Influences of restaurantwaste fats and oils (RWFO) from grease trap as binder on rheological and solvent extraction behavior in SS316L metal injection molding
This article deals with rheological and solvent extraction behavior of stainless steel 316L feedstocks using RestaurantWaste Fats and Oils (RWFO) from grease traps as binder components along with Polypropylene (PP) copolymer as a backbone binder. Optimal binder formulation and effect of solvent extr...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
MDPI
2016
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8497/ |
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| Summary: | This article deals with rheological and solvent extraction behavior of stainless steel 316L
feedstocks using RestaurantWaste Fats and Oils (RWFO) from grease traps as binder components
along with Polypropylene (PP) copolymer as a backbone binder. Optimal binder formulation and
effect of solvent extraction variables on green compacts are being analyzed. Four binder formulations
based on volumetric ratio/weight fraction between PP and RWFO being mixed with 60% volumetric
powder loading of SS316L powder each as feedstock. The rheological analysis are based on viscosity,
shear rate, temperature, activation energy, flow behavior index, and moldability index. The optimal
feedstock formulation will be injected to form green compact to undergo the solvent extraction
process. Solvent extraction variables are based on solvent temperature which are 40 Celsius, 50 Celsius,
and 60 Celsius with different organic solvents of n-hexane and n-heptane. Analysis of the weight loss
percentage and diffusion coefficient is done on the green compact during the solvent extraction
process. Differential Scanning Calorimeter (DSC) is used to confirm the extraction of the RWFO in
green compacts. It is found that all binder fractions exhibit pseudoplastic behavior or shear thinning
where the viscosity decreases with increasing shear rate. After considering the factors that affect
the rheological characteristic of the binder formulation, feedstock with binder formulation of 20/20
volumetric ratio between PP and RWFO rise as the optimal binder. It is found that the n-hexane
solvent requires less time for extracting the RWFO at the temperature of 60 Celsius as proved by its
diffusion coefficient. |
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