摘要:
A cement free refractory mixture contains aluminum oxide, silicon carbide, fumed silica, aluminum metal, an anti-oxidant, reactive alumina, and a carbon-bearing material. The mixture can be formed by conventional techniques to create refractory articles to contain or direct the flow of liquid metals. Refractory articles formed by the mixture do not require firing to achieve an initial cure.
摘要:
A cement free refractory mixture contains aluminum oxide, silicon carbide, fumed silica, aluminum metal, an anti-oxidant, reactive alumina, and a carbon-bearing material. The mixture can be formed by conventional techniques to create refractory articles to contain or direct the flow of liquid metals. Refractory articles formed by the mixture do not require firing to achieve an initial cure.
摘要:
A method of applying a cement-free refractory castable to the surface of a refractory structure, comprising the steps of:a) preparing an intimately mixed refractory castable having alumina aggregate and a cement-free binder comprised of hydratable alumina;b) conveying the refractory castable under pressure through a delivery hose to a dispensing nozzle for applying the refractory castable; and,c) adding a salt solution to the refractory castable prior to application by the nozzle at a rate wherein the salt solution comprises about 0.2% to 0.9% by weight of the refractory castable applied by the dispensing nozzle.
摘要:
A method of applying a refractory castable material to the surface of a structure comprising the steps of thoroughly mixing a refractory castable material comprised primarily of aggregate and a cementitious binder; conveying the refractory material under pressure through a delivery hose to a dispensing nozzle; and adding hydrated lime to the refractory castable material prior to application by the nozzle.
摘要:
A method of applying a refractory castable onto a surface of a refractory structure, comprising the steps of: [a)] preparing a thoroughly mixed wet castable for application onto a surface of a refractory structure; [b)] conveying the wet-mixed refractory castable at a set rate under pressure through a delivery hose having a predetermined cross-sectional area to a dispensing device having an air inlet and a dispensing nozzle; [c)] introducing air under pressure into the dispensing device, wherein the air pressure ranges from about 20 psi to about 80 psi and wherein the air has a velocity of about 177 ft/sec at 20 psi and an air velocity of about 484 ft/sec at 80 psi and wherein the velocity increases by about 5 ft/sec for every unit increase in the pressure.
摘要:
A method of applying a high alumina, low cement refractory castable to the surface of a refractory structure, comprising the steps of:a) preparing an intimately mixed castable for application onto the surface of a refractory structure, the refractory castable including by weight the following components:80% to 86% alumina aggregate,about 6% to 11% thermally reactive calcined alumina,about 4% to 8% calcium aluminate cement;b) conveying the refractory castable under pressure through a delivery hose to a dispensing nozzle for applying the refractory castable; andc) adding calcium chloride to the refractory castable prior to application by the nozzle at a rate wherein the calcium chloride comprises about 0.05% to 0.15% by weight of the refractory castable applied by the dispensing nozzle.
摘要:
A process for applying a refractory castable onto a surface, comprising the steps of: (a) introducing metered amounts of a clay-free, dry refractory castable into a delivery hose, the dry refractory castable having an alumina content of about 40-95%; (b) conveying the dry refractory to a dispensing assembly under pneumatic pressure; (c) introducing water and a set modifying admixture into the dry refractory prior to dispensing the refractory castable from the dispensing assembly; and (d) spraying the hydraulic refractory castable onto a surface.
摘要:
A phenol formaldehyde resin in liquid form is used as a binder for an aggregate refractory composition. The resin has a viscosity at 25.degree. C. of up to about 3000 cps.