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- 저자 : 신승렬 ( Seung Ryoul Shin ) (검색결과 4 건)
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소실모형 주조시 알루미늄 합금 용탕의 수소 용해에 관한 연구
신승렬(Seung Ryoul Shin),최현진(Hyun Jin Choi),이경환(Kyong Whoan Lee),이진형(Zin Hyoung Lee) 한국주조공학회 2002 한국주조공학회지 Vol.22 No.4
N/A The hydrogen gas pick-up problem that can occur during Lost Foam Casting was investigated by reduced pressure test and practical Lost Foam Casting. The proper test pressure of reduced pressure test was determined by experiments not to use polystyrene and gas contents of the melt were calculated from density measurement results. There sults showed that the hydrogen pick-up increased with the increased amount of polystyrene that was replaced by melt. The hydrogen pick-up was larger in the case of no degassed melt than that of degassed melt. So the hydrogen pick-up depended on the initial hydrogen content of the melt and the contact time of the melt with the decomposed gas phase. The mold evacuation decreased the hydrogen pick-up and increased the flow length of melt during Lost Foam Casting. And the error of calculated hydrogen pick-up was calculated by numerical method.
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마그네슘 합금의 소실모형주조 시 기포형성 특성에 관한 연구 -알루미늄 합금과 비교-
신승렬 ( Seung Ryoul Shin ),한상원 ( Sang Won Han ),이경환 ( Kyong Whoan Lee ) 한국주조공학회 2004 한국주조공학회지 Vol.24 No.3
N/A The pore formation characteristic of Mg alloy during Lost Foam Casting(LFC) was investigated with reduced pressure test and real casting, which was compared with the results of previous work for Al alloy. Cast Mg alloys in LFC had much lower porosities in comparison with those of Al alloys. Also, the proper pouring temperature gave the minimum porosity like AI alloy although it was higher than that of Al alloys due to the worse fluidity of Mg alloy. The pore formation mechanism of Mg alloy in LFC was similar to that of AI alloy but the critical temperature showing the different mechanism is higher than that of Al alloy as much as 30~50℃. The result that Mg alloy in LFC had the lower porosity comparing with Al alloy was due to the extra solubility of hydrogen gas although the solubility of Al alloy was easily exceeded by the external sources like pyrolyzed polystyrene products. The mold evacuation gave the lower porosity due to the removal of polystyrene pyrolysis products, and reduced shrinkage defects. Also, there was a proper evacuation pressure that gave a porosity of almost 0vol%. But much higher vacuum degree than this proper pressure caused the severe entrapment of polymer pyrolysis products that gave the large porosity.
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김광수,손영아,신승렬 경산대학교 생명자원개발연구소 1999 생명자원과 산업 Vol.3 No.-
매실의 향기성분은 50여종 중 알콜류가 benzyl alcohol, linalool, 1,6-octadien-3-ol, n-haxanol 등 10여종, aldehyde류가 2-hexenal, benzaldehyde, n-hexanal 등 3종, acid류가 butanedionic acid, acetic acid, 2종, 2-iodo-hexane 등 hydrocarbon류가 5종, butanedioic acid-diethyl ester를 포함한 ester류가 3종, β-ionone을 포함한 ketone류가 3종 그리고 기타 성분이 2종이었다. 매실이 성숙함에 따라 향기성분의 수가 증가하고 그 함량도 증가하는 경향이었다. 매실의 비휘발성 유기산의 조성은 succinic, fumaric, oxalic, malic, tartaric 및 citric acid이었다. 매실의 비휘발성 유기산은 성숙 초기에는 malic acid와 oxalic acid의 함량이 높았고, 성숙중기이후에는 malic acid와 citric acid의 함량이 높았다. Citric acid의 함량이 증가한 반면에 대부분의 유기산은 감소하는 경향이었다. 휘발성 유기산은 성숙중에 formic acid함량은 감소하고 butyric acid의 함량은 증가하는 경향이었다. 총 유기산의 함량은 매실 성숙에 현저히 감소하는 경향이었다. Apricot fruits were composited about 50 of flvor components, 10 of alcohol including benzyl alcohol, linaool, 1,6-octadien-3-ol. et al, 3 of aldehyde including 2-hexenal, benaldehyde, n-hexanal, 2 of acid including butannedionic acid, acetic acid, 5 of hydrocarbon including 2-iodo-hexane et al, 3 of ester including butanedioic aciddiethyl ester, 3 of ketone including β-ionone et al. Flavor components of apricot fruits were increased during maturation. Nonvolatile organic acids of apricot fruits were succinic, fumaric, oxalic, tartaric and citric aicd. Contents of malic and oxalic acid were high at 30, May, but contents of malic and citric acid were high after 9, June. Citric acid of nonvolatile organic acids was increased during maturation, but other were decreased during maturation. Formic acid of volatile organic acids was decreased during maturation, but butyric acid was increased. The contents of total organic acid was increased during maturation.
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치과 주조용 Ag-Pd 계 합금의 미세조직에 미치는 S 와 Ir 의 영향
이진형,서용찬,신승렬 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.1
The effects of S and Ir on the microstructures of binary Ag-25%Pd alloy and a commercial alloy, A-2 (Ag-25 wt%Pd-2 wt%Au-2 wt%In-0.84 wt%Zn-0.5 wt%Ir) were studied. The segregation tendency of S in the grain boundary was investigated by Auger electron spectroscopy (AES) and Energy Dispersive Spectroscopy (EDS) with varying S concentrations. The effect of the cooling rate on the microstructures and segregation was also investigated. The compositions of several positions on the fractured surface were measured by EDS analysis. The grain refining effect of Ir was obvious when the concentration of Ir was more than 0.1%. At S-concentrations above 0.1%, Ag₂Pd₃S phase was observed at the dendrite and grain boundary due to S-segregation during solidification. This phase did not appear at 0.01% S, but the S-concentration at the grain boundary was much higher than the bulk concentration, showing S-segregation to the grain boundary. The degree of S-segregation to the grain boundary decreased slightly with grain refining. The segregation of In and Zn in A-2 alloy containing high S concentration did not occur while it occurred in the alloy with low S concentration.
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