MOST POWDERS receive at least one treatment prior to compaction. These treatments are tailored to the use of the powder and may include (a) particle size distribution adjustment through screening and/or air classifying, (b) annealing for the purpose of improving compacting properties, (c) lubricant addition for compacting grade powders, (d) mixing of different powders for premixes, and (e) blending of powders and powder mixes to homogenize their various components. These treatments are usually performed by the powder producer. The quality of these treatments can greatly affect the uniformity and consistency of sintered part properties. With increasing emphasis on zero defect manufacture, the treatments have received more attention in recent years.

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