—   Castable refractories are made by mixing refractory aggregate of suitable grading, such as alumina-silicates or high alumina, with a refractory high-alumina cement and water to desired consistency. The mix is then either cast, rammed, gunned or sprayed into ...

—Refractoriness is the ability of a material to withstand the action of heat without appreciable deformation or softening under parti­cular service conditions. —The refractoriness of refractory materials depends on their chemical and mineralogical composition, on their dimensional stability on heating, and ...

—The superalloys have superlative combinations of properties. Most are used in aircraft turbine components, which must withstand exposure to severely oxidizing environments and high temperatures for reasonable time periods. Mechanical integrity under these conditions is critical; in this regard, density ...

—   Metals that have extremely high melting temperatures are clas­sified as the refractory metals. Included in this group are niobium (Nb), molybdenum (Mo), tungsten (W), and tantalum (Ta). Melting temperatures range between 2468°C for niobium to 3410°C, the highest melting ...

The chief consumers of refractories are such industries as: Iron and steel Non ferrous metals Steam and power Oil refining Glass and pottery Cement, lime and other minerals, and Chemicals.

(i) Refractories are obtained from ores of Silica or those of Silica and Alumina. (ii) After mining or chemical production and calcining, refractory materials are crushed, ground and prepared to size. They are then mixed with other materials and shaped as ...

 Refractories may be grouped into following three categories: 1. Acid Refractories. 2. Basic Refractories. 3. Neutral Refractories. 1. Acid Refractories. They are Type                                             ...