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STEATİTİN ENJEKSİYONLA KALIPLANABİLİRLİĞİNE BESLEME STOK REOLOJİLERİNİN ETKİSİNİN ARAŞTIRILMASI

INVESTIGATION OF EFFECT OF FEEDSTOCK RHEOLOGIES FOR INJECTION MOLDING OF STEATITE

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
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 x10-3Pa-1s-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 cm3), cylinder temperature (185- 200 0C) 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 0C/min and 10C/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.
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Abstract (Original Language): 
Bu çalışmada; steatitin enjeksiyonla hatasız kalıplanması için en uygun reoloji, bağlayıcı giderme ve kalıplama parametreleri belirlenmiştir. Kılcal ve tork reometre çalışması ile dört farklı besleme stoğu için erime akış indeksi (554 - 988 g/10 dakika), akış davranış indeksi (0,507 - 0,601), akıcılık (5,21 - 8,99 x10-3Pa-1s-1) ve aktivasyon enerjisi (26,9 - 39,1 kJ/mol) değerleri belirlenerek en ideal besleme stoğu tespit edilmiştir. Reolojik açıdan en ideal besleme stoğu Steatit + polietilenglikol (PEG) + polipropilen (PP) + stearik asit (SA)’den oluşan karışımdır. Bu besleme stoku için farklı akış hızı (15-25 cm3), silindir sıcaklığı (185-200 0C) ve enjeksiyon basıncı (1000-1350 bar) değerleri için kalıplama yapılmıştır. Kalıplanmış numunelere bağlayıcı giderme işlemi çözgen ve ısıl olmak üzere iki şekilde gerçekleştirilmiştir. Isıl bağlayıcı giderme 100C/dakika ve 10C/dakika ısıtma hızında gerçekleştirilmiştir. Sonrasında optimum reoloji, bağlayıcı giderme ve kalıplama parametreleri ile üretilmiş numunelere SEM incelemesi yapılmıştır. Çarpılma, iç çatlak ve deformasyona rastlanmayan final parçaları elde edilmiştir.
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