• 제목/요약/키워드: Cold-bonding

검색결과 94건 처리시간 0.023초

Cu-Al 판재의 냉간 및 온간 압접에서 낮은 접합강도를 갖는 공정 조건에 관한 연구 (Process Conditions for Low Bonding Strength in Pressure Welding of Cu-Al Plates at Cold and Warm Temperatures)

  • 심경섭;이용신
    • 소성∙가공
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    • 제13권7호
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    • pp.623-628
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    • 2004
  • This paper is concerned with pressure welding, which has been known as a main bonding mechanism during the cold and warm forming such as clad extrusion or bundle extrusion/drawing. Bonding characteristics between the Cu and Al plates by pressure welding are investigated focusing on the weak bonding. Experiments are performed at the cold and warm temperatures ranging from the room temperature to $200^{\circ}C$. The important factors examined in this work are the welding pressure, pressure holding time, surface roughness, and temperature. A bonding map, which can identify the bonding criterion with a weak bonding strength of IMPa , is proposed in terms of welding pressure and surface roughness fur the cold and warm temperature ranges.

(Ag-10 % Ni)/Cu 접점재의 냉간압연접합 (Cold Roll Bonding of (Ag-10% Ni)/Cu Clad Metals)

  • 김종헌;김성일;박상용
    • 소성∙가공
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    • 제6권2호
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    • pp.136-144
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    • 1997
  • (Ag-10%Ni)/Cu clad metals for electric contact switch were fabricated by cold-roll bonding process. 2 or 3 passes of cold-rolling was carried out for each process to investigate the effect of the rolling passes on the bonding property. The effect of the annealing temperature of copper before the cold-roll bonding on the bond strength was also studied. The specimen bonded with copper annealed below 30$0^{\circ}C$ before roll bonding showed good bond strength. This is because high stored energy in copper promoted the short range diffusion and the grain refinement of copper by the static recrystallization increased the degree of the interfacial coherency. The maximum peel strength of clad metals bonded with Cu annealed below 30$0^{\circ}C$ was 120N.

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엡셋팅에 의한 냉간 압접의 결합 기구와 결합강도 (The bonding mechanism and bond strength of cold pressure welding)

  • 한인철;김재도
    • Journal of Welding and Joining
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    • 제8권3호
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    • pp.31-38
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    • 1990
  • The bonding mechanism and bond strength were investigated for the cold pressure welding of Al to Al, Cu to Cu and Al to Cu by upsetting. A phenomenon of bonding betweenthe metallic components has been observed by a scanning electron microscope and metallurgical microscope. A modified equation for bond strength with respect to the reduction of height shows reasonably a good agreement with the experimental data. When the values of the hardening factor and threshold deformation for the given materials could be determined, the theoretical bond strength can be calculated.

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냉간 및 온간에서의 구리와 알루미늄 압접에 관한 실험적 연구 (Experimental Study on Pressure Welding of Cu and Al at Cold and Warm Temperatures)

  • 심경섭;김용일;장성동;김원술;이용신
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2003년도 추계학술대회논문집
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    • pp.225-228
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    • 2003
  • This paper is concerned with pressure welding, which has been known as a main bonding mechanism for the cold and warm clad forming. Bonding characteristics of pressure welding between the copper and aluminum plates are experimentally investigated. Experiments are performed at the cold and warm temperature range with the variation of important factors such as magnitude of pressure, surface roughness of Cu and Al plates, and pressure holding time. It could be concluded that the bonding criterion might be given as a function of bonding pressure and surface roughness for the cold and warm temperature ranges.

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대기압 Ar/O2 플라즈마 표면처리된 자동차용 냉연강판의 표면특성 및 접착특성평가 (The Evaluation of Surface and Adhesive Bonding Properties for Cold Rolled Steel Sheet for Automotive Treated by Ar/O2 Atmospheric Pressure Plasma)

  • 이찬주;이상곤;박근환;김병민
    • 대한기계학회논문집A
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    • 제32권4호
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    • pp.354-361
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    • 2008
  • Cold rolled steel sheet for automotive was treated by Ar/$O_2$ atmospheric pressure plasma to improve the adhesive bonding strength. Through the contact angle test and calculation of surface free energy for cold rolled steel sheet, the changes of surface properties were investigated before and after plasma treatment. The contact angle was decreased and surface free energy was increased after plasma treatment. And the change of surface roughness and morphology were observed by AFM(Atomic Force Microscope). The surface roughness of steel sheet was slightly changed. Based on Taguchi method, single lap shear test was performed to investigate the effect of experimental parameter such as plasma power, treatment time and flow rate of $O_2$ gas. Results shows that the bonding strength of steel sheet treated in Ar/$O_2$ atmospheric pressure plasma was improved about 20% compared with untreated sheet.

Nondestructive Evaluation of Temporarily Repaired CFRP Laminates Subjected to Delaminations due to Localized Heating and Cyclic Loading Combined

  • Han, Tae-Young;Kwon, Oh-Yang
    • 비파괴검사학회지
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    • 제27권3호
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    • pp.268-279
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    • 2007
  • The reliability of cold-bonding repair technique of carbon-fiber reinforced plastics (CFRP) laminates, often used as a temporary repair for the airplane maintenance, has been evaluated during cyclic loading and localized heating by nondestructive methods. Major concern was given to the evolution of damage after repair in the form of delaminations due to localized heating and cyclic loading combined. An area of interest both on the specimen repaired by cold-bonding and the specimen without repair where delaminations were induced by localized heating and cyclic loading was monitored by acoustic emission (AE) testing and further examined by pitch-catch low-frequency bond testing, and pulse-echo high-frequency ultrasonic testing. The results showed that the reliability of cold-bonding repair would be significantly reduced by the localized heating and cyclic loading combined rather than by the cyclic loading only. AE monitoring appeared to be an effective and reliable tool to monitor the integrity of temporarily repaired CFRP laminates in terms of the structural health monitoring (SHM) philosophy.

