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High functional surface treatments for rapid heating of plastic injection mold  

Park, Hyun-Jun (Department of Heat & Surface treatment R&D, Korea Institute of Industrial Technology)
Cho, Kyun-Taek (Department of Heat & Surface treatment R&D, Korea Institute of Industrial Technology)
Moon, Kyoung-Il (Department of Heat & Surface treatment R&D, Korea Institute of Industrial Technology)
Kim, Tae-Bum (Department of Heat & Surface treatment R&D, Korea Institute of Industrial Technology)
Kim, Sang-Sub (Department of Materials Science and Engineering, Inha University)
Publication Information
Design & Manufacturing / v.15, no.3, 2021 , pp. 7-12 More about this Journal
Abstract
Plastic injection molds used for rapid heating and cooling must minimize surface damage due to friction and maintain excellent thermal and low electrical conductivity. Accordingly, various surface treatments are being applied. The properties of Al2O3 coating and DLC coating were compared to find the optimal surface treatment method. Al2O3 coating was deposited by thermal spray method. DLC films were deposited by sputtering process in room temperature and high temperature PECVD (Plasma enhanced chemical vapor deposition) process in 723 K temperature. For the evaluation of physical properties, the electrical and thermal conductivity including surface hardness, adhesion and wear resistance were analyzed. The electrical resistance of the all coated samples was showed insulation properties of 24 MΩ/sq or more. Especially, the friction coefficient of high temp. DLC coating was the lowest at 0.134.
Keywords
Injection mold; DLC coating; Wear resistance; Electrical conductivity; Thermal conductivity Coupling;
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