Refractory Fiber Bonding

Ceramic shapes made in this way have excellent insulating characteristics and relatively low weight when compared to firebrick types of insulation. Fiber bonded refractories also have very good thermal shock characteristics. 

While kilns made of firebrick have done the job for centuries, fiber insulation has an advantage in weight. The same level of insulation can be achieved with much less weight of refractory fiber insulation than firebricks. 

The larger thermal mass of the firebricks requires that a kiln made with bricks must be pre-heated much longer (requires more energy input) to come to the same temperature compared to the kiln insulated with fiber insulation. Also, fiber insulation is less prone to thermal shock during heating or cooling than firebricks. 

In some cases the colloidal silica is used at fairly high concentration in the water phase without the addition of 

A form is constructed of screen material fine enough to allow the liquid to pass but which will trap the bulk of the fibers. 

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Refractory Fibers Recently, zirconia-based insulating material with a low density and a low thermal conductivity has been developed in the form of fibers, paper, felt, board and shaped articles. The material is a cubic zirconia soHd solution stabilized with yttria, and has a maximum usable temperature of >2100 C. The innovative fabrication technique involves the use of an organic precursor fiber as a structural template, impregnated with an aqueous solution of zirconium chloride and yttrium chloride. The metallic salts are deposited within the organic fiber, which can subsequently be burned off by a controlled oxidation. The hollow remainder is then fired at a sufficiently high temperature (800-1300 °C) so as to induce crystallization, after which the oxide particles are sintered to develop a ceramic bond. Other techniques to produce refractory fibers involve phase inver-... 

Use Binder for carbon electrodes, base for paints and coatings. Impregnation of fiber pipe for electrical conduits and drainage, foundry core compounds, briquetting coal, tar-bonded refractory brick, paving and roofing, plasticizers for elastomers and polymers, extenders, saturants, impregnants, sealants. 

The definition for an unshaped refractory is given in ISO 1927 (5) and EN 1402-1 It is a mixture, which consists of an aggregate and a bond or bonds, prepared ready for use either directly in the condition in which it is supplied or after the addition of a liquid that satisfies the requirements on refractoriness given in ISO R 836. They may contain metallic, organic, or ceramic fiber material. This mixture is either dense or insulating. An insulating mixture is one whose true porosity is not less than 45% when determined in accordance with EN 1094-4, using a test piece prefired to specified conditions. 

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