콜드조인트 지연시간에 따른 초고성능 콘크리트의 부착성능평가에 관한 실험적 연구 (An Experimental Study on Bonding Performance Evaluation of UHPC in Accordance with Delay Time of Cold Joints)

  • 장현오;김보석;장종민;이한승
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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    • pp.22-23
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    • 2016
  • This study aims to derive the optimal condition that ensures the monolithicity of ultra-high performance concrete (UHPC), through the evaluation of bonding shear performance with respect to the time of cold joint occurrence during the placement. From the direct shear test, while the normalized bonding shear strength reduction of UHPC with the delay time of 15 minutes was the lowest at around 8%, a dramatic degradation of bonding shear performance was observed after 15 minutes. XRD analysis of the middle and surface sections was performed in order to analyze the composition of the thin film formed at the surface of UHPC, and as a result, the main ingredient appeared to be SiO2 from the XRD pattern of middle and surface sections, which is believed to be the result of the rising of SiO2-based filler, used as anadmixture in this study, toward the surface, due to its low specific gravity.

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지속적 가압 주사식 열중합 의치상 레진에 대한 열중합, 자가중합 및 광중합 레진의 결합력에 관한 비교분석 (COMPARATIVE TENSILE BOND STRENGTH OF HEAT-CURED, COLD-CURED, AND LIGHT CURED DENTURE BASE RESINS BONDED TO CONTINUOUS-PRESSURE INJECTION TYPE DENTURE BASE RESIN)

  • 황승우;정문규
    • 대한치과보철학회지
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    • 제31권3호
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    • pp.385-393
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    • 1993
  • Injection processing of denture base resin was introduced by Pryer in 1942, in an attempt to reduce processing shrinkage. More recently a continuous-pressure injection type technique has been developed (SR-Ivocap, Ivoclar AG, Schaan, Liechtenstein.), and it reduced processing error and increased resin density. The purpose of this study was to compare tensile bond strength of heat-cured, cold-cured, and light-cured denture base resin bonded to continuous-pressure injection type resin. To know it, 60 cylindrical resin specimens were fabricated, and tensile bond strength were measured. The results were as follows : 1. The mean tensile bond strength bonded to continuous-pressure injection type resin was lower than bonded to conventional heat cured resin. But tensile bond strength of conventional heat cured resin bonding with light cured resin was lower than continuous-pressure injection type resin. 2. Of the tensile bond strength bonded to continuous-pressure injection type resin, tensile bond strength bonding with continuous-pressure injection type resin was the greatest(but not significantly different from bonding with conventional heat cured resin), followed by cold-cured, light-cured resin. 3. Of the tensile bond strength bonded to conventional heat cured resin, tensile bond strength bonding with conventional heat cured resin was the greatest and followed by continuous-pressure injection type resin, cold-cured resin, light-cured resin. According to these results, bonding of continuous-pressure injection type resin with conventional heat cured resin or continuous-pressure injection type resin is acceptable, but bonding with light-cured resin is questionable.

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Present Status and Future Prospects of Cold Spraying

  • Gaertner, Frank;Schmidt, Tobias;Kreye, Heinrich
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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    • pp.236-237
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    • 2006
  • Cold spraying is a fairly new coating technique, which within the last decade attracted serious attention of research groups and spray companies. As compared to thermal spraying, the low process temperatures in cold spraying result in unique coating properties, which promise new applications. Since particles impact with high kinetic energy in the solid state, new concepts to describe coating formation are requested to enable the full potential of this new technology. The present contribution gives a brief review of current models concerning bonding, supplying a description of the most influential spray parameters and consequences for new developments. With respect to spray forming by cold cold spraying, microstructures and thick, further machineable structures are presented.

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FEA를 이용한 Cold Cathode Lamp의 제작 공정 연구와 그 응용성 (The Application and Fabrication Process of Cold Cathode Lamp Using a FEA)

  • 박성현;홍근조;전석환;권상직;이능헌;박재범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 C
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    • pp.1800-1802
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    • 2000
  • 본 연구에서는 냉음극 발광 소자인 FEA를 이용하여 Cold Cathode Lamp 제작과 그 구조에 대해서 연구하였다. Anode plate에는 ZnO:Zn 형광체를 전기영동법으로 증착한 후 tube slabs와 anode plate를 frit glass를 이용하여 접합하였다. FEA와 substrate의 bonding, addressing을 위한 wire bonding, substrate와 집속전극, setter를 stem base의 외부전극에 연결하기 위한 spot welding, tube와 stem base를 glass melting method로 접합 공정을 하였다. 진공배기 시스템에 배기판을 연결하여 ${\sim}10^{-7}$torr까지 배기한 후 heater를 이용하여 배기관을 tip-off하였다. 최종적으로 진공을 유지하기 위해 getter를 RF 고주파로 활성화하였다. 결론적으로 lamp외 특성을 비교분석한 후 휘도 및 발광효율을 향상시키기 위한 구조절 개선과 방안을 고찰하였다.

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