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Silicon Carbide, FFF mesh - 1 lb.
Silicon Carbide is a non oxide ceramic and is used in a wide range of products that must perform in thermally (heat shock) and mechanically demanding applications. It is employed in both abrasives and wear resistant parts for its hardness; in refractories and ceramics for its resistance to heat and low thermal expansion; and in electronics for its thermal conductivity and other properties. The only materials harder than SiC are boron carbide and diamond. SiC parts can be fabricated in a variety of ways. Hot pressed and reaction bonded parts are usually porous, non-homogeneous and less thermally conductive and shock resistant. By contrast single crystal SiC has optimal properties but is very expensive to make. CVD furnaces, on the other hand, can be used to make solid pure SiC parts that are uniform and dense. Surprisingly, 100% SiC powders can also be cast using the traditional slurry deflocculation and plaster casting method (provided that a very fine grade SiC powder is employed). SiC cast parts separate best from completely dry molds and special measures may be needed to get the dispersant to mix in properly. SiC casting mixes can also contain some plastic clay to affect better suspension and enable using a coarser grade of material (for refractory setters, for example). Items need to be fired to 1500C. In ceramics the most common use of SiC is for high heat duty kiln shelves. But this material is increasingly being used to make a wide range of products having low expansion, high heat endurance and resistance to abrasion. SiC powder has some curious uses in ceramic glazes. It is employed to make crater and foam glazes. The silicon part takes up available oxygen to make SiO2 and the carbon combines with oxygen to make CO2 that creates the blisters and bubbles. This mechanism is also useful to create reduction effects in oxidation firings. The carbon that silicon carbide particles release acts to reduce metallic oxides like iron and copper (however larger amounts of SiC increase the danger of blisters in non fluid melts). Additions of tin oxide will aid color development, especially for copper reds. Source: Digital Fire.
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