[논문]Application of dual coating process and 3D printing technology in sand mold fabrication

Choi, Hyun-Hee; Kim, Eun-Hee; Park, Hye-Yeong; Cho, Geun-Ho; Jung, Yeon-Gil; Zhang, Jing

doi:10.1016/j.surfcoat.2017.07.035

Application of dual coating process and 3D printing technology in sand mold fabrication

Surface & coatings technology, v.332, 2017년, pp.522 - 526

Choi, Hyun-Hee (School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea) , Kim, Eun-Hee (School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea) , Park, Hye-Yeong (School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea) , Cho, Geun-Ho (School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea) , Jung, Yeon-Gil (School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea) , Zhang, Jing (Department of Mechanical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA)

Abstract ▼ AI-Helper

A new dual coating process has been developed for complex sand mold casting using three-dimensional (3D) printing technique. In the dual coating process, two types of polyvinyl alcohols (PVAs) with different decomposition points were applied, unlike conventional casting methods that use just one organic binder. Mullite bead (similar to 200 mu m), mullite powder (similar to 16 mu m), and zircon flour (similar to 43 mu m) were used as starting materials, which were coated with PVA aqueous solution and then recoated with an inorganic binder. The coated powders were heat-treated at 1000 degrees C for 1 h, followed by a 3D printing process. The sample was heat-treated at 250 degrees C for 4 h to burn out the PVA with a lower decomposition point. The heat-treated sample was dipped into the solution of the inorganic binder composed of tetraethyl orthosilicate and sodium methoxide, which are the silica and sodium oxide precursors, respectively. After drying at 80 degrees C for 1 h, the final heat treatment was conducted at 1000 degrees C for I h to produce an organic-inorganic conversion reaction. In the case of the starting materials composed with the same composition, as the particle size became smaller, higher surface roughness and strength were obtained. The highest green and firing strength could be obtained in the samples with zircon flour and mullite bead, respectively. These results confirm the feasibility of combining a new coating process with 3D printing technology. (C) 2017 Elsevier B.V. All rights reserved.

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참고문헌 (19)

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Application of dual coating process and 3D printing technology in sand mold fabrication

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Application of dual coating process and 3D printing technology in sand mold fabrication

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