Impact of preheating on the mechanical performance of different MgO–C bricks - Low temperature range

GASS, SEBASTIÁN E.; GALLIANO, PABLO G.; TOMBA MARTINEZ, ANALÍA G.

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Año: 2021

0272-8842

This work complements an initial study regarding the mechanical behavior of MgO?C bricks at 1000 ◦C. In thiscase, two bricks bonded with phenolic resin, one of them containing aluminum, were treated at 600 ◦C andmechanically tested at RT and 600 ◦C. The thermal treatments attempt to simulate the in-service steelmakingladle preheating process. At low temperatures, the binder pyrolysis is one of the main transformations and the Almelting neither its chemical reactions occur on a large scale yet. To evaluate the effects as the pyrolysis progresses,the soaking time at 600 ◦C was varied from 1 to 3 h. Although without significant chemical activity, thepresence of Al affected the mechanical behavior of the tested bricks. The consolidation of the C?C networkcoming from the binder pyrolysis was identified as the main factor responsible for counterbalancing the material?sdegradation by microcracking. The heating combined with the low compressive pre-load applied on thetested specimens appears to close the microcracks and pores.