Title of article :
RHEOLOGICAL BEHAVIOR OF SS316L GAS ATOMIZED POWDER IN BIMODAL PARTICLE SIZE DISTRIBUTION IN A COMPOSITE BINDER SYSTEM
Author/Authors :
Jamaludin, K. R. Universiti Teknologi Malaysia - College of Science and Technology - Department of Mechanical Engineering, Malaysia , Muhamad, N. Universiti Kebangsaan Malaysia - Fakulti Kejuruteraan dan Alam Bina, Malaysia , Amin, S. Y. M. Universiti Tun Hussein Onn Malaysia - Department of Mechanical and Manufacturing, Malaysia , Rahman, M. N. Ab. Lhokseumawe State Polytechnic - Department of Mechanical Engineering, Indonesia , Murtadhahadid Lhokseumawe State Polytechnic - Department of Mechanical Engineering, Indonesia
Abstract :
Rheological properties of the monomodal and bimodal MIM feedstock are presented in this paper. Coarse and fine SS316L gas atomized powders are mixed with PEG and PMMA to form a homogenous paste, which is termed as feedstock. The surface active agent used here is stearic acid. The bimodal powders are blended from 30 to 70 % of the coarse powder distribution. Results show that monomodal feedstock exhibits a higher viscosity over the bimodal feedstock at low shear rate. Binder separation is also likely to occur in the monomodal feedstock prepared with coarse powder especially at a high injection temperature. Furthermore, bimodal feedstock is less viscous than the monomodal feedstock but the particle size distribution has shown its influence on viscosity. The flow behavior index decreases when the temperature increases. The investigation also shows that the feedstock flow sensitivity depends on the fine powder distributions in the feedstock. Since all the feedstock demonstrates a good pseudo plastic behavior, it therefore is suitable to be injection molded
Keywords :
Particle size distribution , Rheology , MIM feedstock , flow sensitivity , bimodal
Journal title :
International Journal of Mechanical and Materials Engineering
Journal title :
International Journal of Mechanical and Materials Engineering
