• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.18 no.5
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• pp.450-456
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• 2005

In this paper, the effect of adhesion properties of semiconductive-insulating interface layer of silicone rubber on electrical properties was investigated. The modifications produced on the silicone surface by oxygen plasma were accessed using ATR-FTIR, contact angle and Surface Roughness Tester. Adhesion was obtained from T-peel tests of semiconductive layer haying different treatment durations. In addition, ac breakdown test was carried out for elucidating the change of electrical property with duration of plasma treatment. From the results, the treatment in the oxygen plasma produced a noticeable increase in surface energy, which can be mainly ascribed to the creation of O-H and C=O. It is observed that adhesion performance was determined by surface energy and roughness level of silicone surface. It is found that at dielectric strength was increased with improving the adhesion between the semiconductive and insulating interface.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.1089-1096
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• 2005

This study was experimental test of edgewise compression properties for aluminum(type-50XX) sandwich panel with thermal environment and surface treatment using adhesive film. There was decreasing $10\%-peel$ strength after thermal environment. Through compressive. buckling mode know to seen of properties of adhesive, sheet and core strength. First case of Chromate to aluminum sheet, know low shear strength of adhesive through buckling mode but case of Beomite to aluminum sheet, know than thin sheet and core low strength through buckling mode.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.1868-1869
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• 2005

이 논문은 반도전 실리콘 고무 표면에 코로나 방전 처리하여 이종의 실리콘 고무와의 접착 특성을 나타낸 것이다. 반도전 실리콘 고무 표면 상태를 발수성 등급에 따른 분류와 FTIR(Fourier Transform Infrared Spectroscopy)를 사용하여 평가하였다. 표면 상태 변화에 따른 반도전 실리콘 고무의 접착 특성은 T-peel test로 접착강도를 시험하였다. 실험 결과 고에너지의 코로나 방전으로 반도전 실리콘 고무의 결합쇄가 절단되었고 이 부분에 산소가 결합되어 극성 관능기를 생성하여 표면을 산화시켰다. 이러한 표면 상태 변화에 따른 접착강도는 초기 상태일 때 보다 코로나 방전 처리 후 증가하는 것을 확인 할 수 있었다. 이 논문을 통하여 코로나 방전 처리는 이종 계면의 접착 특성을 향상시킬 수 있으며, 이종 계면에서 발생하는 절연 파괴 전압을 높여 전기절연 성능을 향상시키는데 도움이 될 것이다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2007.11a
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• pp.166-168
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• 2007

스퍼터링법으로 제작된 FCCL은 PI필름(Poly-imide film)과 Cu layer사이에 Tie-coating layer로 Ni-Cr을 많이 사용한다. 하지만 완성된 FCCL에서 페터닝을 실시할 때 Cr성분이 소멸되지 않고 잔존하는 현상으로 누설전류가 발생 한다. 또한 Cr으로 인해 Eatching액의 오염으로 재사용의 어려움도 발생된다. 이러한 원인들은 제품의 특성들을 저하 시키므로 이를 개선할 필요가 있다. 따라서 본 연구에서는 기존의 Tie-coating layer를 대체할 물질로 Acrylic acid를 이용하여 FCCL을 제작하여 표면특성 평가를 위해 Contact angle측정과 부착력을 위한 Peel test측정과 조직분석 및 성분분석을 위해 SEM-EDS를 측정을 통하여 Polymerization을 이용한 Ti-coating layer 개발의 가능성을 확인하였다.

• Korean Journal of Materials Research
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• v.9 no.3
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• pp.301-306
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• 1999

Cu/Cr/polyimide 계에서 금속박막 두께와 폴리이미드 표면의 플라즈마 전처리 조건에 따른 필 테스트 결과로부터 Park와 Yu의 X-선 측정에 의한 방법과 Moidu등의 이론적 방법을 통애 Cr/polyimide 계면균열의 계면파괴에너지를 구했다. 두 방법으로 구한 박막의 소성일과 계면파괴어네지는 대부분의 경우에 대해 서로 잘 일치하였으며, 이와 같은 실험적 방법과 이론적 방법 모두 계면파괴에너지의 측정에 유용함을 알 수 있었다. 계면파괴에너지는 박막 두께에 거의 무관하였으며, 0.03, 0.036 그리고 0.05 W/$\textrm{cm}^2$의 rf플라즈마 밀도에 대해 각각 $46.8\pm$17.8, $170.3\pm$42.9 그리고 $253.9\pm$44.4 J/$\m^2$의 계면파괴에너지를 얻었다.

