Jun Yaokawa *, Koichi Anzai ** Youji Yamada ***
Hiroshi Yoshii *** and Hiroyuki Fukui ***
Development of high strength water-soluble salt cores is required for manufacturing undercut
shaped products by die casting. In this study, the strength of potassium chloride core composites
reinforced by ceramic particles or whiskers was evaluated by the 4-point support bending test.
Moreover, castability was examined by surface roughness observations and X-ray tests of internal
As a result, it was found that the strength of salt cores can be enhanced by increasing the
ceramic content. For potassium chloride with AlisB O33 whisker, the examined strength (30 MPa)
was about five times stronger than commonly used sand cores. On the other hand, there were
surface folds on all specimens. In addition, internal shrinkage occurred in all specimens. The
amount of shrinkage decreased with increasing ceramic content. However, excess ceramic content
was found to cause high apparent viscosity, resulting in extremely low formability.
Keywords: salt, core, potassium chloride, ceramic, whisker, castability,bending strength, surface fold,
Taku Ohide, Tetsuo Mikami, Takashige Kimura, et al. Effects of Combination of Treatment Alloys Placed in Reaction Chamber on Transitional Graphite Structure by Inmold Process. Journal of Japan Foundry Engineering Society. 1996, Vol.68, No.11, p.1011.