• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.6
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• pp.2612-2617
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• 2013

This study aims to develop hair cutter with zirconia($ZrO_2$) material whose machinability, corrosion resistance, wear resistance and bio-compatibility are excellent by comparing iron hair cutter. Ultra-thin zirconia cutter with the thickness of 0.253mm is manufactured through the optimization of design, molding, sintering, grinding and grinding process. With observation result of cutter specimen by use of scanning electron microscope(SEM), formability and process of cutting face are shown to be good. It is also evaluated with sufficient merchantability by cutting test results. The cutter process technology of thin zirconia can be utilized at the development of high value-added beauty appliances like razor, beauty-razor and eye brows-razor for woman by use of study result.

• Journal of the Korean Ceramic Society
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• v.27 no.3
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• pp.311-320
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• 1990

Hydroxyapatite powders were synthesized with Ca/P=1.67, 1.70 and pH=7, 11 by precipitation method and fluorine substituted hydroxyapatite ceramics were prepared using these powders. After characterization of these hydorxyapatite bioceramics, chemical bonding between these sepcimens in simulated body fluid was investigated. Bysubstitution of 7.5% of fluorine, hydroxyapatite was prevented to decompose into β-tricalcium phosphate and its sintered density and mechanical strength were increased. The bending strength of these hydroxyapatite ceramics was 137MPa. The hydroxyapatite ceramics chemically bonded each other in Ringer's solution and the component of bonded layer was also hydroxyapatite.

• Korean Journal of Materials Research
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• v.15 no.10
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• pp.671-677
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• 2005

Ti and Ti alloys are known to have excellent corrosion properties, which is an important aspect for biocompability of these implants in human body. In our study, four types of samples (Cp-Ti, Ti-6Al-4V, $0.5wt.\%$ Fe-Ti and ECAP Ti) were tested for their apatite forming ability and corrosion properties. The micropolished samples were treated with 5M NaOH solution at $60^{\circ}C$ for 24 hours. Each samples was gently washed with distilled water and heat-treated at 600"C for 1 hour. The heat-treated samples were soaked in Simulated Body Fluid (SBF) solution at $36.5^{\circ}C$ in an incubator for different period of time. The test revealed that $0.5 wt.\%$ Fe-Ti showing faster apatite growth on the surface (7th day) compared to other samples. Polarization curve test (PCT) was also carried out to determine the corrosion resistance of each samples in SBF solution. ECAP-Ti showed highest corrosion resistance compared to any other samples. $0.5wt.\%Fe-Ti$ showed higher corrosion potential and corrosion current compared to other samples.