ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Powder compaction is a well-established process for manufacturing a wide range ofproducts, including engineering components and pharmaceutical tablets. During powdercompaction, the compacts (green bodies or tablets) produced need to sustain their integrity duringthe process and possess certain strength. Any defects are hence not tolerable during the production.Therefore, understanding failure mechanisms during powder compaction is of practicalsignificance. In this paper, the mechanisms for one typical failure, capping, during the compactionof pharmaceutical powders were explored. Both experimental and numerical investigations wereperformed. For the experimental study, an instrumented hydraulic press (a compaction simulator)with an instrumented die has been used, which enable the material properties to be extracted for realpharmaceutical powders. Close attentions have been paid to the occurrence of capping during thecompaction. An X-ray Computed Microtomography system has also used to examine the internalfailure patterns of the tablets produced. Finite element (FE) methods have also been used to analysethe powder compaction. The experimental and numerical studies have shown that the shear bandsdeveloped at the early stage of unloading appear to be responsible for the occurrence of capping. Ithas also been found that the capping patterns depend on the compact shape
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.237.pdf
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