• Journal of the Korean institute of surface engineering
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• v.29 no.3
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• pp.157-162
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• 1996

The effects of microstructural change on the adhesion strength between Cu/Cr film and polyimide have been studied. Cr films (50 nm thick) and Cu films (500 or 1000 nm thick) were deposited on polyimide by DC magnetron sputtering. During Cu deposition the Ar pressure was 5 or 100 mtorr. The microstructure was observed by SEM and the adhesion was measured by T-peel test. Plastic deformation of peeled metal strips was characterized quantitatively by using XRD technique. The film in which Cu is deposited at 100 mtorr has higher adhesion strength than the film in which Cu is deposited at 5 mtorr. And in the film with same deposition pressure of 100 mtorr, the adhesion strength is increased as the deposited thickness increases from 500 to 1000 nm. The adhesion change of Cu/Cr can be interpreted as the difference in plastic deformation.

• Food Science and Preservation
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• v.2 no.1
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• pp.139-146
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• 1995

Soluble solids and total carbohydrates of Citrus miyakawa wase harvested middle of November 1993 Topyung-Dong, Seogwipo-si, and Cheju were 10.7 and 8.57%, and carbohydrate was consisted of about 1/2 sucrose, 1/4 glucose and 1/4 fructose, respectively. Acid content of citrus Juice was 1.04%, and citric acid was 74.27% of total organic acids. Fruit weight, peel thickness, soluble solids, pH, hardness and edible part ratio had a good correlation in linear function with increasing fruit size. Total carbohydrate, reducing sugar and vitamin C of citrus jam made on optimum conditions were 65.33%, 27.98%, and 51.40mg/100g , respectively. Microbial growth on the products were not recognized at 3$0^{\circ}C$ for a month. Compared with other related citrus jellying products, the test sample was excellent in appear ance, taste and total preference degree on sensory evaluation.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.1
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• pp.115-126
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• 2001

In this paper, through a series of comparative experiments, effects of two different cure processing methods, cocure and precure, on the mechanical properties of honeycomb core materials for aircraft applications are considered. Mass of moisture accumulated into the closed cells of the sandwich panel specimen from the measured mass of moisture diffused to the full saturation state into the elements(skin, adhesive layer, Nomex honeycomb), consisting the honeycomb sandwich specimen has been calculated. Water reservoir of 70$\^{C}$ was used to have specimens absorb moisture to see the influence of moisture absorbed into sandwich panel on its mechanical properties. For the repair condition holding for 2 hours at 177$\^{C}$(350℉) temperature, a pressure due to the vapor expansion in each cell of the sandwich panel, which may result in the local separation of the interface between laminated skin and the surface of the honeycomb, has been estimated by vapor pressure-temperature relation from the thermodynamic steam table and compared to the pressure from the ideal gas state equation. The bonding strengths of the laminated skins on the flat surface of the Nomex honeycomb have been compared by the flatwise tension test and climbing drum peel test performed at room temperature for dry, wet and wet-repair specimens, respectively.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.05a
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• pp.173-178
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• 2005

The tile construction methods for existing have been used materials within limit which adhesion by wet method in masonry wall and concrete structure. These existing adhesive tech can caused many problems in construction of large and reform tile, after that it can be happened loose scale, peel off, falling off tile by heat and vibration or impact. In according to, this study is to test tile for bond stability, adhesive property by impact, vibration. low property by heat and then, we have the results as below; (1) The tile adhesive stability can be effected as adhesive area between bond agent and tile, adhesive area can more wide and press enough to ensure property. (2) Existing adhesive strength and standard relative tile construction is limited to adjust performance tile on the concrete and masonry wall. In summary, It is necessary to establish standard of performance and test method to ensure tile adhesive salability in dry wall.

• Journal of the Korean Society for Heat Treatment
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• v.20 no.4
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• pp.195-202
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• 2007

Corrosion resistance and torque of M10 bolt coated with Magni 565 were investigated. Corrosion protection mechanism were also studied with the microstructure of coating film. The bolts with the optimum conditions showed around $10{\mu}m$ layer thickness, a great corrosion resistance in salt spray test and a proper torque in torque/tension test. But torque coefficient k increased with the number of bolting and clamping force of M10 bolt showed significantly lower than that of specified value 28.3kN. It was thought that the repeated bolting made the coating film peel off and powdery. The sample coated with optimum coating conditions showed more higher polarization resistance and corrosion potential than the specimens of top and base coat only. The base coating film was composed of lamellar zinc flakes, which provides a large sacrificial cathodic protection. Meanwhile, the top coating film was composed of organic aluminium pigments layer, which provides barrier protection to the corrosion circumstances.