Moldability of metal injection molding (MIM) is dependent on the outward appearance of the resultant feedstock. Properties of the binders used will influence the properties of the feedstock. Stainless steel powder 316L with mean size 22 μm and the binder system consists of three major fractions of paraffin wax, thermoplastic natural rubber and stearic acid with a powder loading of 65 vol. % was investigated. Comparison was also made with existing palm stearin in the binder system replacing the paraffin wax. Kinetic solvent extractions were done to determine the differences between the binder systems. The feedstock was then injected into tensile bar using vertical injection machine. The results showed that there is a slightly time extension during the solvent extraction as a comparison. The feedstock has been successfully injection molded at 190-200°C. Study of thermal analysis such as DSC and TGA has been done as a preparation for the thermal debinding and sintering process. This study demonstrated that a backbone polymer; thermoplastic natural rubber performs best in term of flow stability and compact quality and also saves in processing time.
Membrane technologies have received high interest in the separation gas mixture. The
ceramic inorganic membranes have possessed high permeability, excellent thermal,
chemical and mechanical stabilities compared to conventional polymer membranes.
This work presents the fabrication of silica ceramic membrane by sol dip-coating
method. The tubular support was dipped into the solution of tetrethylorthosilicate
(TEOS), distilled water and ethanol with the addition of nitric acid as a catalyst. The
fabricated silica membrane was then characterized by (Field Emission Scanning
Electron Microscope) FESEM and (Fourier transform infrared spectroscopy) FTIR to
determine structural and chemical properties at different dipping number. FESEM
images indicate that the silica has been deposited on the surface fabricated ceramic
membrane and penetrate into the pore walls. However, number of dipping did not
affect the intensity peak of FTIR analysis.