Refractories zirconia

Table 4. Composition of Alumina, Silica, and Zirconia Refractories,...

The element is still best known, however, in the form of its oxide. Zirconia linings for metallurgical furnaces are very permanent, and, because of their low heat conductivity, may be made very thin. Zirconia refractories, such as crucibles, are very resistant to the action of heat, slags, and most acids, and may safely be plunged into water while red-hot (42). 

Zirconia Refractories. The most common zirconia-containing refractories are made from zircon sand and are used mosdy for container glass-tank subpaver brick. Refractory blocks made from a composition of zircon and alumina, used to contain glass melts, are generally electromelted and then cast. These exhibit excellent corrosion resistance but are subject to thermal shock. Refractories made from pure Zr02 are extremely expensive and are... 

Lime is also used as a bonding and stabilising agent in the production of silicon carbide and zirconia refractories [32.4]. 

Bacon Bakor. A Russian corundum-zirconia refractory for use more particularly in the glass industry the name is derived from baddeleyite (q.v.) and corundum (q.v.). There are... 

These materials offer outstanding properties, including thermal stabiUty to 2600 °C and corrosion resistance to hot aUcahs and many aggressive chemicals and melts neither are they wetted by a range of molten metals. The appUcations of zirconia refractory fibers range from highly efficient thermal insulation to separators in aerospace batteries, hot gas filters and electrolysis diaphragms (see below). 

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