Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 28, No. 10 (October 2015) 1493-1499   

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  EFFECTS OF MICRO AND NANO SIZED SIC POWDER ON THE RHEOLOGICAL PROPERTIES OF AL BASED FEEDSTOCKS FOR LOW PRESSURE INJECTION MOLDING
 
A. Ghanbari, M. Alizadeh, R. Yazdani Rad and E. Ghasemi
 
( Received: May 03, 2014 – Accepted: September 03, 2015 )
 
 

Abstract    This study investigates the effects of micro- and nano-sized SiC powder on the rheological behavior of Al based feedstocks for powder injection molding (PIM). Different compositions of Al feedstocks with additions of micro and nano-SiC powder were prepared and their rheological properties were measured with a rotational rheometer. The effects of SiC content and shear rate were investigated and activation energies were compared amongst the feedstocks. The results showed that nano-SiC powder has a prominent effect on the viscosity and yield stress whereas micro-SiC does not have an effective role and the base micro-Al powder determines the overall rheological behavior of the feedstock. It was found that the feedstocks reveal pseudoplastic behavior at low shear rates and dilatancy at high shear rates. The critical shear rate (γcrit) was 100 s-1 for changing the rheological behavior. The activation energy of a given feedstock was found to increase with micro-SiC content while the reverse trend was observed for nano-SiC.

 

Keywords    Injection molding, Al-SiC, SiC nanoparticles,Rheology

 

چکیده    هدف از این تحقیق، بررسی تاثیر پودر سیلیکون کارباید (درابعادمیکروونانو) بر رفتار رئولوژی خمیرهای کامپوزیت زمینه آلومینیومی (خمیرهای مورد استفاده در فرایند قالبگیری تزریقی) می­باشد. از این رو ترکیبات متفاوتی از خمیرهای آلومینیوم با افزودن پودر سیلیکون کارباید میکرومتری و نانومتری تهیه شدند و رفتار رئولوژی آنها توسط دستگاه رئومتر چرخشی مورد بررسی قرار گرفت. مقدار سیلیکون کارباید، نرخ برشی و انرژی های فعالسازی خمیرها پارامترهای در نظر گرفته شده در این مطالعه می باشند. نتایج نشان داد که پودر سیلیکون کارباید نانومتری تاثیر حایز اهمیتی بر ویسکوزیته و تنش تسلیم دارد در حالی که سیلیکون کارباید میکرومتری نقش مهمی نداشته و پودر آلومینیوم میکرومتری تعیین کننده رفتار رئولوژی خمیرهای حاوی سیلیکون کارباید میکرومتری است. همچنین خمیرها دارای رفتار شبه پلاستیک در نرخ برشی های پایین و رفتار دیلاتانت در نرخ برشی های بالا هستند. نرخ برشی بحرانی (γcrit) ( نرخ برشی که در آن رفتار رئولوژی تغییر می کند) برابر با 100 دور بر ثانیه است. انرژی فعالسازی خمیرهای حاوی سیلیکون کارباید میکرومتری با افزایش مقدار سیلیکون کارباید افزایش یافت در حالی که در خمیرهای حاوی سیلیکون کارباید نانومتری رفتار عکس مشاهده شد.

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