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과공정 Al-Si 합금의 용탕처리 조건에 따른 초정 및 공정 Si 의 동시 미세화
김동규,유보종,박종익,김영섭 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.6
The effects of melt holding time and various melt treatment conditions such as phosphorus treatment, simultaneous treatment after remelting of phosphorus treated alloy, and strontium treatment one hour after phosphorus treatment on the simultaneous refinement of primary and eutectic silicon in hypereutectic Al-Si alloy were studied. In case of simultaneous treatment with 0.04%P and 0.05%Sr, the size of primary silicon particles increased with melt holding time and started to decrease after one hour and modified microstructure was maintained during melt holding time for four hours. In case of strontium treatment after remelting of phosphorus treated alloy, the size of primary silicon particles increased with melt holding time and started to decrease after 30 minutes and eutectic Si modification was achieved during melt holding time for four hours. Strontium treatment after remelting of phosphorus treated alloy showed the smallest primary Si particle size among the melt treatment conditions.
2단 가스분무기의 공정변수에 따른 분사조건의 변화에 관한 연구
김동규,유보종,박종익 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.2
The effects of atomization variables such as protrusion, primary and secondary atomizer gas pressure, and gap between primary and secondary atomizer on the spray condition were studied by two stage atomizer with water as spraying material. Spray condition was improved with decreasing protrusion value and with increasing gas pressure of primary atomizer, due it is thought to countervail of the scattering and upward component of secondary atomizing gas by primary one directed downwards. With increasing the gas pressure of secondary atomizer, the breaking point rised to atomizer and splash-back occured intensely. Good spray condition was achieved in case of the gas pressure ratio of primary and secondary atomizer got the value of 0.5-1.