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박영수(Yeong-Su Park),박동규(Dong-Kyoo Park),김동주(Dong-Ju Kim),홍동욱(Dong-Uk Hong) 한국열환경공학회 2021 열환경공학 Vol.16 No.1
There is an increasing demand for fueling technology using sewage sludge that is generated during the sewage treatment process. However, there are several challenges to cope with the expanding sewage sludge fueling market. One of them is the problem of stably treating heavy metals contained in sewage sludge. Combustion melting technology is a way to solve these heavy metal-related problems, but commercialization is limited due to high operating costs. Meanwhile, due to the difficulty of securing a landfill for incineration ash treatment, the cost of landfill is rapidly increasing, and the demand for combustion and melting technology is increasing. In this study, the effect of oxygen enrichment rate on the combustion and melting characteristics of sewage sludge solid fuel was investigated through combustion exhaust gas composition, combustion efficiency, slagging rate, weight reduction rate, and volume reduction rate.
Fe-(Mo-Mn-P)-xSi계 합금의 성형밀도에 따른 소결거동
정우영,옥진욱,박동규,안인섭,Jung, Woo-Young,Ok, Jin-Uk,Park, Dong-Kyu,Ahn, In-Shup 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.5
The addition of a large amount of alloying elements reduces the compactibility and increases the compacting pressure, thereby shortening the life of the compacting die and increasing the process cost of commercial PM steel. In this study, the characteristic changes of Fe-Mo-P, Fe-Mn-P, and Fe-Mo-Mn-P alloys are investigated according to the Si contents to replace the expensive elements, such as Ni. All compacts with different Si contents are fabricated with the same green densities of 7.0 and $7.2g/cm^3$. The transverse rupture strength (TRS) and sintered density are measured using the specimens obtained through the sintering process. The sintered density tends to decrease, whereas the TRS increases as the Si content increases. The TRS of the sintered specimen compacted with $7.2g/cm^3$ is twice as high as that compacted with $7.0g/cm^3$.
Fe-(Mo,Mn)-P계 Lean alloy의 소결특성에 미치는 Si와 Sn의 영향
정우영,옥진욱,박동규,안인섭,Jung, Woo-Young,Ok, Jin-Uk,Park, Dong-Kyu,Ahn, In-Shup 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.4
A lean alloy is defined as a low alloy steel that minimizes the content of the alloying elements, while maintaining the characteristics of the sintered alloy. The purpose of this study is to determine the change in microstructure and mechanical properties due to the addition of silicon or tin in Fe-Mo-P, Fe-Mn-P, and Fe-Mo-Mn-P alloys. Silicon- or tin-added F-Mo-P, Fe-Mn-P, and Fe-Mo-Mn-P master alloys were compacted at 700 MPa and subsequently sintered under a $H_2-N_2$ atmosphere at $1120^{\circ}C$. The sintered density of three alloy systems decreases under the same compacting pressure due to dimensional expansion with increasing Si content. As the diffusion rate in the Fe-P-Mo system is higher than that in the Fe-P-Mn system, the decrease in the sintered density is the largest in the Fe-P-Mn system. The sintered density of Sn added alloys does not change with the increasing Sn content due to the effect of non-dimensional changes. However, the effect of Si addition on the transverse rupture strengthening enhancement is stronger than that of Sn addition in these lean alloys.
P/M Fecralloy 성형체의 고온산화 및 전기저항 안정성에 미치는 SiO<sub>2</sub> 첨가 효과
박진우,옥진욱,정우영,박동규,안인섭,Park, Jin-Woo,Ok, Jin-Uk,Jung, Woo-young,Park, Dong-kyu,Ahn, In-Shup 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.4
A metallic oxide layer of a heat-resistant element contributes to the high-temperature oxidation resistance by delaying the oxidation and has a positive effect on the increase in electrical resistivity. In this study, green compacts of Fecralloy powder mixed with amorphous and crystalline silica are oxidized at $950^{\circ}C$ for up to 210 h in order to evaluate the effect of metal oxide on the oxidation and electrical resistivity. The weight change ratio increases as per a parabolic law, and the increase is larger than that observed for Fecralloy owing to the formation of Fe-Si, Fe-Cr composite oxide, and $Al_2O_3$ upon the addition of Si oxide. Si oxides promote the formation of $Al_2O_3$ and Cr oxide at the grain boundary, and obstruct neck formation and the growth of Fecralloy particles to ensure stable electrical resistivity.
SUV 보행자 LOWER LEGFORM 해석 대 시험 상관성 개선 연구
하창욱(Ha Chang Uk),박동규(Park Dong Kyou) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The prupose of this research is to introduce the correlation between FEA and TEST for a pedestrian Lower Legform on SUV. Recently, Domestic and Europe have been evaluating the K-NCAP and Euro-NCAP for pedestrian. Until now, it has been applied the 1st regulation on pedestrian protection on Europe, but It will be applied the 2nd regulation in 2013 on domestic and Europe. But SUV is worse than passenger cars to meet the pedestrian performance. Because it has a high ground point on the center of bumper beam, approach angle over 25°. Therefore, In this research we show the result of the correlation analysis methods that include the Mesh type, boundary condition, sensor measurement and Test VS Analysis Error.