SM45C재의 PVD코팅과 필름에 의한 트라이볼러지 특성

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 32; no. 6; pp. 502 - 510
• Main Authors: 심현보(Hyun-Bo Shim), 서창민(Chang-Min Suh), 김종형(Jong-Hyoung Kim), 서민수(Min-Soo Suh)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2018
• Subjects: 해양공학; Tibology 트라이볼러지; Physical vapor deposition PVD 물리증착; Thin film 얇은 필름; Press die 프레스 금형; SM45C; CrN 크롬질화코팅; Concept multi-coating 개념 다층코팅; Surface hardness 표면경도
• ISSN: 1225-0767; 2287-6715
• DOI: 10.26748/KSOE.2018.32.6.502

In order to accumulate data to lower the friction coefficient of a press mold, tribological tests were performed before and after coating SM45C with a PVC/PO film and plasma coating (CrN, concept). The ultrasonic nanocrystal surface modification (UNSM)-treated material had a nano-size surface texture, high surface hardness, and large and deep compressive residual stress formation. Even when the load was doubled, the small amount of abrasion, small weight of the abrasion, and width and depth of the abrasion did not increase as much as those of untreated materials. A comparison of the weight change before and after the tribological test with the CrN and the concept coating material and that of the untreated material showed that the wear loss of the concept coating material and P-UNSM treated material (that is, the UNSM treated material treated with the concept coating) showed a tendency to decrease by approximately 55-75%. Concept 100N had a lower friction coefficient of about 0.6, and P-UNSM-30-100N showed almost the same curve as concept 100N and had a low coefficient of friction of about 0.6. The concept multilayer coating had a thickness of $5.32{\mu}m$. In the beginning, the coefficient of friction decreased because of the plasma coating, but it started to increase from about 250-300 s. After about 350 s, the coefficient of friction tended to approach the friction coefficient of the SM45C base metal. The SGV-280F film-attached test specimen was slightly pushed back and forth, but the SM45C base material was not exposed due to abrasion. The friction coefficient was 0.22, which was the lowest, and the tribological property was the best in this study.