An experimental investigation of metal powder compaction at elevated temperature

• Published in: Mechanics of materials Vol. 41; no. 5; pp. 553 - 560
• Main Authors: Rahman, M.M., Nor, S.S.M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.05.2009; Elsevier
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Inelasticity (thermoplasticity, viscoplasticity...); Materials science; Materials synthesis; materials processing; Physics; Solid mechanics; Structural and continuum mechanics; Die; Metal powder; Mechanical properties; Forming; Iron; High temperature; Experimental study; Powder metallurgy; Green function; Optimization; Lubricant; Powder technology; Powder compact; Powder compaction; Lubrication; T shape; Room temperature
• ISSN: 0167-6636; 1872-7743
• DOI: 10.1016/j.mechmat.2008.12.003

The warm compaction process was initiated in the nineties and found that metal powder formed at elevated temperature gives significant impact on the entire compaction process and the quality of the green compact as well as the final product. Mechanical properties of green compact are largely influenced by the forming temperature, lubricant and lubrication mechanism, and loading condition. This paper presents the powder compaction study from experimental investigation covering full scale compaction phases. The optimum forming temperature, amount of lubricant content, and loading conditions are also presented. Several experiments have been conducted using T-shape die to generate green compacts from iron powder. The forming temperature has been ranged from room temperature (30 °C) to 150 °C. Finally, the generated green compacts are tested mechanically to justify the mechanical properties. It has been found that the optimum forming temperature for iron powder is about 130–150 °C whereas the lubricant content is about 0.5 wt%.