Injection moulding of recycled refractory powders from investment casting wastes


Soykan H. S.

INDUSTRIAL CERAMICS, vol.26, no.2, pp.127-131, 2006 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 2
  • Publication Date: 2006
  • Journal Name: INDUSTRIAL CERAMICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.127-131
  • Kocaeli University Affiliated: No

Abstract

Main objective of this study is to recycle shell wastes from the investment casting industry, using powder technology to produce refractory parts. Refractory powders were recovered from bulk wastes using a ball-milling technique and injection-moulded to produce refractory parts. Many thousands of complex-shaped parts were injection-moulded by optimising the process parameters. Recycled powders and the parts were characterized by particle size analysis, scanning electron microscopy, thermogravimetric analysis, density, and size measurements. Performance of the injection-moulded products was tested in sampling operations at molten steel under industrial steelmaking practice. The results allow us to conclude that the shell wastes can be effectively milled and used to produce refractory parts by the injection moulding process. After injection moulding followed by sintering, the final products present a porous microstructure, which has a beneficial effect on their thermal shock resistance.