Cast refractory

Calcined alumina is a reactive powder used to make synthetic grain. It also may be used as a bonding or fine component in batched refractory mixes, as a raw material for molten cast refractories, or for refractory casting sHps. 

Fusion-cast refractories are formed by first melting the material in an electric arc. The Uquid is poured into a mold and allowed to cool. Various annealing processes and refining techniques ensure a uniform and stmcturaUy sound shape. The case form is then cut or ground to size. 

Fused-cast refractory is very dense but may contain a system of closed pores and large, highly oriented grains may exist in a particular casting. The size and distribution of the pore and grain phases must be controlled. 

A. A. Litvakovski, Fused Cast Refractories, Israel Program for Scientific Translations, Jemsalem, 1961. 

Fusidic acid, bacterial resistance mechanisms, 3 32t Fusinite, 6 707t, 719, 828 Fusion, PVC, 25 663-664. See also Cold fusion Deuterium fusion Fusion-bonded-epoxies (FBE), 10 440 Fusion carburization, 4 674-675 Fusion-cast refractories, 21 504 shapes of, 21 481-482 Fusion method, for tin content assays, 24 791, 792... 

An alternative to silicate-based Portland cement is the calcium aluminate cement, ciment fondu, which originated with the Lafarge company in France in 1908. Ciment fondu is typically made by heating limestone with bauxite, which is mainly AIO(OH) but contains much iron oxide (see Section 17.2). As noted above, calcium aluminate hydrates and hardens much more rapidly than alite, and so ciment fondu, either as such or mixed with Portland cement, can be used whenever a rapidly setting cement is required, for example, for construction at low temperatures. Concretes made from aluminate cements remain serviceable at higher temperatures than Portland cements and so are used to make cast refractories for pyrometal-lurgical applications. 

Fusion-cast refractories are used for lining glass-tank furnaces, for electrode and bubbling blocks, for burner ports, throats, etc. Fusion-cast materials of the chromc--magnesite type are utilized in steelmaking. 

The radiant surface — including its supporting casting, refractory walls and a portion of the supporting frame and casing — costs more per square foot than does the more compact convection bank. The cheapest overall cost will be obtained if the radiant heat absorption rate is made as high as practicable. 

AI2O3, etc.. .. and for the manufacture of cast refractory blocks, abrasive and refractory grains and refractory fiber products. 

Another excellent application for anchors and hangers is in on-site rammed or cast refractory burner tiles for cases where the burner manufacturer does not provide a kiln-fired burner tile. These are usually for large burners. Figure 9.9 is a typical drawing provided by a burner manufacturer, with detailed dimensions and angles that... 

Uses Antislag coating for cast refractory lances, iron ladle pour spouts, and other ceramic refractory lines surfs, subjected to molten splash or slag build-up... 

Denker SP, Meyer J (1966) Pressure casting refractory ceramics. Rev Sci Instram 37 679-680... 

Battery Top Paving. Refractory brickwork, cast blockwork or cast refractory concrete laid or placed on the top of a coke-oven battery. 

Folded Foot. The foot of a wine glass is said to be folded if the outer edge has been raised by folding it back on itself. Font. (1) An alternative term for a void. (2). A reservoir above the mould for fusion-casting refractories molten material from the font helps to fill the... 

Fusion Casting. A process for the manufacture of refractory blocks and shapes of low porosity and a high degree of crystallinity the refractory batch is electrically fused and, while molten is cast into a mould and carefully cooled. The usual types of fusion-cast refractory are those consisting of mullite, corundum, and zirconia in various proportions such refractories find considerable use as tank blocks for glass-melting furnaces. Trials have been made with fusion-cast refractories in steel furnaces. 

A cavity at the top of a fusion-cast refractory resulting firom the contraction of the molten material as it cools. 

RO Fusion-cast Refractory. A fusion-cast refractory made in an inclined mould designed to concentrate the shrinkage cavity in one comer of the block such blocks are made in France (RO = Retassure Orient6e, i.e. oriented cavity cf. DCL, RT and SR). 

RT Fusion-cast Refractory. A refractory made by a process devised by L Electro-Refractaire, Paris, for ensuring freedom from large cavities in fusion-cast blocks, RT = Remplissage Totale (cf. DCL, RO and SR). 

SR Fusion-cast Refractory. A French fusion-cast refractory, e.g. glass-tank block, made by a process that largely eliminates the cavities that occur as a result of shrinkage while the block cools from the molten state. The block is made by a so-called high-filling process (SR = Sur-Remplis) and is then heat-treated. 

A porous or hollowed-out region, representing the last area of solidification of a fusion cast refractory. 

Yttrium Oxide. Y2O3 m.p. approx. 2450°C sp. gr. 4.84 thermal expansion (25-1500°C) 9 X 10-6. An oxide extracted from MONAZiTE (q.v.) though not itself, strictly, a rare earth. An infra-red transmitter in the wavelength range 1 to 8 pm. ZAC Block. A zirconia alumina fusion-cast refractory, resistant to corrosion in glass tanks. 

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