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강춘식,정재필 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
The mechanisms of the liquid metal formation at Ni/B/Ni (Ni: base metal, B: insert material) joint, which could be characterized as liquid phase diffusion bonding, has been investigated. Fine boron (B) powders (under 300 mesh) were coated on the elaborately polished bonding surfaces as an insert material. The specimen packed in quartz tube under 5×10^(-3) torr vacuum was heated in a induction furnace to 1283K-1473K. It is observed that inserted material B was diffused into base metal, and that liquid metal was formed by the reaction of B and Ni. Liquid metal was formed preferentially at the grain boundaries. The state of phases was analyzed to depend on B content because of the fact that content of B on the liquid layer was higher than the solid state base metal.
Si3N4-304 스테인리스강 접합체의 계면조직과 접합강도에 대한 Ag-Cu 기 브레이징 합금내 첨가원소의 영향 (1) : Mo 첨가 영향 Effect of Mo Addition
강춘식,이우천 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.10
Joinning of 304 stainless steel to Si₃N₄, ceramic using Cu-48%Ag-3.8%Ti brazing alloy was made in vacuum furnace. Effect of Mo addition in Cu-Ag-Ti alloy, brazing temperature, and brazing time on interfacial reactions and banding strength of Si₃N₄-304 joints were investigated. Bonding strength was determined by fracture shear loading and high shear strength value of more than 180 ㎫ were obtained for joints brazed with Cu-Ag-Ti- Mo alloy at 1083 K for 1.2 ks. The strong bonding is attritutable to the formation of FeTiSi and TO_5Si₄ by redox reaction between Si₃N₄ and Ti at Si+3N₄ ceramic interface. Thickness of interfacial reaction layer was increased and bonding strength was decreased as brazing temperature and brazing time were increased. It was found that interfacial reaction was retarded by Mo addition.
강춘식,정재필,이진영 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.5
A new method of diffusion bonding(named as Melting Induced Diffusion Bonding) which aimed to make better Transient Liquid Phase(TLP) bonding was developed and applied to the bonding of 304/304 stainless steel. On a new method, boron layer was used as a insert material and its melting point is higher than that of the base metal, therefore insert doesn't melt during bonding, which is different from TLP bonding and brazing. Base metal is bonded by melting of base metal itself which is caused by the reaction of base metal with boron during bonding. By applying a new bonding method to 304 stainless steel, we obtained 421㎫ tensile strength and 17% elongation of the bonded joint.
알루미나-강 접합부의 계면반응과 접합강도에 대한 브레이징변수의 영향
강춘식,이우천 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.4
Joining of 304 stainless steel to alumina ceramics using Cu-48%Ag-3.8%Ti brazing alloy was made in vacuum furnace. Effects of Sn and Al addition in Cu-Ag-Ti alloy, brazing temperature, and brazing time on interfacial reactions and bonding strength of alumina-304 joints were investigated. Bonding strength was determined by fracuture shear loading. The strong bonding is at tributable to the formation of Cu₂Ti₄O by redox reaction between Al₂O₃ and Ti at alumina interface. Thickness of interfacial reaction layer was increased and bonding strength was decreased as brazing temperature and brazing time were increased. Interfacial reaction was accelerated by Sn addition and was restrained by Al addition in brazing alloy.
B 를 삽입재로 사용한 STS 304 강의 등온응고확산접합
강춘식,정재필,이충도 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.3
A new diffusion bonding method (named as Melting Induced Diffusion(MID) bonding) which aimed to make better Transient Liquid Phase(TLP) bonding was developed and applied to the bonding of 304/304 stainless steel. In this research boron powder was used as a insert metal. The width of reacted layer of the bonded joint had linear relationship with square root of bonding time. And the bonded ratio of the joint increased with bonding time. As a result of tension test, tensile strength far room temperature were about 200㎫.
오스테나이트계 스테인레스강의 마찰압접시 압접조직과 열적거동에 관한 연구
강춘식,정태용 대한용접접합학회 1990 대한용접·접합학회지 Vol.8 No.1
The transient temperature distribution in the continuous friction welding 304 stainless steel bars is investigated by experimental and analytical methods. It is calculated by F.D.M. (finite difference method). The heating pressure, the rotational speed and friction coefficient obtained from experiment are used to determine the heat input at the contacting surface. Thermal properties of the workpiece are the function of temperature. The calculated temperature is well coincided with the measured value. The grain size at weld interface is extremely small due to the severe plastic deformation at high temperature, and result of this refined zone reveals higher hardness value. Because the HAZ is very narror about 2-3 mm, welding defects do not occure.
염수분무환경에서 AZ91D 마그네슘 합금의 부식거동에 미치는 결정립 크기의 영향
강춘식,이충도,신광선 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.9
The corrosion behaviors with grain refinement were investigated on the AZ91D magnesium alloy. The grain size was controlled by the inoculation and the change of pouring temperature, the use of cone-type permanent mold. The salt spray test was conducted for 480 hours following ASTM B 117 specification. And the corroded surface and corrosion products were analyzed by SEM and XRD, respectively. Both the corrosion rate and the corrosion depth were markedly decreased by the fine distribution of second phase due to the grain refinement. The relationship between corrosion rate and grain size in the present study could be well predicted the corrosion rate of as-cast AZ91D alloy that have a range of grain size in commercial castings. The corrosion products were consisted of Mg(OH) ₂ and chlorides mainly.