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<p>In this study, feedstocks were prepared with gas atomized SS316L powder- and water-based agar binder system along with other additives in order to mitigate the effects of wax- or polymer-based binders that are normally used in metal injection molding. Several tests were performed by varying the solid loadings from 45 to 65 vol. % to evaluate the homogeneity of feedstock. The value of critical powder loading was measured to be 64.5 vol. % and a solid loading of 60 vol. % was used. The feedstocks were injection molded at 85-90&#xa0;°C under 150&#xa0;MPa pressure. The green density, density distribution and strength of the compacts after molding were measured. The specimens were air dried and debinded at 500&#xa0;°C. Subsequently, the brown samples were sintered at a temperature of 1350&#xa0;°C for 0.5, 1.0, 1.5 and 2&#xa0;h. under hydrogen atmosphere and the variations in sintered density with holding time was measured. Microscopic techniques were used to establish the degree of densification as well as the concomitant microstructural changes. It was found that the density of sintered SS316L samples increased with sintering time. Sintered density up to 95.6% of the theoretical value was obtained. The mechanical property of hardness was measured and compared with the reported values.</p>

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Microstructure and Mechanical Properties of SS316L Fabricated via MIM Using Agar Binder System

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • D. Sivaprahasam,
  • S. Sudakara Sarma,
  • K. Murugan,
  • S. B. Chandrasekhar

摘要

In this study, feedstocks were prepared with gas atomized SS316L powder- and water-based agar binder system along with other additives in order to mitigate the effects of wax- or polymer-based binders that are normally used in metal injection molding. Several tests were performed by varying the solid loadings from 45 to 65 vol. % to evaluate the homogeneity of feedstock. The value of critical powder loading was measured to be 64.5 vol. % and a solid loading of 60 vol. % was used. The feedstocks were injection molded at 85-90 °C under 150 MPa pressure. The green density, density distribution and strength of the compacts after molding were measured. The specimens were air dried and debinded at 500 °C. Subsequently, the brown samples were sintered at a temperature of 1350 °C for 0.5, 1.0, 1.5 and 2 h. under hydrogen atmosphere and the variations in sintered density with holding time was measured. Microscopic techniques were used to establish the degree of densification as well as the concomitant microstructural changes. It was found that the density of sintered SS316L samples increased with sintering time. Sintered density up to 95.6% of the theoretical value was obtained. The mechanical property of hardness was measured and compared with the reported values.