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Ag계 Filler Metal을 사용한 YSZ와 STS430의 브레이징 접합시 Ti, Sn의 함량 변화가 접합강도에 미치는 영향
이기영,박현균,Lee, Ki Young,Park, Hyun Gyoon 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.1
In Ti active brazing of YSZ to STS 430 using Ag-Cu Filler Metal, the effect of Ti contents on the shear bonding strength were investigated together with the effect of brazing temperature and holding time. The addition of Ti in Ag-Cu Filler Metal increased the bonding strength up to 4.68% Ti, followed by the decrease with further addition. This seems to be caused by formation of TixOy at the reaction layer. Brazing temperature was optimized at $960^{\circ}C$ among a given temperature ranges. The addion of Sn to Ag-Cu filler metal brought the decrease of its melting temperature its melting temperature without a significant decrease of bonging strength.
Al<sub>2</sub>O<sub>3</sub>/Cu 접합에서 Metallizing paste의 조성이 접합강도에 미치는 영향
윤종혁,박현균,Yoon, Jong-Hyuk,Park, Hyun Gyoon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.6
In joining Alumina to copper plate by Mo-Mn metallizing process, the effects of the composition of metallizing paste on the bonding strength were investigated. The bonding strength increased with increasing Mn amount in the paste up to 20% but followed by the decrease with addition of Mn. The maximum bonding strength reached 50MPa at 20%Mn when heated to $1550^{\circ}C$ for 60minute. The addition of Si to the metallizing powder increased the bonding strength of the joint by enhancing the mechanical bonding between the Alumina and the metallizing layer due to the decrease of layer viscosity with the addition of $SiO_2$. It is thought that MnO reacted with $Al_2O_3$ to yield $MnAl_2O_4$ spinel, forming a joint.
알루미늄 합금에서 Zr첨가가 TiB2의 변형과 결정립크기에 미치는 영향
강원덕 ( Won Duck Kang ),박현균 ( Hyun Gyoon Park ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.8
The poisoning effect of Zr in aluminum alloys was investigated by analyzing the filtered cakes of aluminum alloy melt taken with the Prefil footprinter through a variety of analytic instruments, SEM/EDX, Auger, and TEM. Experimental results indicated that the morphology and chemical composition of the aluminum alloys were not modified with the addition of Zr, which is to previous belief that Zr poisoning is caused by modification of (Ti1-xZrx)Al3. On the other hand, TiAl3 surroundig TiB2 particles was modified and its lattice parameter was more mismatched by increasing Zr content, leading to less nucleation rate. This is also supported by the observation that the poisoning effect is reduced when Ti is added, resulting in a lower content ratio of Zr to Ti. These results suggest that extra Ti should be added to eliminate the poisoning effect of Zr in aluminum alloys containing Zr.
Cu-Fe 합금에서 소성변형과 어닐링 공정조건이 인장강도와 전기전도도에 미치는 영향
우창준 ( Chang-jun Woo ),박현균 ( Hyun Gyoon Park ) 한국열처리공학회 2019 熱處理工學會誌 Vol.32 No.3
Abstract In order to investigate the effect of plastic deformation and annealing process parameters on strength and electrical conductivity of Cu-Fe alloys, Cu-10wt%Fe, Cu-15wt%Fe alloys were drawn up to η=4 and annealed in the temperature range of 300℃ to 700℃, followed by measurements of tensile strength and electric conductivity. As draw strain increases, tensile strength increases while electrical conductivity decreases. These observations result from reduction of dislocation density and decrease in Fe fiber spacing. Raising annealing temperature brought about decrease of tensile strength and increase of electrical conductivity up to 500℃, being followed by decreasing above 500℃. Such results are thought to be caused by decrease of dislocation density below 500℃ and rapid solubility increase of Fe in Cu above 500℃. For the purpose of obtaining both high strength and high conductivity, annealing process should be incorporated just prior to reaching to final draw strain. For Cu-10wt%Fe alloy, the tensile strength 706.9 MPa and the electrical conductivity 54.34%IACS were obtained through the processes of drawing up to η=3, annealing at 500℃ for 1 hour and additional drawing up to total strain of η=4, (Received April 23, 2019; Revised May 14, 2019; Accepted May 16, 2019)
Cu-Al-Mn계 형상기억합금에서 조성이 형상기억특성 및냉간가공성에 미치는 영향
박종배 ( Jong Bae Park ),박현균 ( Hyun Gyoon Park ) 한국열처리공학회 2014 熱處理工學會誌 Vol.27 No.2
Cu-Al-Mn shape memory alloys of a variety of composition were characterized in terms of shape memory properties and cold workability. Cold workability tested by cold rolling indicated that the alloys solution treated in the メ + モ region have a higher ductility than those solution treated in the モ region. Also it is known that cold workability increased with the decrease in Al content in the モ region. This seems to be resulted from the fact that Mn addition causes to expand モ region toward lower Al content and lower order-disorder transition temperature, consequently, モ of excellent workability being frozen even at room temperature. Experimental results regarding shape memory showed that the properties were better with a higher Al contents at a given Mn content, which is closely related with martensi tic transformation. It is also shown that super elasticity limit was enhanced with decrease in the yield strength of alloys because a lower yield strength seems to initiates slip at the lower applied stress.
5Cr 계 열간공구강의 충격인성과 절삭성에 미치는 희토류금속 첨가의 영향
박현균,송치복,소진왕 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8
A small amount of rare earth metals(REM) was added in melts of 5Cr hot working tool steel in order to investigate the changes in cleanliness, shape control of nonmetallic inclusions, and mechanical properties in comparison with those of typical hot working tool steel. The important results obtained are summarized as follows. 1) REM addition in 5Cr hot working tool steel resulted in significant decreases in final oxygen and sulfur, and total nonmetallic inclusions content. 2) RE-complex inclusions in the form of fine globular less than 3㎛ were composed of RE-oxysulfide surrounded by RE-sulfide. 3) Impact toughness, machinability, and chipability were improved by REM addition, owing to the refining of prior austenite grain size and insoluble carbide, and RE-complex inclusions.
박현균,조윤성,문길수,이준항 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8
Noise problem arising from transmission gears of automobiles is well known to be related to the oxidation of gear materials during crburizing and distortion in the subsequent quenching and tempering process. In order to develop new grade steels with minimal internal oxidation layer which has detrimental effects on gear life and noise reduction, the effects of alloying element, Mn, Cr and Si on the internal oxidation behavier during carburization were studied in comparision to the characteristics of internal oxidation for two commmom transmission gear materials, SCM415H, SCR420H. The chemical composition of the new grade is 0,17C -Si$lt;0.13-0.75Mn -1.0Cr -0.40Mo. The hardenability characteristics of new grade steel is equivalent to that of SCM415H and SCr420H and internal oxidation layer depth after case hardening was smaller than those of SCM415H and SCr420H. The depth of internal oxidation layer was decreased with decreasing the amount of Si which has the highest affinity for oxygen.
朴起範,朴炫均,李東馥 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3
Alloys of Ti-47%Al and Ti-47%Al-1%Mn were oxidized isothermally and cyclically between 800 and 1000℃, and their oxidation characteristics were studied. Compared with Ti-47%Al, Ti-47%Al-1%Mn displayed better oxidation resistance at 800℃, slightly better oxidation resistance at 900℃, and worse oxidation resistance at 1000℃, though the scale adherence was better. Manganese tended to present at the lower part of the oxide scale which consisted primarily of an outer TiO_2 layer, and intermediate Al_2O_3-rich layer, and an inner mixed layer of (TiO_2+Al_2O_3).