The idea of using metal particulates for consolidation into useful product forms has been explored for ages, before furnaces were developed that could exceed the melting point of metals. A classical example is the sponge iron used by the Egyptians around 3000 B.C. for making tools. Since the beginning of modern powder metallurgy in the 19th century, initiated by producing compact platinum from platinum sponge powder, the role of metal powders has experienced a continuous increase. Today, powder metallurgy represents well-established industrial technology, providing not only high quality intricate shapes, but also unique material microstructures. As opposed to particulates with tens or hundreds of micrometers, required in powder metallurgy, relatively coarse ones with a size of the order of several millimeters have been used for decades in a variety of chemical, pharmaceutical, military and metallurgical applications. The latter type became a precursor of the feedstock for injection molding. The particulates are also called chips, granules or pellets, depending on their shape and manufacturing technique. So far, the material choice is restricted to low-melting point alloys—mainly to Mg-based, Zn-based and Al-based compositions.
KeywordsMagnesium Alloy Injection Molding Rapid Solidification Mechanical Fragmentation AZ91D Alloy
Unable to display preview. Download preview PDF.
- 1.Hostetler D Metal injection molding. US Patent 6,350,328 B1, 26 Feb 2002Google Scholar
- 2.Das SK, Chang CF (1985) In SK Das, CM Kear, CM Adams (eds) Rapidly solidified metallic alloys, TMS, Warrendale, PA p 137Google Scholar
- 3.Avedesian MM, Baker H (eds) (1999) Magnesium and Magnesium Alloys. ASM International, Materials Park, OHGoogle Scholar
- 4.Busk Z (1984) In Metals Handbook. 9th ed. ASM International, Materials Park, OH, p 131Google Scholar
- 5.German RM (1994) Powder metallurgy science. MPIF, Princeton, NJGoogle Scholar
- 6.Saxena S (1995) Apparatus for production of metal granules. US Patent 5,402,992, 4 Apr 1995Google Scholar
- 7.Ghosh DS, Olsen KP (2000) Apparatus and method for the formation of uniform spherical particles. US Patent 6,162,377, 19 Dec 2000Google Scholar
- 14.Kjar A et al (1996) Particulate feedstock for injection molding. US Patent 5,777,546, 26 Nov 1996Google Scholar
- 15.Dworog A (2002) Grundlagen of Magnesiumspritzgiessens. Shaker Verlag, AachenGoogle Scholar
- 16.Czerwinski F (2005) Coarse particulates—a new material precursor for net shape forming. International Journal of Powder Metallurgy 41(1):64–70Google Scholar
- 18.Czerwinski F (2005) Injection molding feedstock—a niche market for magnesium industry. Metall 59(6):376–381Google Scholar