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가토안의 Acid Phosphatase의 활성 및 분포
김태조,손해숙,송미영,이양진 曉星女子大學校 藥學大學 學生會 1990 曉星藥誌 Vol.5 No.-
Lysosomal enzyme activity of choroid, newrosensory retina, iris and ciliarybody, cornea and sclea of the rabbit eye was measured by acid phosphatase(ASPase)as enzyme maker. We reported lysosomal enzyme activity on retinal pigment epitherium in 1998. Distribution of ACPase in the tissues was carried out using Fukuzawa method and Kind-king method. Of the tissues of the rabbit eye the ACPase activity was highest in the choroid(28.6583±12.6920)by Kind-king method. The meurosensory retina(4.5433±2.2091), Iris & ciliary body(2.4138±0.8307), cornea(1.7223±0.6492)and sclea(0.9550±0.0646)also showed the specipic activity of enzyme.
14K 금과 Ti-Ni-Cu 합금의 납재를 이용한 티타늄 납접부의 인장 및 피로강도
배태성,최규형,이민호,김태조 대한치과기재학회 2000 대한치과재료학회지 Vol.27 No.1
티타늄의 납점과정에서 일어나는 산화를 억제하기 위해서는 분위기의 조절이 용이하고, 가열시간이 짧으며, 좁은 범위의 국소적 가열이 가능한 가열장치가 유리하며, 이같은 관점에서 전기저항납점이나 적외선 가열장치를 이용한 납점 및 레이저 빔을 이용한 용접 등이 검토되고 있다. 티타늄 납접부의 기계적 성질을 평가하기 위해 인장시험이 빈번하게 이루어져 왔지만, 주기응력 하에서의 피로현상에 관한 연구는 거의 이루어지지 않았으며, 이에 본 연구에서는 14K 금납과 Ti-Ni-Cu 납으로 티타늄의 납접을 시행한 다음 납접부의 인장강도와 피로특성에 관하여 조사하였다.
추용호,이민호,배태성,김태조 大韓齒科器材學會 1995 대한치과재료학회지 Vol.22 No.2
This study was performed to evaluate the effect of surface roughness on the flow of a 14K gold solder and the tensile strength of solder joints in titanium. To evaluate the flow of 14K gold solder on titanium, the spreading area of solder 10mg at 840℃ was measured on the titanium plate of 15 ×15 ×1mm. Two pieces of titanium rod 30mm in length and 3mm in diameter were butt-soldered using a electric resistance heating and tensile test was subjected to a crosshead speed of 0.5mm/min. Titanium surfaces were polished with #80∼#2000 emery paper and blasted with 50㎛ glass bead or alumina. The solder-matrix interface region was analyzed by EPMA. The results obtained were summarized as follows ; 1. Maximum spreading area was obtained when the surfaces were polished with #240 emery paper, the spreading area decreased with the decrease of surface roughness. 2. Maximum tensile strength value was 398.18 ±15.82 MPa when the soldering surfaces were polished with #2000 emery paper, and tensile strength increased with the decrease of surface roughness. 3. EPMA data for the solder matrix interface region revealed that the diffusion of Au and Cu occured to the titanium matrix, and the reaction zone in the solder showed the increase of Au, Cu, and Ti.
14K 금합금과 Ti-Ni-Cu 합금의 납재를 이용한 티타늄 납접부의 인장 및 피로강도
김태조,최진용,원대희,배태성,亘理文夫,大川昭治 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.3
This study was performed to evaluate the tensile and fatigue strengths of butt joints in titanium soldered with 14K gold and Ti-Ni-Cu alloys. Titanium rods. 30㎜ in length and 3㎜ in dimeter, were polished with #2,000 emery paper and soldered using the electric resistance heating and the infrared radiation heating devices. Tensile test was done with a crosshead speed of 0.5㎜/min, and fatigue test was subjected to a cyclic tensile stress of 30 Hz using tension-type fatigue machine. The solder-matrix interface region and the fracture surfaces were examined by scanning electron microscope. The results obtained were summarized as follows; 1. Mean tensile strength and fatigue strength values of 394.2 MPa and 189.2 MPa were obtained at the joint soldered with 14K gold alloy using the electric resistance heating device. 2. Mean tensile strength and fatigue strength values of 385.2 MPa and 191.2 MPa were obtained at the joint soldered with Ti-Ni-Cu alloy using infrared radiation heating device. 3. Many gas and shrinkage porosities were observed in the both solder joints. 4. partially oxidized surfaces and characteristic striations were observed in the fractured surfaces of the both solder joints.