Authors: Taik Min Lee, Tae Goo Kang, Jeong Soon Yang, Dong Soo Kim, Jeong Dai Jo, Byung Oh Choi, Kwang Young Kim
Abstract: This paper presents the design, fabrication, and performance test of a gap adjustable
piezoelectrically-actuated DoD(drop-on-demand) molten metal injector for application to the 3D
microstructure manufacturing or printed electronics. In the design process, we propose the gap
adjustable mechanism of the piezoelectrically-actuated inkjet system to control the volume and
velocity of the ejected molten metal droplets. In the experimental process, we fabricate the DoD
metal injector and measure the volumes and velocities of the ejected droplets for molten metal as
well as pure water to compare the ejecting performance for the different viscosity of ink and the
operating temperature of the system.
1391
Authors: Hong Kyu Kwon, Kwang Soo Kim
Abstract: “Getting to market first” is extremely intensive pressure on the companies in this competitive business environment. The speed at which products are developed and released to market is tightly linked to profitability and market share. Hence, many companies are still in a desperate need of real Rapid Tooling (RT) technologies which can really help expedite their prototype tooling and pre -production tooling for injection molding. This paper describes how HT (Hybrid Tooling) process has been being successfully established and effectively applied with Metal filled SLS technologies.
437
Authors: Qiang Zhang, Fu Rong Liu, Ji Min Chen
Abstract: In this paper the research focused on the viability of using the selective laser sintering (SLS) technique for creating tissue engineer (TE) scaffolds. A biocomposite blend comprising polylactic acid (PLA) and hydroxyapatite (HA) was used in the research to study the feasibility of the blend to develop scaffolds. The biocomposite blends obtained via physical blending were subjected to laser sintering to fabricate test specimens. The test specimens were characterized using scanning electron microscopy (SEM) and the components before sintering and after sintering were analyzed by infrared spectrophotometry (IR). The results obtained ascertained that SLS-fabricated scaffolds have good potential for TE applications
1399
Authors: Huey Ling Chang, Chih Ming Chen, Kung Liang Lin, Bor Kae Chang
Abstract: This study investigates the resulting nanocomposite material formed by hot-forming and molding epoxy resin containing diluent, nanosilica powder, and hardener. The effects of different processing conditions on the composite material, such as post-processing, nanopowder content, thinner amount, etc. The optimal processing conditions can be discovered by analyzing samples with a differential scanning calorimeter (DSC) to discern the glass transition temperature (Tg). Experimental results show that without post-processing, the composite material would not have enough reaction time, and that without thinner, the sample containing 1 wt% nanopowder had the highest Tg. The addition of thinner lowers the Tg of a sample, leading to reduced thermal properties.
34
Authors: Huang Jan Hsu, Shyh Yuan Lee, Cho-Pei Jiang
Abstract: The aim of this study is to develop a novel maskless-curing slurry stereolithograhy and sintering process which can fabricate high strength ceramic parts. Three dimension printing of additive manufacturing method was used. High performance stereolithography slurry, which was composed of zirconia powder as structure material and methanol as a solvent and a dispersant, could be prepared with colloidal processing. During layer casting, the diaphanous slurry can penetrate into pores of the subjacent layers. After drying, the binder in the penetrated liquid could connect the fresh layer and subjacent layers. Eventually, a gel-like green block could be built layer by layer. In the exposed region, the resin contained in the green block was cured to connect the zirconia powders to be a part of the rigid green part. The obtained rigid green part was then heated up to 300°C for binder burnout, and then sintered at 1350°C to obtain a high dense zirconia ceramic part. The proposed method of maskless-curing slurry was briefly described and it was proved that the good capacity of solidifying thin layer.
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