Powders and powdered materials are finely divided or powdered forms of metals, ceramics, polymers, composites, minerals or other raw materials. There are several types of powders and powdered materials. Examples include powdered metal, metallurgy powders, alum powders, ceramic powders, and powder coat paints. Many industrial powders include forms of powdered metal that provide a scratch-resistant heavy duty coating. Metallurgy powder uses a sintering process for making various parts out of metal powder. Alum powder is used to cause suspended solids in water to be coagulated and subsequently filtered or vacuumed out. Ceramic powder is used in chemical engineering for applications requiring temperature, corrosion, and wear resistance. Powder coat paint is a relatively hard, abrasion resistant, and tough. Powder coat paint is often used in the automotive industry. Other powders and powdered materials are commonly available.
Powders and powdered materials are used in many different ways. Powder coating materials are an advanced method of applying a decorative and protective finish to a wide range of materials and products. Powder coatings are mixtures of finely ground particles that are then sprayed onto a surface. The charged powder particles adhere to the electrically grounded surfaces until heated. They are then fused into a smooth coating in a curing oven. Metallurgy powder is a type of powdered metal that is compacted in a closed metal cavity or die under pressure. Compacted powdered metals are placed in an oven and sintered in a controlled atmosphere at high temperatures until they coalesce and form a solid. Alum powder can be used as a cross-linking agent in organic compounds. High energy bead milling (HEBM) is used to produce ceramic powder and was developed for lead-based materials such as PZT and PMN. Ceramic powders are usually made of alumina, aluminum oxide, or silicon carbide. Applying powder coat paint involves three steps: pretreatment for removing lubricating oils from surface, coating of powder coat enamel applied in automated electrostatic spray booth, and baking finish to hard surface.
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Engineering Web: Powders and Powdered Materials
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