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, cilt.27, sa.2, ss.333-341, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 2
  • Basım Tarihi: 2012
  • Dergi Adı: JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.333-341
  • Anahtar Kelimeler: Steatite, Powder Injection Molding, Rheologhy, MOLDED COMPACTS, BINDER REMOVAL, POWDER
  • Gazi Üniversitesi Adresli: Evet

Özet

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.