• 제목/요약/키워드: Ceramic/metal joint

검색결과 41건 처리시간 0.026초

세라믹/금속접합재의 강도에 미치는 열사이클 영향 (Effect of Thermal Cycle on Strength of Ceramic and Metal Joint)

  • 박영철;오세욱;김광영
    • 대한기계학회논문집
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    • 제18권7호
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    • pp.1664-1673
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    • 1994
  • As a fundamental study on effects of thermal-cycles on residual stress of ceramics/metal joints, residual stresses in $Si_3N_4$/SUS304 joint specimens were measured before and single thermal-cycle by X-ray diffraction method and finite element method(FEM). The residual stress was found to increase after single thermal-cycle, which was agreeable with the results of residual stress measurement by X-ray diffraction method and residual stress analysis by finite element method. After the residual stress measurement, 4-point bending tests were performed. The relationship between the bending strength, the thermal-cycle temperature and hold time was examined. The bending strength was found to decrease with the increase of residual stress in linear relation.

Ag-Cu-Ti Brazing 금속을 이용한 Inconel/$Si_3N_4$ 접합의 계면구조 (Interfacial Structure of Inconel/$Si_3N_4$ Joint Using Ag-Cu-Ti Brazing Metal)

  • 정창주;장복기;문종하;강경인
    • 한국세라믹학회지
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    • 제33권12호
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    • pp.1421-1425
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    • 1996
  • Sintered Si3N4 and Inconel composed of Ni(58-63%) Cr(21-25%) Al(1-17%) Mn(<1%) fe(balance) were pressurelessly joined by using Ag-Cu-Ti brazing filler metal at 950℃ and 1200℃ under N2 gas atmosphere of 1atm and their interfacial structures were investigated. In case that the reaction temperature was low as 950℃ its interfacial structure was "Inconel metal/Ti-rich phase layer/brazing filler metal layer/Si3N4 " Ti used as reactive metal existed in between inconel steel and brazing metal and moved to the interface of between brazing filler metal nd Si3N4 according as reaction temperature increased up to 1200℃. The interfacial structure of inconel steel-Si3N4 reacted at 1200℃ was ' inconel metal/Ni-rich phase layer containing of Fe. Cr and Si/Cu-rich phase layer containing of Mn and Si/Si3N4 " Cr Mn, Ni and Fe diffused to the interface of between brazing filler metal and Si3N4 and reacted with Si3N4 The most reactive components of ingredients of inconel metal were Cr and Mn. On the other hand Ti added as reactive components to Ag-Cu eutectic segregated into Ni-rich phase layer,.

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다층중간재를 사용한 질화규소/스테인레스 강 접합체의 잔류응력 해석 및 기계적 특성 (FEM Residual Stress Analysis and Mechanical Properties of Silicon Nitride/Stainless Steel Joint with Multi-Interlayer)

  • 박상환;김태우;최영화
    • 한국세라믹학회지
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    • 제33권2호
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    • pp.127-134
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    • 1996
  • The thermal residual stresses were estimated for brazed Si3N4/S.S.316 joints with Cu/Mo multi-interlayers using FEM, and their bending strengths at room temperature were measured for various interlayer configura-tions. The Cu, Mo multi-interlayer decreased the maximum residual stress in Si3N4 and caused the residual stress redistribution rsulting in the high residual stress at Mo interlayer. The stress distribution in the joints as well as the maximum residual stress in silicon nitride were found to be main factors for determining bending strengths and Weibull modulous of the joints. The bending strength of the brazed Si3N4/S.S.316 joints with specific Cu, Mo multi-interlayer system were found to be above 400 MPa.

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세라믹-금속 브레이징 접합조인트의 고온 접합강도에 관한 연구 (High Temperature Flexural Strengths of the Ceramic-Metal Brazed Joints)

  • 이수정;정명영;이대길;구형회
    • 대한기계학회논문집A
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    • 제20권2호
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    • pp.520-528
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    • 1996
  • Four point bending tests of the brazed joint composed of sintered silicon nitride and 0.2% carbon steel with Cusil ABA filler which were fabricated at 86$0^{\circ}C$ were performed at temperatures, 25, 100, 200, 300, 400, 50$0^{\circ}C$ From the experiments, the maximum bending strength was measured at 30$0^{\circ}C$ From the 3D FE analysis of the residual stress of the brazed joint, it was revealed that the thermally induced residual stresses were minimized when the environmental temperature was 35$0^{\circ}C$ Considering the degradation of the filler material at high temperatures, it was calculated that the maximum bending strength of the brazed joint occured just below the temperature of the minimum thermal residual stress and the thermal residual stress was the dominative parameter of the brazed joint.

활성 용가재를 이용한 세라믹 및 스테인레스강의 접합 (Ceramic and stainless steel brazing by active filler metal)

  • 김원배;김숙환;권영각;장래웅;배석천
    • Journal of Welding and Joining
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    • 제9권4호
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    • pp.17-27
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    • 1991
  • The direct brazing technology which could be used for the simplification of brazing process and the improvement of brazed joint quality was studied with $Al_2O_3$ and stainless steels. The brazing of $Al_2O_3$ to STS304 or STS430 was performed under different brazing conditions such as brazing filler metal, temperature, heating rate and brazing time. Microstructural observation and chemical analysis be SEM/EPAM were carried out to verify the quality of brazed joints. 4-point bending strength of brazed joints was also measured to find the optimal brazing conditions. The results showed that, in brazing of $Al_2O_3$, the mixed oxide layer resulted from the reaction between Ti in filler metal and oxide layer on the material surface to be brazed was found to be bery important for the joint quality. The width of oxide layer varied with the brazing conditions such as brazing time, heating rate and chemical composition of filler metals. The strength of brazed joints was more affected by the type of materials and their thermal properties than by brazing heat cycle.

