When to Use Melt Extract Steel Fiber？

Refractory clays used in ceramics manufacturing

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Fire clay in a furnace

Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium (Al2O3·2SiO2·2H2O) with or without free silica."[1]

Properties

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High-grade fire clays can withstand temperatures of 1,775 °C (3,227 °F), but to be referred to as a "fire clay" the material must withstand a minimum temperature of 1,515 °C (2,759 °F).[2] Fire clays range from flint clays to plastic fire clays, but there are semi-flint and semi-plastic fire clays as well. Fire clays consist of natural argillaceous materials, mostly kaolinite group clays, along with fine-grained micas and quartz, and may also contain organic matter and sulphur compounds.

Fire clay is resistant to high temperatures, having fusion points higher than 1,600 °C (2,910 °F); therefore it is suitable for lining furnaces, as fire brick, and for manufacture of utensils used in the metalworking industries, such as crucibles, saggars, retorts and glassware. Its stability during firing in the kiln means that it can be used to make complex items of pottery such as pipes and sanitary ware.

Chemical composition

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The chemical composition typical for fire clays are 23-34% Al2O3, 50-60% SiO2 and 6-27% loss on ignition together with various amounts of Fe2O3, CaO, MgO, K2O, Na2O and TiO2.[2] Chemical analyses from two 19th-century sources, shown in table below, are somewhat lower in alumina[3][4] although a more contemporary source quotes analyses that are closer.[5]

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Fire clay compositions Thorpe[3] King[4] Shackelford[5] Stonebridge Eisenberg I Eisenberg II Newcastle 1 Newcastle 2 Newcastle 3 N/A SiO2 (%) 65.10 89.8 64.7 51.1 47.6 48.6 58.1 Al2O3 (%) 22.2 5.40 24.0 31.4 29.5 30.2 23.1 MgO (%) 0.18 0.09 0.40 1.54 0.71 1.91 1.00 CaO(%) 0.14 0.20 0.37 1.46 1.34 1.66 0.08 Iron Oxides (%) 0.18 0.09 0.40 4.63 9.13 4.06 2.40 K2O (%) 0.18 0.61 2.40 not given in the text

Extraction

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Unlike conventional brick-making clay, some fire clays (especially flint clays) are mined at depth, found as a seatearth, the underclay associated with coal measures.

References

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Melt extract stainless steel fiber has excellent heat-resistant and better dispersion.

Melt extract stainless steel fibers are pliable and ductile product. They are both allow for more user-friendly than the stiff cut fibers and also have better flow features.

Melt extract stainless steel fiber features superior shock resistance, steep thermal gradients resistance and mechanical shock resistance, thus they can reduce the damage and cracking. Melt extract fibers are ideal refractory material that used in fire clays and torpedo ladle and also precasting concrete and situ and repair concrete due to their performance in thermal shock resistance.

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