B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 1/00 (2006.01)
Patent
CA 2265098
This invention relates to a method for producing sintered parts of aluminum or aluminum alloy with improved mechanical properties using batch degassing, die compaction and liquid phase sintering. The batch degassing consists of holding a prealloyed aluminum powder at a temperature of about 350° to about 450°C in a stainless steel autoclave in which the pressure is reduced to less than 5 x 10-6 torr. Once the desired pressure is reached the powder is cooled down within the autoclave while still under vacuum. The resulting powder is then compacted at a pressure of 20 to 50 tsi at between room temperature and about 250°C, but preferably at a warm temperature of about 65°C. The final densification is completed by liquid phase sintering in argon atmosphere at 625°C. This method allows the production of sintered compacts characterized by a density close to 97% of theoretical, which makes it possible to eliminate the need for a hot working step.
Pelletier Sylvain
Ziani Abdelouahab
Anderson J. Wayne
National Research Council Of Canada
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