Home » Technologies & Materials » Iron and Steel » Investigation of the Tendency for Failure of Refractory Castables in the Wear Lining of a Steel Ladle Using Elongated or Cubic Shaped Tabular Alumina

Investigation of the Tendency for Failure of Refractory Castables in the Wear Lining of a Steel Ladle Using Elongated or Cubic Shaped Tabular Alumina

However, due to the arising of complex states of stresses during operation, the prediction of the failure of complex refractory structures, such as linings, is no easy task. On the one hand, refractory materials, like most ceramic materials, tend to be weak in tension but strong in compression. On the other hand, very complex stress distributions are generated in refractory structures under operation. Consequently, no simple and single strength thresholds, such as the tensile or compression strength, can be used in a straightforward and obvious manner. Failure thresholds considering complex multiaxial state of stress need to be implemented. As one of the pertinent failure criteria for refractory structures, the Drucker-Prager criterion was derived from uniaxial compression and diametral compression tests and applied to an exemplary model. Focus was laid on the investigation of the tendency for failure of a high alumina monolithic wear lining in a steel ladle during its first heating up. Especially, the impact of using either splintered or cubic tabular alumina in the coarse fraction of the monolithic was studied.
First critical stresses seemed to appear already in the middle of the pre-heating of the steel ladle, i.e. above 500 °C. Using splintered tabular alumina enhanced the cohesion of the castable and improved the resistance to failure of the lining in operation.


Related Supplier

Profiles to follow