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RISS 인기검색어
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- 저자 : 조문규 ( Mun Kyu Cho ) (검색결과 2 건)
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정우광,권오덕,조문규,Jung, Woo-Gwang,Kwon, Oh-Duck,Cho, Mun-Kyu 한국재료학회 2009 한국재료학회지 Vol.19 No.9
In order to provide the mechanism of nozzle clogging, recovered nozzles for high strength steel grade were examined carefully after continuous casting. The thickness of clogged material in SEN is increased in the following order: from the bottom to the top of the nozzle, upper part of slag line, and the pouring hole. Nozzle clogging material begins to form due the adhesion of metal to nozzle wall, the decarburization, and reduction of oxide in the refractory by Al and Ti in the melt. The reduction of oxide in the refractory by Al and Ti improves the wettability of the melt on the refractory and forms a thin Al-Ti-O layer. Metal containing micro alumina inclusions is solidified on the Al-Ti-O layer, and the solid layer grows due to the heat evolution through the nozzle wall. Thermodynamic calculation has been made for the related reactions. The effect of superheat to the nozzle clogging is discussed on ultra low carbon steel and low carbon steel.
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연속주조용PorousNozzle의기공율이내구성에미치는영향
윤상현 ( Sang Hyeon Yoon ),이희수 ( Hee Soo Lee ),조문규 ( Mun Kyu Cho ),정두화 ( Doo Hoa Jeong ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.7
This study investigates the effects of porosity on the thermal stability and the thermal shock resistance of a porous nozzle used for blowing an inert gas. The samples of Al2O3-SiO2-ZrO2 system, which had the apparent porosity of 16~30% and bulk density of 2.6~3.2 g/cm3, were prepared by adding different graphite contents (5, 10, 20 wt%) as a pore-forming agent. The thermal shock test was conducted at ΔT=500, 1000, and 1400℃ also and the thermal stability was also carried out at 1550, 1600, and 1650℃ for 5 hrs. The specimen contained 10 wt% graphite had uniform pore size distribution, whereas the specimen with 20 wt% graphite showed non-uniform pore size distribution. As a result of thermal shock test, the specimen containing 10 wt% graphite appears to have higher mechanical strength than the other specimens (5, 20 wt% graphite). Both the 5 wt% and 20 wt% graphite specimens developed a non-uniform pore size distribution and cracks that were generated by intensive thermal stress.
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