Abstract: Brass powder metallurgy compositions for use in manufacturing a brass part by powder metallurgy techniques. The compositions comprise from about 70-90% wt. copper, 10-30% wt. zinc, and from about 0.1-1.5% wt. graphite as an addition to improve the machinability of the resultant compacted brass part. The compositions preferably contain less than 2% wt. lead.

Abstract: A powdered metallurgical composition comprising copper and zinc, which composition also includes a proportion of 0.1 to 1.5% by weight of graphite to improve the machinability of an article made from the composition.

Abstract: An infiltrant product composition is disclosed for impregnating an iron powder compact. The infiltrant alleviates typical problems associated with use of infiltrating materials, including partial dissolution of iron base matrix by the infiltrant with consequent severe erosion, oxidizing or reducing effects of furnace atmospheres on infiltrant yield, and incompatible characteristics of infiltrant with the iron base matrix. The preferred infiltrant composition is by weight about 98.25% copper alloy and 1.75% carbonyl type iron powder. An additional 0.05% of aluminum to reduce residual formation and minimize residual adherence and 0.5% of a conventional lubricant based on the copper-iron mixture are added. The infiltrant is in a dry, compactible form.

Abstract: A non-ferrous powder formed of a prealloy of copper, tin and zinc, the present article of manufacture exhibits sufficient green strength to allow direct compacting and sintering of useful articles from the "as atomized" form. The present prealloy powder is preferably air atomized from an alloy of copper, tin and zinc, the respective nominal weight percents of the components in the resulting prealloy powder being 89%, 9% and 2%. The present prealloy powder is preferably lubricated with conventional dry organic lubricants and can optionally be blended with carbonyl iron, carbonyl iron nominally comprising 1.0% to 3.0% by weight of the powder.