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플라즈마 침탄 및 CrN 코팅된 Ti-6Al-4V 합금의 기계적특성
박용권,위명용 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.2
In order to improve the low hardness and low wear resistance of Ti-6Al-4V alloy, plasma carburization treatment and CrN film coating was carried out. Effects of the plasma carburization and CrN coating were analyzed and compared with the non-treated alloy by microstructural observation, structure characterization and mechanical property test. The plasma carburization treated alloy formed a carburized layer of about 150㎛ in depth from the surface, where a fine and hard particles of TiC and V_4C_3 were homogeneously dispersed through the layer. CrN thin film thickness was about 7.5㎛ and grew with (111) orientation. Hardness value of about Hv 402 in the matrix was improved as Hv 1600, 1390 by plasma carburization, CrN thin film, respectively. Roughness test is an important method to evaluate the surface treatment effect on the wear resistance. The optimum surface roughness of about 0.063 ㎛ could be obtained by CrN film coated, while, about 0.321 ㎛ and 0.211 ㎛ in the matrix and plasma carburization specimens, respectively.
복합처리 (Carburized/CrN Coating)로 표면개질된 Ti-6Al-4V 합금의 구조 및 기계적 성질
박용권,위명용 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3
In order to improve the low hardness and low wear resistance of Ti-6Al-4V alloy, plasma carburization and CrN coating were carried out. After composite surface treatment, the carburized layer was about 150 ㎛ in depth and CrN coated layer was about 7.5 ㎛ in thickness, respectively. Based on XRD diffraction patterns, preferential growth along (111) direction was observed. The hardness(Hv) was significantly improved up to about 1,960 after plasma carburized/CrN coating while the hardness value of original alloy was 402 before treatment. This result might be associated with TiC carburized layer and CrN coating formation on the surface of Ti-6Al-4V alloy and such high value of hardness dramatically improve the wear resistance. Through the adhesion test of coating, critical load was as high as 32N as compared with the simply processed CrN coating of a 18N.
플라즈마 침탄과 CrN 코팅된 Ti-6Al-4V 합금의 미세구조 및 기계적 특성
박용권,위명용 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.12
In order to improve the low hardness and low wear resistance of Ti-6Al-4V alloy, plasma carburization treatment and CrN film coating was carried out. Effects of the plasma carburization and CrN coating were analyzed and compared with the non-treated alloy by microstructural observation, structural characterization and mechanical property test. The plasma carburization treated alloy formed a carburized layer of about 150 mm in depth from the surface, where a fine and hard particles of TiC and V₄C₃ were evenly homogeneously dispersed through the layer. CrN thin film thickness was about 7.5 mm and grew with (111) orientation. Hardness value of about Hv 402 in the matrix was improved as Hv 1,600, 1,390 by plasma carburization, CrN thin film, respectively. Roughness test is an important method to evaluate the surface treatment effect on the wear resistance. The optimum surface roughness of about 0.063 mm could be obtained by CrN film coated, while, about 0.321 mm and 0.211 ㎛ in the matrix and plasma carburization specimens, respectively.
복합처리 (Carburized/CrN Coating)로 표면개질된 Ti-6Al-4V 합금의 구조 및 피로특성
위명용,박용권 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.12
In order to improve the surface hardness and fatigue of Ti-6A1-4V alloy, plasma carburization and CrN coating were carried out. After composite surface treatment, the depth of carburized layer was about 150 μm and the thickness of CrN coated layer was about 7.5 pm, respectively. Surface hardness and roughness was significantly improved up to about H_(v)1,960 and 0.045 pm after plasma carburized/CrN coating in comparison with the value hardness and roughness, H_(v), 402 and 0.321 μm of the alloy before surface modification. This result might be associated with the formation of TiC carburized layer and CrN coating on the surface of Ti-6A1-4V alloy. During the scratch test of coating, critical load was as high as 32N as compared with the simply processed CrN coating of a 18N. Such changes of hardness and roughness could be contributed to improving the fatigue life. (Received July 14, 2004)
Ti-6Al-4V 합금의 미세조직 및 크리프 특성에 미치는 플라즈마 침탄 처리의 영향
박용권 ( Park Yong Gwon ),위명용 ( Wi Myeong Yong ),박정웅 ( Park Jeong Ung ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.2
N/A In order to improve the wear resistance of Ti-6AI-4V alloy, plasma carburization treatment was newly carried out without consumption of its good specific strength and fatigue life over the temperature. Effect of the plasma carburization was analyzed and compared with the non-treated alloy by microstructural observation, structure characterization and mechanical test. The plasma treated alloy formed a carburized layer of about 150 ㎛ in depth from the surface, where a fine and hard particles of TiC and V₄C₃ were homogeneously dispersed through the layer. The steady-static creep behaviors of Ti-6AI-4V alloy, using the constant stress creep tester, were investigated over the temperature range of 510∼550 ℃(0.42-0.44Tm) and the stress range of 200-275 MPa. Stress exponent(n) was decreased from 9.32 of non-treatment specimen to 8.95 of carburized, however, the activation energy(Q) increased from 238 to 250 kJ/㏖ with the same condition as indicated above. From the above results, it can be concluded that the static creep deformation for Ti-6AI-4V alloy was controlled by the dislocation climb over the ranges of the experimental conditions.
박용권(Yong Gwon Park),최재하(Jae Ha Choi) 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.3
N/A TiO₂thin film has wide application because of its high capacitance, reflection, and good transimissivity in visible range. TiO₂thin film can be made by thermal deposition method, reactive evaporation method, activated reactive evaporation(ARE) method. In the case of thermal deposition, the oxygen deficiency can occur because the melting point of Ti is very high. While in the case of reactive evaporation, high density TiO₂can not be made, because reactive gas(O₂) and evaporated material(Ti) are not fully combined, activated reactive evaporation, TiO₂is easily deposited at lower gas pressure compared with reactive evaporation because the ionized reactive gas is made by plasma. Therefore, activated reactive evaporation is very useful to deposit the material having the high melting point. In this work, we formed TiO₂thin film by activated reactive evaporation method. The surface of TiO₂thin film was analyzed by X-ray photoelectron spectroscopy. The surface morphology which was analyzed by atomic force microscopy(AFM) shows that feature of the film surface is uniform. The dielectric capacitance, withstanding voltage were 600㎌/㎠, 0.4V respectively. In further work, we can increase the withstanding voltage by improving the deposition parameter of substrates.