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생체용 Ti합금의 산화거동에 미치는 Ta 및 Nb 첨가의 영향
이도재,오태욱,박범수,김수학,전충극,윤계림,Lee Doh-Jae,Oh Tae-Wook,Park Bum-Su,Kim Soo-Hak,Jun Choong-Geug,Yoon Kye-Lim 한국재료학회 2004 한국재료학회지 Vol.14 No.3
The oxidation behaviors of Ti-10Ta-10Nb alloy and Ti-6Al-4V alloy were studied in dry air atmosphere. Specimens were melted in consumable vacuum arc furnace and homogenized at $1050^{\circ}C$ for 24 h. Hot rolling was performed at $1000^{\circ}C$. Specimens of the alloys were oxidized as the temperature range $400~650^{\circ}C$ for 30 min. The oxidation behavior of the alloys was analysed by optical microscope, SEM/EDX, XRD, XPS and TGA. Immersion test was performed in 1% Lactic acid. In the microscope observation, oxide layer of Ti-10Ta-10Nb alloy was denser and thinner than Ti-6Al-4V's. The weight gains during the oxidation rapidly increased at the temperature above $600^{\circ}C$ in Ti-6Al-4V's alloy and$ 700^{\circ}C$ in Ti-10Ta-10Nb alloy. According to XRD results, oxide layers were composed of mostly $TiO_2$(rutile) phase. It was analysed that the passive film of the Ti alloys consisted of $TiO_2$ through X-ray photoelectron spectroscopy(XPS) analysis.
표면 개질에 따른 Ti-8wt.%Ta-3wt.%Nb 합금의 생체적합성
이도재,이경구,박범수,이광민,박상원,Lee, Doh-Jae,Lee, Kyung-Ku,Park, Bum-Su,Lee, Kwang-Min,Park, Sang-Won 한국재료학회 2006 한국재료학회지 Vol.16 No.5
The alloys were prepared by a non-consumable vacuum arc melting and homogenized at $1050^{\circ}C$ for 24 hrs. Two kind of surface modifications were performed alkali treatment in 5.0M NaOH solution subsequent and heat treatment in vacuum furnace at $600^{\circ}C$, and were oxidizing treatment at the temperature range of 550 to $750^{\circ}C$ for 30 minutes. After surface modification, these samples were soaked in SBF which consists of nearly the same ion concentration as human blood plasma. Cytotoxicity tests were performed in MTT assay treated L929 fibroblast cell culture, using indirect methods. A porous and thin activated layer was formed on Titanium and Ti-8Ta-3Nb alloy by the alkali treatment. A bone-like hydroxyapatite was nucleated on the activated porous surfaces during the in vitro test. However, Ti-8Ta-3Nb alloys showed better bioactive properties than Titanium. According to XRD results, oxide layers composed of mostly $TiO_2$(rutile) phases. Cytotoxicity test also revealed that moderate oxidation treatment lowers cell toxicity and Ti-8Ta-3Nb alloy showed better results compared with Titanium.
이도재(Doh-Jae Lee),이광민(Kwang-Min Lee),이경구(Kyung-Ku Lee),박범수(Bum-Su Park),김수학(Soo-Hak Kim),전충극(Choong-Geug Jun),윤계림(Kye-Lim Yoon) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.1
The oxidation behavior of Ti-Nb alloys was studied in dry atmosphere. After vacuum arc melting and hot rolling treatment, Ti-Nb alloys were oxidized at 450℃~750℃. The oxidation behaviors between matrix and oxide scale were analyzed by SEM, XPS and XRD. Ti-Nb alloys had higher oxidation resistance than pure Ti at 750℃. XPS analysis of oxide film revealed that TiO₂ oxide was formed on the top of surface. The weight gains during the oxidation increase rapidly at temperature above 600℃ which obey the parabolic law.
Ha-Young Kim(김하영),Jae-Won Byun(변재원),Albert Byungyun Jeon(전병윤),Bum Soo Park(박범수),Ji-A Jung(정지아),Mihak Park(박미학),Yeon-Su Lim(임연수),Byeong Yeal Jung(정병열) 한국생명과학회 2012 생명과학회지 Vol.22 No.6
요네병은 Mycobacterium avium subspecies paratuberculosis에 의해 발생하며 반추동물에서 만성 쇠약을 일으켜 전세계적으로 양축산업에 커다란 경제적 손실을 일으키는 질병이다. 본 연구에서는 2008년부터 2009년까지 2년동안 의뢰된 총 3,927건의 국가 종축우의 혈청에 대한 요네병의 항체 양성률에 대해 조사한 결과 21두(0.5%)에서 항체 양성을 나타내었으며 이는 국내 일반 농가의 양성률(1.2-16.4%) 보다 현저히 낮은 수준이었다. 또한 연령별 양성률은 2세 미만에서 0.2% (3두), 2-3세에서 0.4% (2두), 3-4세에서 0.7% (3두), 4세 초과에서 0.9% (13두)로 전연령에서 양성이 나타났으나 연령이 높아짐에 따라 양성률이 증가하는 경향을 보였다. 품종 별로는 젖소는 모두 음성이었으며 한우에서만 양성률 0.6%를 나타내었다. Paratuberculosis (Johne’s disease), a chronic wasting disease caused by Mycobacterium avium subspecies paratuberculosis (MAP), is a major cause of economic loss in the cattle industry. In Korea, national monitoring of breeding stock for MAP has been implemented. In this study, we report the results of serological testing to determine the prevalence of MAP in breeding stock of Korean native and dairy cattle during 2008 and 2009. A total of 3,927 serum samples were submitted (3,692 Korean native cattle and 235 dairy cattle) to Animal Disease Diagnostic Division, Animal, Plant and Fisheries Quarantine and Inspection Agency. The samples were classified into four different age groups for MAP; group 1 (≤2 year, n = 1,509), group 2 (>2 years to≤3 years, n = 486), group 3 (>3 years to ≤4 years, n = 441), and group 4 (>4 years, n = 1,491). Overall seroprevalence of MAP in this study was 0.5% (21/3,927), which was much lower than that of conventional cattle (1.2-16.4%) in Korea. Also, the seroprevalence was determined by age groups: three of group 1 (0.2%), two of group 2 (0.4%), three of group 3 (0.7%), and 13 of group 4 (0.9%) were seropositive for MAP, respectively. Although seropositive samples were found in all age groups, the seroprevalence tended to increase with age. Our study showed that the seroprevalence of MAP in pure-bred breeding dairy cattle (0%) was lower than that in pure-bred breeding Korean native cattle (0.6%).
Ti-8wt.%Ta-3wt.%Nb합금의 산화특성 및 생체안정성
이도재(Doh-Jae Lee),이경구(Kyung-Ku Lee),박범수(Bum-Su Park),이광민(Kwang-Min Lee),박상원(Sang-Won Park) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.1
The oxidation behavior and Biocompatibility of pure Ti and Ti-8Ta-3Nb alloy were studied in dry air atmosphere. The specimens showed that Ti-8Ta-3Nb alloy had higher oxidation resistance than pure Ti at 650. Cytotoxicity test also revealed that moderate oxidation treatment lower cell toxicity and Ti-8Ta-3Nb alloy showed better results compared with pure Ti. The weight gains during the oxidation increase rapidly at temperature above 600℃.