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Fe-3.0Ni-0.7Cr-1.4Mn-X강의 고주기피로특성에 미치는 질화/DLC코팅의 영향
장재철(Jae Cheol Jang),김송희(Song-Hee Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.6
Various surface treatments and thin film coating processes on the surface of injection die steel have been developed to extend the life. Most of previous studies were mainly focused on investigating the wear and static bonding behavior of thin films. In this study complex surface treatments of DLC coating combined with ion nitriding were applied to increase fatigue life and wear resistance. Ion nitriding, DLC coating, and DLC coating following nitriding on the surface of Fe-3.0Ni-0.7Cr-1.4Mn-X steel were investigated to uncover the beneficial effect which is applicable to injection die. The effect of various surface treatments and coating conditions on high cycle fatigue resistance was studied. Surface morphology change during fatigue tests were observed with AFM. Fatigue life of the die steel increased by 10 to 1,000 times at the various level of stress amplitudes in the condition of DLC coating following the ion nitriding for 3 hrs comparing with the only DLC coated condition.
열전소자의 냉온기능을 이용한 제어패널용 제습기 설계 및 구현
장재철(Jae Chul Jang) 산업기술교육훈련학회 2015 산업기술연구논문지 (JITR) Vol.20 No.4
This paper, is to prevent failure due to moisture in the industrial control panels. Dehumidifier is operate when measuring the internal temperature of the panel, temperature is higher(during operation) thermal module cooling(cooling dehumidification) to dehumidify and low(shutdown) a thermoelectric module heat(dehumidifying heat) to remove moisture. Dehumidifier is implemented using thermoelectric module to controller a proportional of the temperature and humidity. Inside sensor is measuring temperature and humidity in order to protect the PCB circuit. Thermoelectric module according to the model size and the property is also a very important design element to the heat sink structure to maintain a proper heat resistance and vary according to the type of Module. By implementing the dehumidifier for control panel functions of the thermoelectric elements using a cold was confirmed that no noise, vibration-free, can be an effective dehumidifier by a low energy consumption of the local space.