INVESTIGATION OF EFFECT OF FEEDSTOCK RHEOLOGIES FOR INJECTION MOLDING OF STEATITE


URTEKİN L., USLAN İ. , Tuc B.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.27, no.2, pp.333-341, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 2
  • Publication Date: 2012
  • Title of Journal : JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Page Numbers: pp.333-341
  • Keywords: Steatite, Powder Injection Molding, Rheologhy, MOLDED COMPACTS, BINDER REMOVAL, POWDER

Abstract

In this study, the net-shape injection molding of steatite for the most appropriate rheology, debinding and molding parameters were determined. The investigations of the rheology as four different feedstock of melt flow index (554 - 988 g/10 min), flow behavior index (0.507 - 0.601), fluency (5.21 - 8.99 x10(-3)Pa(-1)s(-1)) and activation energy values (26,9 - 39,1 kJ/mol) were ideally determined using by capillary and torque rheometer machine. The steatite + polyethyleneglycol (PEG) + polypropylene (PP) + stearik asit (SA) have most ideally mixture for rheology. This feedstock for molding was occured at different flow rate (15-25 cm(3)), cylinder temperature (185-200 degrees C) and injection pressure (1000-1350 bar) values. The debinding processes carrided out at two steps as solvent and thermal debinding. The thermal debinding carried 10 degrees 0C/min and 1 degrees C/min for heating rate. The samples were investigated to determine of distortion, cracks and deformation in the inner parts with SEM machine. The net-shaped samples were obtained at optimum rheology, debinding and molding parameters.