• 제목/요약/키워드: Brazement

검색결과 6건 처리시간 0.018초

알루미나 세라믹과 구리의 브레이징 접합물에 대한 열응력의 유한요소법 해석에 관한 연구 (A Study on Thermal Stress Analysis of Alumina Ceramics to Copper Brazement by Finite Element Method)

  • 전창훈;양영수;나석주
    • 대한기계학회논문집
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    • 제14권3호
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    • pp.547-553
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    • 1990
  • 본 연구에서는 알루미나 세라믹(Al$_{2}$O$_{3}$)재료와 순수구리를 티타늄 용자재로써 접합한 브레이징 접합물내의 냉각후 잔류응력을 유한요소법으로 사용하여 해석하였다.

알루미나/니켈크롬강 접합체의 미세조직 및 접합강도에 미치는 Ag-Cu-Zr-X 브레이징 합금성분의 영향 (Effect of the Alloying Elements in Ag-Cu-Zr-X Brazing Alloy on the Microstructure and the Bond Strength of $Al_2O_3$/Ni-Cr Steel Brazed Joint)

  • 김종헌;유연철
    • 소성∙가공
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    • 제7권5호
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    • pp.465-473
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    • 1998
  • The effect of alloying elements of Ag-Cu-Zr-X brazing alloy on the microstructure and the bond strength of $Al_2O_3/Ni-Cr$ brazed steel joint was investigated. The reaction layer, $ZrO_2$ (a=5.146 ${\AA}$ , b=5.213 ${\AA}$ , c=5.311 ${\AA}$ )was formed at the interface of $Al_2O_3/Ni-Cr$ steel joint by the redox reaction between alumina and Zr. The addition of An and Al to the Ag-Cu-Zr brazing alloy gave rise to changes in the thickness of the reaction product layer and the morphology of the brazement. Sn caused the segregation of Zr was decreased b Al the $ZrO_2$ layer formed at the Ag-Cu-Zr-Al alloy was thinner than that of $ZrO_2$ formed at the Ag-Cu-Zr-An alloy. The fracture shear strength was strongly dependent on the microstructure of the brazement. Brazing with Ag-Cu-Zr-Sn alloy resulted in a better bond strength than with Ag-Cu-Zr or Ag-Cu-Zr-Al alloy.

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AZ31 마그네슘합금과 아연도금강판 이종소재의 레이저 브레이징 특성 (Characteristics of the laser brazing on AZ31 magnesium alloy and Zn coated steel dissimilar joint)

  • 이목영;김숙환
    • 한국레이저가공학회지
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    • 제17권1호
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    • pp.7-12
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    • 2014
  • The dissimilar welding between magnesium alloy and steel sheet was required in automobile industry to increase the strength of the dissimilar joints. Laser brazing is one of the good joining processes for Mg- steel dissimilar joint. In this study, AZ31 magnesium alloy and Zn coated steel dissimilar joint was brazed using diode direct laser with Mg600 filler wire and Superior #21 flux. The wetting of Mg filler wire on Zn coating was very good because of the formation of eutectic phase with low melting temperature. The strength of the brazed joint between AZ31 magnesium alloy and Zn coated steel was 131.3N/mm. The fracture occurred at brazement.

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마그네슘합금과 철강 이종소재의 레이저 브레이징 특성에 미치는 도금층의 영향 (Effects of the Types of Coating on the Laser Brazing Characteristics of Dissimilar Joints between Mg Alloy and Steel Sheet)

  • 이목영;김숙환
    • Journal of Welding and Joining
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    • 제31권4호
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    • pp.7-12
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    • 2013
  • The dissimilar welding between magnesium alloy and steel sheet was required in automobile industry to increase the strength of the dissimilar joints. Laser brazing is one of the good joining processes for Mgsteel dissimilar joint. In this study, the effect of coating materials was evaluated on the laser brazing for the dissimilar joint between AZ31 and coated steels such as Zn, Sn and Ni. Diode direct laser was used to braze the lap-edge joint with Mg600 filler wire and Superior #21 flux. The wettability was best on Zn coated steel. The interlayer was formed at the interface between brazement and steel for all coating materials. The strengths of brazed specimen were 146.5N/mm, 204.6N/mm and 101.6N/mm for Zn, Sn and Ni coated steel respectively.

다이아몬드 Grit(흑연)/ Cu-13Sn-12Ti 필러합금 진공 브레이징 접합체의 젖음성 및 계면반응 (The wetting and interfacial reaction of vacuum brazed junction between diamond grit(graphite) and Cu-13Sn-12Ti filler alloy)

  • 함종오;;이지환
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2009년 추계학술발표대회
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    • pp.66-66
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    • 2009
  • Various alloy system, such as Cu-Sn-Ti, Cu-Ag-Ti, and Ni-B-Cr-based alloy are used for the brazing of diamond grits. However, the problem of the adhesion strength between the diamond grits and the brazed alloy is presented. The adhesion strength between the diamond grits and the melting filler alloy is predicted by the contact angle, thereby, instead of diamond grit, the study on the wettability between the graphite and the brazing alloy has been indirectly executed. In this study, Cu-13Sn-12Ti filler alloy was manufactured, and the contact angles, the shear strengths and the interfacial area between the graphites(diamond grits) and braze matrix were investigated. The contact angle was decreased on increasing holding time and temperature. The results of shear strength of the graphite joints brazed filler alloys were observed that the joints applied Cu-13Sn-12Ti alloy at brazing temperature 940 $^{\circ}C$ was very sound condition indicating the shear tensile value of 23.8 MPa because of existing the widest carbide(TiC) reaction layers. The micrograph of wettability of the diamond grit brazed filler alloys were observed that the brazement applied Cu-13Sn-12Ti alloy at brazing temperature $990^{\circ}C$ was very sound condition because of existing a few TiC grains in the vicinity of the TiC layers.

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다이아몬드 grit(흑연) / Cu-13Sn-12Ti 삽입금속 진공 브레이징 접합체의 젖음성 및 계면반응 (The Wetting and Interfacial Reaction of Vacuum Brazed Joint between Diamond Grit(graphite) and Cu-13Sn-12Ti Filler Alloy)

  • 함종오;이지환
    • Journal of Welding and Joining
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    • 제28권3호
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    • pp.49-58
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    • 2010
  • Various alloy system, such as Cu-Sn-Ti, Cu-Ag-Ti, and Ni-B-Cr-based alloy are used for the brazing of diamond grits. However, the problem of the adhesion strength between the diamond grits and the brazed alloy is presented. The adhesion strength between the diamond grits and the melting filler alloy is predicted by the contact angle, thereby, instead of diamond grit, the study on the wettability between the graphite and the brazing alloy has been indirectly executed. In this study, Cu-13Sn-12Ti filler alloy was manufactured, and the contact angles, the shear strengths and the interfacial area between the graphites (diamond grits) and braze matrix were investigated. The contact angle was decreased on increasing holding time and temperature. The results of shear strength of the graphite joints brazed filler alloys were observed that the joints applied Cu-13Sn-12Ti alloy at brazing temperature $940^{\circ}C$ was very sound condition indicating the shear tensile value of 23.8 MPa because of existing the widest carbide(TiC) reaction layers. The micrograph of wettability of the diamond grit brazed filler alloys were observed that the brazement applied Cu-13Sn-12Ti alloy at brazing temperature $990^{\circ}C$ was very sound condition because of existing a few TiC grains in the vicinity of the TiC layers.