Vacuum venting is a method proposed to improve feature replication in microparts that are fabricated using micro-injection molding (MIM). A qualitative and quantitative study has been carried out to investigate the effect of vacuum venting on the nano/microfeature replication in MIM. Anodized aluminum oxide (AAO) containing nanofeatures and a bulk metallic glass (BMG) tool mold containing microfeatures were used as mold inserts. The effect of vacuum pressure at constant vacuum time, and of vacuum time at constant vacuum pressure on the replication of these features is investigated. It is found that vacuum venting qualitatively enhances the nanoscale feature definition as well as increases the area of feature replication. In the quantitative study, higher aspect ratio (AR) features can be replicated more effectively using vacuum venting. Increasing both vacuum pressure and vacuum time are found to improve the depth of replication, with the vacuum pressure having more influence. Feature orientation and final sample shape could affect the absolute depth of replication of a particular feature within the sample.
Vacuum Venting Enhances the Replication of Nano/Microfeatures in Micro-Injection Molding Process
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received July 22, 2015; final manuscript received February 25, 2016; published online March 24, 2016. Assoc. Editor: Martin Jun.
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Ying Choi, S., Zhang, N., Toner, J. P., Dunne, G., and Gilchrist, M. D. (March 24, 2016). "Vacuum Venting Enhances the Replication of Nano/Microfeatures in Micro-Injection Molding Process." ASME. J. Micro Nano-Manuf. June 2016; 4(2): 021005. https://doi.org/10.1115/1.4032891
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