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朴憲範,權赫茂 충남대학교 공업교육연구소 2000 論文集 Vol.23 No.1
Water and oil were completely mixed with ultrasonic vibration energy irradiation. And during the ultrasonic vibration energy irradiation into A1 melt, added pure Pb, in 750%. And the ultrasonic vibration energy was applied to A1-Pb melt to enhance the miscibility. Microstructural analysis, thermal analysis and X-ray diffraction analysis were caried out to evaluate the effect of the ultrasonic vibration energy on the castability and microstructural reliability. (1) Using the ultrasonic vibration energy irradiation, the complete mixing of water and oil was obtained. (2) Much finer microstructure was obtained in A1-Pb alloys with the application of ultrasonic vibration energy. (3) Relatively large Pb particles, 5㎛ were most distributed along the grain boundaries with fine Pb particles evenly distributed in the matrix. (4) The solubility of Pb in A1-Pb alloys was found to increase up to 5% with the application of ultrasonic vibration energy.
박헌범,권혁무 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.8
To investigate the effects of graphite contents on the mechanical and vibration damping properties, through manufacturing Al/Gr. composites by compacting and extruding Al and graphite powders, rolling its specimen up to 80%, and testing the specimen for its hardness, tensile strength, vibration damping, etc. The followings are the results as; microstructure observation showed that the Al/Gr. composites are uniformed distribution, which means its adequacy for composites. When Al/Gr. composites was rolled, the graphite shape was modified to plate shape at the parallel side to the rolling direction. According to the result of hardness tests on graphite, the more the graphite content and the smaller the rolling ratio, the less the hardness. The result of tensile strength tests show that the tensile strength increase as the graphite content deceases or the rolling ratio increases. The more the graphite content or the smaller the rolling ratio, the bigger the vibration damping coefficient. When Al contains graphite up to 15%, the tensile strength decreases by 27%, whereas, the vibration damping coefficient increases by 80%, which means inverse proportional relationship between the two.
Al / 흑연 압출재를 이용한 Al-Si / 흑연 복합재료 제조와 감쇠능
박헌범(Hun Berm Park),권혁무(Hyuk Moo Kwon) 한국주조공학회 2001 한국주조공학회지 Vol.21 No.2
Al/15%Gr. composite have been manufactured by mixing, compacting, and extruding aluminum powder and graphite powder. Then, Al-6%Si/x%Gr., Al-12%Si/x%Gr., and Al-18%Si/x%Gr.(x : 0, 2, 4, 6, 8) composites have been manufactured by remelting the extruded materials(Al/15%Gr.), Al-33.3%Si alloy, and Al ingot, etc. We conduced experiments to characterize the microstructure, and damping properties and hardness. The result of microstructure experiment on Al-x%Si/y%Gr. composites reveals the good dispersion of graphite. As to Al-Si/y%Gr. composites, the more the graphite contents, the less the tensile strength. And the tensile strength varied according to contents of Si: with it highest valute in Al-18%Si/y%Gr. composites and lowest in Al-6%Si/y%Gr. composites. As to Al-x%Si/y%Gr. composites, the more the contents of graphite, the more the vibration damping properties. And we can get the highest vibration damping rate in Al-12%Si/y%Gr. composites which matrix structure is an eutectic components.
아공정 구상흑연주철의 Fading 거동에 미치는 탄소당량의 영향
박헌범 ( Hun Berm Park ),박상준 ( Sang Jun Park ) 한국주조공학회 2004 한국주조공학회지 Vol.24 No.5
N/A The effect of carbon equivalent on the fading behavior of hypoeutectic ductile cast iron was investigated. The carbon content was slightly increased right after graphite spheroidization treatment and remained almost constant with holding at 1,490℃ after 4 minute. The residual magnesium content was decreased slowly with holding. The empirical equation expressing the relationship between this and holding time was proposed ; C = C_(o) - P×t. The proportionality constant, P, was inversely proportional to carbon content.
초음파진동 조사장 내에서 Al-Pb계 합금의 제조 및 조직
박헌범 ( Hun Berm Park ) 한국주조공학회 2002 한국주조공학회지 Vol.22 No.5
N/A Water and oil were completely synthesised with ultrasonic vibration energy irradiation, Pure Pb were added into Al melt during irradiated the ultrasonic vibration energy in 750. And the ultrasonic vibration energy was applied to Al-Pb melt to enhance the miscibility. Microstructural analysis, thermal analysis and X-ray diffraction analysis were carried out to evaluate the effect of the ultrasonic vibration energy on the castability and microstructural reliability. (1) Using the ultrasonic vibration energy irradiation, the complete mixing of water and oil was obtained. (2) The microstructure was refined by the application of ultrasonic vibration energy in Al-Pb alloys. (3) Relatively large Pb particles, 5㎛ were most distributed alone the grain boundaries with fine Pb particles evenly distributed in the matrix. (4) The solubility of Ph in Al-Pb alloys was increases up to 5% with the application of ultrasonic vibration energy.