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Cu 에 대한 Sn-3.5Ag 계 땜납의 젖음성 및 계면반응
백대화(Dae Hwa Baek),이경구(Kyung Ku Lee),박효병(Hyo Byeong Park),정명준(Myung Jun Geong),이도재(Doh Jae Lee) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.3
The wettability and interfacial reaction between Sn-3.5Ag solders and Cu-substrate were examined as a function of alloying element (1Pb, 1Sb) and soldering time. Cu/solder joints were subjected to aging treatments for up to 60 days at 150˚C to observe interfacial compounds and changes of microstructure by optical microscopy, SEM and EDS. The addition of 1Pb to the Sn-3.5Ag solder improves the wetting characteristics of the alloy and lowers the melting temperature. The growth rate of the Cu_6Sn_5 layer in the Sn-3.5 Ag solder/Cu was faster than that in the Sn-3.5Ag-1Sb solder/Cu. The activation energy for Cu_6Sn_5 growth was estimated as 31∼35 kJ/mole. (Received January 15, 1999)
주임선의 형태와 용융기전이 Nickel-Chromium 합금의 다공성에 미치는 영향
박효병 광주보건대학 1992 論文集 Vol.17 No.-
Using 3 sort of sprue design, 2 sort of heat source and nickel-chromium alloy, sample of total 36 were constructed, The result of experimental was researched on casting porosity on metal alloy according to the sort of sprue design and that heat source. The results were as follows : 1. The largest volume of casting porosity was direct sprue (closed type), the nest was runner bur type and were type. 2. The influence on casting porosity of sprue design was greater than heat source. 3. When the type of heat source were used oxygen-acetylene and induction method, the volume of casting porosity was little difference.
생체용 Ti-15Sn 계 합금의 내식성 및 기계적 성질에 관한 연구
김대환,이경구,박효병,이도재 한국주조공학회 2000 한국주조공학회지 Vol.20 No.3
The mechanical properties and corrosion resistance of Ti alloys for medical implants have been investigated. Ti, Ti-15Sn-4Nb and Ti-15Sn-4Nb-2Zr alloys were melted in arc furnace and the corrosion resistance of Ti alloys was evaluated by anodic polarization test. The microstructure and mechanical properties of Ti alloys were analysed by optical microscope, hardness and tensile tester. The tensile strength of the pure-Ti improved by addition of Sn and Nb and Ti-15Sn-4Nb alloy showed better Rockwell hardness compared with pure Ti. However, there was no significant difference in corrosion resistance between those Ti-alloys made of Pure-Ti and Ti-15Sn-4N6 alloy. The passive films on the Ti-15Sn-4Nb alloy in air atmosphere consisted of TiO₂, SnO and NbO as demonstrated by X-ray photoelectron spectroscopy(XPS)