• Title/Summary/Keyword: 부착 특성

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Studies on the Adhesion of W to TiN(II) (TiN에 대한 W의 부착특성에 관한 연구(II))

  • Lee, Jong-Mu;Gwon, Nan-Yeong;Lee, Jong-Gil
    • Korean Journal of Materials Research
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    • v.3 no.6
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    • pp.593-597
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    • 1993
  • Adhesion of CVD W to the TiN glue layer in the blanket W process which is a promising candidate for filing contact holes in subhalfmicron ULSIs has been investigated. The adhesion was enhanced with increasing the W film thickness due to the decrease of the TiN film stress. The adhesion strength was increased by the sputter etching of the TiN surface prior to the W deposition owing to the removal of contaminants and the increase of the surface roughness. The adhesion of the W film to the TiN glue layer property was also improved by Ar ion implantation of the TiN surface owing to the activation of the TiN surface.

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RC조 보수에 사용되는 폴리머시멘트 몰탈의 철근 부착특성 평가

  • Park, Dong-Cheon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.10a
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    • pp.247-249
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    • 2013
  • 열화한 철근콘크리트 구조물에 대하여 성능회복을 위하여 전기화학적 방식, 단면복구공법, 균열보수공법, 표면마감공법 등이 상용되고 있다. 본 연구에서는 단면복구공법의 적용과 성능예측을 위한 해석 모델의 입력값으로 사용될 보강철근과 단면복구재의 부착특성을 평가하기 위하여 철근인발실험을 실시하였다. 폴리머시멘트몰탈이 사용되었으며 부착요소의 강성과 강도를 구하여 비선형 해석을 실시하여 상당한 정확도의 예측값을 도출하였다.

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Bond Behavior of Epoxy Coated Reinforced Concrete (에폭시수지 도막 철근콘크리트의 부착특성 연구)

  • 오병환;엄주용;권지훈
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.79-84
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    • 1993
  • 철근의 부식은 철근 콘크리트 구조물에 있어서 심각한 열화현상을 유발할 수 있으며 최근 들어 이로 인한 피해가 많이 보고되고 있다. 이와 같은 부식의 억제방안 중 철근에 직접 에폭시를 도막하는 것이 가장 효과적인 것으로 알려져 있다. 그러나 이 경우 에폭시 도막에 따른 부착성능의 저하가 우려되는 바 본 연구는 철근부식방지를 위해 에폭시를 도막한 철근의 부착특성을 고찰하기 위해 수행되었다. 주된 변수는 콘크리트 압축강도, 부착길이, 에폭시 도막두께이며 각 변수별로 부착특성의 변화를 관찰하였고 이를 통해 에폭시도막 철근의 사용성을 검토하였다. 본 실험결과에 기초하여 부착강도 예측식을 제안하였고 실험결과와 예측치를 비교하였다.

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Studies on the Adhesion of W to TiN(l) (TiN 에 대한 W의 부착특성에 관한 연구(l))

  • Lee, Jong-Mu;Gwon, Nan-Yeong;Son, Jae-Hyeon;Kim, Hyeong-Jun
    • Korean Journal of Materials Research
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    • v.3 no.5
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    • pp.466-475
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    • 1993
  • Adhesion of W to TiN which is used as a glue layer in the blanket tungsten process has been investigated using the pulling and scratch methods and analysed using surface roughness measurements by SEM and the reflectivity measurement, the stress measurement and the SIMS depth profiling Significant differences between the adhesion of the CVD tungsten film to the s-TiN and that to the a-TiN were found. It appeared that the fomer were better than the latter, which is due to the facts that the s-TiN film has a rougher surface and a lower stress level and a higher oxygen content than the a-TiN film. Also the ashesion strength was degreaded with increasing the TIN film thickness because of the increase of the TiN film stress.

