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분무열분해 공정에 의한 폐액으로부터 니켈 페라이트 나노 분말 제조
유재근,서상기,강성구,김좌연,박시현,김용수,최재하,손진군,Yu Jae-Keun,Suh Sang-Kee,Kang Seong-Gu,Kim Jwa-Yeon,Park Si-Hyun,Park Yaung-Soo,Choi Jae-Ha,Sohn Jin-Gun 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.4
In order to efficiently recycle the waste solution resulting from shadow mask processing, nano-sized Ni-ferrite powder was fab-ricated through spray pyrolysis process. The average particle size of the powder was below 100nm. In this study, the effects of the reaction temperature. the concentration of raw material solution and the injection speed of solution on the properties of powder were respectively investigated. As the reaction temperature increased from $800^{\circ}C$ to $1100^{\circ}C$, average particle size of the powder significantly Increased and power structure became more solid, whereat its specific surface area was greatly reduced. Formation rate and crystallization of($NiFe_2$$O_4$) phale increased along with the temperature rise. As the concentrations of iron and nickel components in wastere solution increased, particle size of the powder became larger, particle size distribution became more irregular, and specific surface area was reduced. Formation rate and crystallization of $NiFe_2$$O_4$ phase increased significantly along with the increase of the concentration of solution. As the inlet speed of solution increased, particle size of the powder became larger, particle size distribution became wider, specific surface area was reduced and powder structure became less solid. As the inlet speed of solution decreased, formation rate and crystallization of $NiFe_2$$O_4$ phase significantly increased. 본 연구에서는 새도우마스크 제조공정 중 발생되는 Fe-Ni 계 폐산용액을 효율적으로 재활용하기 위하여 폐산용액을 자체 제작한 분무열분해 system을 이용하여 분무열분해시킴에 의해 평균입도 100nm 이하의 니켈 페라이트($NiFe_2$$O_4$)나노 분발을 제조하였으며 반응온도, 용액의 농도 및 용액 유입속도의 반응인자들의 변화에 따른 생성된 분발의 특성변화를 파악하였다. 반응온도가 800∼$1100^{\circ}C$ 로 증가함에 따라 분무열분해 공정에 의해 생성된 분말의 평균입도가 현저히 증가하였고 점점 치밀한 조직을 나타내었으며 비표면적은 크게 감소하였다. 반응온도의 증가에 따라 니첼 페라이트 상의 생성비율 및 결정성이 증가하였다. 원료용액의 농도가 증가됨에 따라 분말의 평균입도는 점점 증가하고 비표면적은 감소하는 반면 입도분포는 더욱 불규칙하게 나타났다. 용액의 농도 증가에 따라 니켈 폐라이트 상의 생성비율 및 결정성은 현저히 증가하고 있었다. 용액의 유입속도 증가에 따라 분말들의 평균입도는 현저히 증가하고 비표면적은 감소하는 반면 입도분포는 불규칙하게 되며 조직의 치밀성도 감소하였다. 용액의 유입속도 감소에 따라 니켈 폐라이트 상의 결정성 및 생성비율이 현저히 증가하고 있었다.
급냉응고법으로 제조된 Ni-Mo-B 계 합금 압출재의 기계적 성질
박원욱,최철진,서상기 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.9
Ribbons of rapidly solidified Ni-Mo-B alloy were produced by chill block melt spinning. Powders were manufactured from ribbons by a pulverizing process and then consolidated by extrusion after heating for 2 hrs at 1100℃. In order to improve the mechanical properties, and additional aging treatment was also performed. The microstructure and mechanical properties of the alloy, such as room and elevated temperature hardnesses, wear resistance, and impact strength, were evaluated. Mechanical properties of the alloy were correlated to the microstructure, in view of the application of the alloy to the high temperature wear resistance fields.