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열간금형 공구강의 내구성 향상을 위한 복합열처리기술에 관한 연구
송점식,김순호,김영희 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.-
This study has been conducted to develop the combined heat treating technique of gas carburising-gas nitriding and gas carburising to improve the hot working performance of type H3 hot work tool steel. Case depth and carbides coarsening were increased with increasing carburising temperature and time, respectively. Surface hardness showed decreasing tendency with increasing 2nd temperature after carburising treatment. After carburising, 2nd tempering at 500℃ to 600℃ was chosen according to a hardness demand of final product. High temperature temperature tempering resistance showed more excellent quality during such carburising-nitriding of carburising than complex treatment as after conventional hardening.
이온 질화 처리에 의한 Ti-6Al-4V의 표면특성 개선
宋点植,金信起,全允祚,金慶勳,文武聖 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3
This paper presents the results from the studies on the surface layers produced by ion nitriding at three different temperatures in order to improve wear resistance, hardness, and to modulate microstructure and chemical composition of surface layers. X-ray diffraction indicated the formation of two phases(TiN, Ti_2N) and the preferred orientations of TiN occured when nitrided at 810℃. Ion nitrided surface had the Vickers hardness of 860 Hv and greatly improved the wear resistance of Ti-6A1-4V. The cytotoxicity was measured with NIH 3T3 fibroblast by SRB method and was compared with that of the FDA approved Ti-6A1-4V. Corrosion resistance and cytotoxicity was similar to untreated Ti-6A1-4V alloy.
화학기상증착법의 Parylene 코팅에 의한 천연 라텍스 표면개질
송점식 ( Jeom Sik Song ),최서윤 ( Seo Yoon Choi ),정성희 ( Seong Hee Jung ),차국찬 ( Gook Chan Cha ),이석민 ( Suk Min Lee ),문무성 ( Mu Seong Mun ) 한국고무학회 2004 엘라스토머 및 콤포지트 Vol.39 No.4
라텍스 고무의 기계적 성질과 생체적합성 등의 표면특성을 개선하기 위하여 3가지 종류의 패럴린(PA-N, PA-C 및 PA-D)을 라텍스 고무 표면에 증착하였다. 패럴린 증착은 화학기상증착법(chemical vaper deposition)법을 이용하였으며, 증착필름의 표면특성을 조사하였다. 증착 후 열처리에 의한 증착 필름의 기계적 성질 변화를 조사하였다. 패럴린 증착 필름과 라텍스고무와의 접착력은 PA-C와 PA-D 모두 우수하였다. 열처리 온도가 증가함에 따라 PA-N의 경우는 접촉각이 커져 보다 소수성 쪽으로 변화는 경향을 보였으며, PA-C와 PA-D는 친수성에 가까운 쪽으로 변화하였다. 열처리 온도가 증가할수록 인장강도는 증가하고 연신율은 감소하였다. CVD법으로 증착된 패럴린 박막은 우수한 생체적합성을 나타내었다. Three types of parylene (PA-N, PA-C, PA-D) were used for coating the surface on natural latex rubbers in order to improve surface characteristics including mechanical properties and biocompatibility. The parylene coating was the CVD (chemical vapor deposition) method, and the surface properties of the modified latex were measured. Annealing effects on the mechanical properties of the coated latex were also investigated. The adhesion between latex and parylene was good for all the types of parylene used. As annealing temperature was increased, latex modified with PA-N became more hydrophobic, while the latex treated with PA-C and PA-D became more hydrophilic. As the annealing temperature was raised, the tensile strength was increased, and the elongation was decreased. The biocompatibility was noticeably improved on the latex surface modified with the parylenes through CVD method.