Tin alloy powder for sintering
AssigneeAlcan Aluminum Corporation
InventorKrishnakant B. Patel
Life of this patent
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Abstract
A tin alloy powder containing up to 5% P is disclosed. Reduced sensitivity to sintering conditions is achieved by use of present alloy powder in production of sintered bronze articles. Means for controlling the growth of the article during sintering are also disclosed.
Claims20
A tin alloy powder comprising a major proportion of tin, about 0.1 to 5.0 weight percent phosphorus and incidental impurities.
The blend of claim 7 diluted by further blending with iron powder to produce a diluted blend comprising 20 to 80 parts of the blend of claim 7 and 20 to 80 parts of iron powder, all powders in said diluted blend having a particle size disposed to pass through a 60 mesh screen.
A method for producing a sinterable blend having a reduced sintering sensitivity comprising
- alloying tin with about 0.1 to about 5.0 weight percent phosphorous,
- atomizing said tin alloy to make a tin powder, and
- blending about 4 parts to about 30 parts by weight of said tin powder, about 70 parts to about 96 parts by weight of a copper powder and up to 20 parts by weight of a material selected from lubricant, graphite, binder and mixtures thereof to produce said sinterable blend.
A method of sintering comprising;
- preparing a blend comprising about 70 parts to about 96 parts by weight copper powder and about 4 parts to about 30 parts by weight tin powder and up to about 20 parts by weight of a material selected from lubricant, graphite, binders and mixtures thereof, compressing said blend to form a coherent compact, and sintering said compact in a non-oxidizing atmosphere at a temperature between about 1200.degree. F. and 1700.degree. F. wherein the improvement comprises preparing said blend with a tin powder comprising a major proportion of tin, about 0.1 to 5.0 weight percent phosphorous and incidental impurities.
Dependencies are inferred from the claim text.