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용사와 가압알곤가스를 이용한 회주철과 오스테나이트 스테인레스강관의 주조접합에 관한 연구
유황룡,장재명,조남돈 ( Hwang Ryong Yoo,Che Myung Chang,Nam Don Cho ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.3
N/A Cast-in insert of gray iron around austenitic stainless steel pipe was made using thermal spraying of a Ni base self-fluxing alloy and pressurized Ar gas. The microstructures and basic properties of the bonded region were investigated and also practicalities and problems with this method were discussed. The experiments showed that the bonding in the cast-in insert was quite sensitive to the volume ratio of the stainless steel pipe and cast iron, pouring temperature, and other casting conditions, still thermal spraying greatly expanded the region where successful bonding was obtained. The microscopic observation showed that the bonding was metallurgically satisfactory and that there were a carburized layer on the steel pipe, a diffusion zone of sprayed alloy and rapidly solidified cast iron structure. Metal-carbon compounds and martensite formation were also observed in the diffusion zone. The strength of the bonded region was proved adequate by punching tests. Thus, thermal spraying was found effective in cast-in insert.
이채영(Chae-young Lee),유황룡(Hwang-Ryong Yoo) 유기성자원학회 2009 유기물자원화 Vol.17 No.3
본 연구에서는 기계식 전처리에 의한 하수 슬러지의 가용화 효과를 회분식 실험을 통해 조사하였다. 기계식 전처리를 통한 하수슬러지의 가용화는 세포벽의 파괴로 통해 용존성 화학적 산소요구량, 단백질 및 탄수화물의 농도를 증가시키는 것으로 나타났다. 알칼리와 기계식 전처리를 병행하여 슬러지를 가용화한 결과 기계식 전처리만을 수행한 경우에 비해 용존성 화학적 산소요구량이 높은 것으로 나타났다. 혐기성 생분해도 측면에서 기계식 전처리는 메탄 발생량을 증가시키는 것으로 나타났다. 기계식과 알칼리 및 기계식 전처리를 동시에 수행한 경우 각각 24.1%와 44.5%의 생화학적 메탄 잠재능을 향상시키는 것으로 나타나 하수슬러지의 가용화는 혐기성 생분해도 향상에 효과적이다. Disintegration of sewage sludge (SS) was investigated by batch experiments using mechanical pre-treatment. Mechanical disintegration of SS increased the amount of soluble chemical oxygen demand (SCOD), protein and carbohydrate due to the break-up of cell walls. The mechanical disintegration incorporated with alkaline pre-treatment demonstrated higher amount of SCOD compared with mechanical one only. In terms of anaerobic biodegradability, mechanical pretreatment enhanced the anaerobic biodegradation of SS, leading to the methane production improvement. The improvement in BMP for SS treated with mechanical and alkaline-mechanical pre-treatments were 24.1% and 44.5%, respectively. This result suggested that disintegration of SS was effective for improving anaerobic biodegradability.