HIGH ALUMINA CONTENT REFRACTORY COMPONENTS IN CORPORATING A SIALON BINDER

摘要

FIELD OF THE INVENTION The present invention relates to the field of refractory parts, in particular slide gate closure devices, of a device for jetting or blocking steel, characterized in that it is made of a refractory material essentially containing a) and b).;a) 61 to 77 wt% of grain having a melting point of 1800 ° C. or more and an alumina content of 50 wt% or more;;b) 39-23 wt% of the binder phase showing in the X-ray pattern the same lines as the characteristic lines of sialon of the structural formula Si _6-Z Al _Z O _Z N _8-Z in the range z to 2.5-4.