Measuring of capping phenomena in powder compaction process using X-ray computed tomography

M. Suzuki a, Y. Tanakaa, K. Iimuraa , H. Satonea and K. Ishiib

aDepartment of Mechanical System Engineering, University of Hyogo, Japan

b Japan Atomic Energy Agency

Abstract

The capping phenomenon means the powder adheres to the piston at the powder compression process and is one of the important causes of the powder molding trouble. The capping phenomena were difficult to discover in a compression molding process. The capping region can be detected from X-ray computed tomographic images and slipping angle of the capping area can be measured. From the experimental results, it?s clear that the capping phenomena easy to occur in the case of wider size distributed granules. So the capping phenomena can be prevented to use coarser mono-sized granules for compression molding.

Keywords: Capping phenomena, Powder packing process, Piston compression, Powder Crack, X-ray CT