Thermoplastic properties of corundum refractories

Means of increasing the service reliability of high-alumina slide gate plates

“…For example, the KP-95 plates are made up of crystals of corundum between which the glassy phase is uniformly distributed. The quantity of glassy phase (7-8 wt.%) and the character of its distribution are similar in the grain and binder portions of the charge [2,4].…”

“…For example, the KP-95 plates are made up of crystals of corundum between which the glassy phase is uniformly distributed. The quantity of glassy phase (7-8 wt.%) and the character of its distribution are similar in the grain and binder portions of the charge [2, 4].In the MKTsP-82 plates the same quantity of glassy phase is concentrated in the grains of the filler while in the binder portion of the charge the glassy phase is present only in the form of separate drop inclusions [2].The structure of the KTsMKhP-90 plates and of the inserts of the MKSPK-90 plates is characterized by the minimum (about 1.3%) content of glassy phase in the form of separate drop inclusions in the grains of the filler and in the binder [4].Such a distribution of the glassy phase in the plates is the result of technical features of their production. The KP-95 plates are produced according to a briquette method *At present, plates of CZ composition are designated type and composite plates types MKSPK-90, KSPK-90, and others, depending upon the material of the base…”

“…Therefore the basic factor in the technical search for the optimum material is transfer of the glassy phase from the binder portion of the charge to the granular constituent (MKTsP-82) and, finally, practically complete liquidation as the result of transition to solid-phase sintering (KTsMKhP-90, inserts of MKSPK-90 plates) [2,4].…”

Influence of complex oxide additives on the structure and technical properties of corundum refractories

“…The introduction of 5-i0% (volume) ZrO 2 to the bonding part of the refractory batch having a granular structure creates a network of mierocracks on the boundaries of the grains, and thereby increases the thermal-shock resistance of the material; in this case the additives contained in the sintered corundum considerably influence the strength and thermalshock resistance of the material [8,12,13].…”

Thermal action of molten steel on the surface layer of refractories

“…This is apparently the result of the significantly greater limiting deformation until failure of the two latter materials [i0], which is related to the method of addition to their composition of zirconium dioxide [Ii,12].…”