Warm compaction powder metallurgy of Cu
(Guangdong Key Laboratory for Advanced Metallic Materials Processing,
College of Mechanical Engineering, South China University of Technology,
Guangzhou 510640, China)
College of Mechanical Engineering, South China University of Technology,
Guangzhou 510640, China)
Abstract: A series of experiments were carried out using different admixed lubricant contents, different compaction pressures and temperatures in order to study the warm compaction of copper powder. Results show that too much admixed lubricant will lead to the squeeze out of the lubricant from the compact during the warm compaction processing of Cu powder. Results also show that blisters can be found in sintered samples that contain lubricant less than 0.15%(mass fraction). Optimal warm compaction parameters for producing high density powder metallurgy copper material are obtained. Compacts with green density of 8.6g/cm3 and a sintered density of 8.83g/cm3 can be produced by warm compacting the Cu powder, which contains 0.2% admixed lubricant, and is compacted at 145℃ with a pressure of 700MPa.
Key words: powder metallurgy; copper; warm compaction