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질화규소/금속 접합재에 대한 혼합모드의 파괴기준 및 파면해석 (Analysis of Fracture Surface and Fracture Criterion of Mixed Mode is $Si_{3}N_{4}$ Metal Bonded Joints)

  • 정남용
    • 한국생산제조학회지
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    • 제8권2호
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    • pp.86-93
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    • 1999
  • Ceramic/metal bonded joints have led to increasing use of structural materials such as automobiles and heat engines. A method of strength evaluation focussing on fracture criterion of mixed mode was investigated in {{{{ {Si }_{3 } {N }_{4 } }}}}/metal bonded joint, Also Fracture toughness tests of {{{{ {Si }_{3 } {N }_{4 } }}}}/metal bonded joints with an interface crack were carried out and the stress intensity factors of these joints were analyzed by boundary element method. Form the results the fracture criterion and method of strength evaluation by the fracture toughness were proposed in {{{{ {Si }_{3 } {N }_{4 } }}}}/Metal bonded joints

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질화규소/금속 접합재에 대한 파괴기준 및 파괴거동 (Fracture Criterion and Fracture Behavior in Si3N4/Metal Bonded Joints)

  • 김기성
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1998년도 춘계학술대회 논문집
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    • pp.233-238
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    • 1998
  • Recently, the uses of ceramic/metal bonded joints for structural materials have increased in various engineering fields such as automobiles, heat engines, and so on. A method of strength evaluation focussing on fracture criterion of mixed was investigated in Si3N4/metal bonded joint. Also, Fracture toughness tests of Si3N4/metal bonded joints with an interface crack were carried out and the stress intensity factors of these joints were analyzed by boundary element method. From the results, the fracture criterion and method of strength evaluation by the fracture toughness were proposed in Si3N4/metal bonded joints

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Recent updates for biomaterials used in total hip arthroplasty

  • Hu, Chang Yong;Yoon, Taek-Rim
    • 생체재료학회지
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    • 제22권4호
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    • pp.259-270
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    • 2018
  • Background: Total hip arthroplasty (THA) is probably one of the most successful surgical interventions performed in medicine. Through the revolution of hip arthroplasty by principles of low friction arthroplasty was introduced by Sir John Charnley in 1960s. Thereafter, new bearing materials, fixation methods, and new designs has been improved. The main concern regarding failure of THA has been the biological response to particulate polyethylene debris generated by conventional metal on polyethylene bearing surfaces leading to osteolysis and aseptic loosening of the prosthesis. To resolve these problems, the materials of the modern THA were developed since then. Methods: A literature search strategy was conducted using various search terms in PUBMED. The highest quality articles that met the inclusion criteria and best answered the topics of focus of this review were selected. Key search terms included 'total hip arthroplasty', 'biomaterials', 'stainless steel', 'cobalt-chromium', 'titanium', 'polyethylene', and 'ceramic'. Results: The initial search retrieved 6921 articles. Thirty-two articles were selected and used in the review. Conclusion: This article introduces biomaterials used in THA and discusses various bearing materials in currentclinical use in THA as well as the newer biomaterials which may even further decrease wear and improve THA survivorship.

Effects of Reactive Air Brazing Parameters on the Interfacial Microstructure and Shear Strength of GDC-LSM/Crofer 22 APU Joints

  • Raju, Kati;Kim, Seyoung;Seong, Young-Hoon;Yoon, Dang-Hyok
    • 한국세라믹학회지
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    • 제56권4호
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    • pp.394-398
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    • 2019
  • In this paper, the joining characteristics of GDC-LSM ceramics with Crofer 22 APU metal alloys was investigated at different brazing temperatures and holding times by reactive air brazing. Brazing was performed using Ag-10 wt% CuO filler, at three different temperatures (1000, 1050, and 1100℃ for 30 minutes) as well as for three different holding times (10, 30, and 60 minutes at 1050℃). The interfacial microstructures were examined by scanning electron microscopy and the joining strengths were assessed by measuring shear strengths at room temperature. The results show that with increasing brazing temperature and holding time, joint microstructure changed obviously and shear strength was decreased. Shear strength varied from a maximum of 100±6 MPa to a minimum of 18±5 MPa, depending on the brazing conditions. These changes were attributed to an increase in the thickness of the oxide layer at the filler/metal alloy interface.

Ti-6.0wt%Al-4.0wt%V 합금 용탕의 금형 주조 (Permanent Mold Casting of Ti-6.0wt%Al-4.0wt%V Alloy Melt)

  • 강장원;김명용;이상길;이해중;김경훈;이효수;임성철;권혁천
    • 한국주조공학회지
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    • 제27권3호
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    • pp.135-139
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    • 2007
  • To produce higher quality of titanium casting at a lower cost, the new titanium casting technology by using a permanent metal mold was developed and applied to fabricate hip joint for biomedical application. The present study was carried out to investigate the reactivity and fluidity of the Ti-6.0 wt%Al-4.0 wt%V alloy with metal mold by applying various ceramic powders coating on the mold surface. The molten titanium for manufacturing hip joint was poured into steel mold. No reaction layer was formed on the surface of specimens fabricated steel mold coated with $Y_2O_3$ powder.