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金敎漢 영남이공대학 1983 論文集 Vol.12 No.-
The effects of annealing and subzero treatment on thermal dilation of the Al-Al_3Ni eutectic composite were studied in relation to the residual stress and matrix yielding. For the composite annealed at 500℃ for 1hr, the heating curve forms a hysteresis loop with cooling curve on the test up to 300℃, and a small region of inflection is observed on each curve. By the subzero treatment at-196℃ for 10min, the inflection temperature on heating is lowered, but on cooling, it remains unchanged and no hysteresis loop is formed. In the temperature range which reaches the inflection region on heating and cooling tests, the fiber and the matrix undergo elastic deformation. The matrix begins to yield at the inflection on the heating curve of the subzeroed composite, the inflection region is observed near room temperature corresponds to the matrix yielding. The Al_3Ni fibers in the cycled material developed surface serrations which increased with maximum cycling temperature and number of cycles. The formation of these serrations is attributed to the increasing solubility of the Al_3Ni fibers in the matrix with temperature.
상아질 전처리방법이 4-META/MMA-TBB계 레진의 접착강도가 미치는 영향
김교한,김영빈 대한의용생체공학회 1995 의공학회지 Vol.16 No.4
The present study investigated the effectiveness of pretreatment on dentin bonding. The adhesive resin was 5% 4-methacryloyloxyethyl trimellitate anhydride (4-META) in methyl methacrylate (MMA) combined with poly-MMA powder. Polymerization of this resin was initiated by tri-n-butyl borage (TBB). Ground bovine dentin samples were etched with either an aqueous solution of 10% citric (10-0 solution) (Group I) or aqueous solution of 10% citric acid and 3% ferric chloride(10-3 solution) (Group ll ). After etching, the primer (an aqueous solution of 35% hydroxyethyl methacrylate (HEM- A) and 5% glutaraldehyde was applied on the differently etched surfaces (Group III , Group IV). The 10-0 treatment showed the lowest tensile bond strength, followed by the 10-3 treatment, primer application after the 10-0 treatment and primer application after the 10-3 treatment. The relationship among the surface morphology after pretreatment, fractured surface morphology and tensile bond strength was examined. It revealed that the surface morphology change by different pretreatment influenced the bond strength and the resulting fractured surface morphology. The correlation of tensile bond strength with the fracture morphology was explained.