-chromia based material.
Wei Pan and Jianghong Gong
H. Zhang et al., "Thermal Fatigue Behavior of Ladle Purging Plug", Advanced Materials Research, Vols. 105-106, pp. 158-161, 2010