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Experimental Study on the Bond Properties between GFRP Reinforcements and Steel Fiber Reinforced Concrete (강섬유 보강 콘크리트와 GFRP 보강근의 부착특성에 관한 실험적 연구)

  • Choi, Yun-Cheul
    • Journal of the Korea Concrete Institute
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    • v.25 no.5
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    • pp.573-581
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    • 2013
  • In this paper, an experimental investigation of bond properties between steel fiber reinforced concrete and glass fiber reinforced polymer reinforcements was performed. The experimental variables were diameter of reinforcements, volume fraction of steel fiber, cover thickness and compressive strength of concrete. Bond failure mainly occurred with splitting of concrete cover. Main factor for splitting of concrete is tension force occurred by the displacement difference between reinforcements and concrete. Therefore, in order to prevent the bond failure between reinforcements and concrete, capacity of tensile strength of concrete cover should be upgraded. As a results of test, volume fraction of steel fiber significantly increases the bond strength. Cover thickness changes the failure mode. Diameter of reinforcements also changes the failure mode. Generally, diameter of reinforcement also affects the bond properties but this effect is not significant as volume fraction of fiber. Increase of compressive strength increases the bond strength between concrete and reinforcement because compressive strength of concrete directly affects the tensile strength of concrete.

An Experimental Study on Bond Characteristics of FRP Reinforcements with Various Surface-type (다양한 표면형상에 따른 FRP 보강재의 부착특성 실험연구)

  • Jung, Woo Tai;Park, Young Hwan;Park, Jong Sup
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.4A
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    • pp.279-286
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    • 2011
  • FRP (Fiber Reinforced Polymer) tendons can be used as an alternative to solve the corrosion problem of steel tendons. Material properties of FRP tendons-bond strength, transfer length, development length-must be determined in order to apply to concrete structures. First of all, in case of application for pretension concrete members with CFRP tendons, transfer length is an important characteristic. The bond of the material characteristics should be demanded clearly to apply to PSC structures prestressed with FRP tendons. This paper investigated on the bond characteristics of FRP reinforcements with various surface-type. To determine the bond characteristics of FRP materials used in place of steel reinforcement or prestressing tendon in concrete, pull-out testing suggested by CAN/CSA S806-02 was performed. A total of 40 specimens were made of concrete cube with steel strands, deformed steel bar and 6 different surface shape FRP materials like carbon or E-glass. Results of the bonding tests presented that each specimen showed various behaviors as the bond stress-slip curve and compared with the bond characteristic of CFRP tendon developed in Korea.

Adhering Characteristics of Diesel Spray Impinging to a Flat Wall (평판에 충돌하는 디젤분무의 부착특성)

  • Ko, K.N.;Huh, J.C.
    • Journal of Power System Engineering
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    • v.9 no.3
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    • pp.21-25
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    • 2005
  • 디젤분무가 연소실 벽에 충돌할 때의 연료부착특성을 파악하기 위하여 평판에 충돌하는 디젤 분무의 부착특성을 실험적으로 연구하였다. 투명 아크릴판을 이용하여 연료액막과 충돌분무를 동시에 촬영하였고, 충돌분무의 성장에 따른 연료액막의 성장도 함께 측정되었다. 부착된 연료는 연료액막 및 부착액적들로 나누어서 측정할 수 있었으며 그 결과 연료액막 주변에 무수한 연료액적이 부착함을 알 수 있었다. 시간에 따른 부착연료비를 예측하기 위하여 몇 가지 가정이 사용되었다. 그 결과 시간경과에 따른 부착연료비를 충돌거리 10mm, 30mm, 50mm에 대하여 예측할 수 있었다.

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Bond Properties of Nonpolar Macro Synthetic Fiber in Cement Mortar with Maleic Anhydride Grafted Polypropylene Powder (무수말레인산이 그라프트된 폴리프로필렌 분말 첨가에 따른 시멘트 모르타르와 무극성 마크로 합성섬유의 부착 특성)

  • Lee, Jin-Hyung;Park, Chan-Gi
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.2A
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    • pp.137-143
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    • 2011
  • This study evaluated the effects of maleic anhydride grafted polypropylene powder (mPP) contents on the bond properties of cement mortar and nonpolar macro synthetic fibers (macro synthetic fiber). Dog-bone bond tests were performed to evaluate the bond performance of macro synthetic fiber in cement mortar with varying amounts of mPP (0%, 5%, 10%, 15%, 20%, 25%, 30% of cement weight). The bond properties (pullout behavior, pullout load and interface toughness) of macro synthetic fiber in cement mortar increased as the mPP contents was increased. The bond properties increased with the mPP contents. The microstructure of macro synthetic fiber surface was examined after the pullout test to analyze the frictional resistant force according to mPP contents during the pullout process of macro synthetic fiber in cement mortar. The scratched of macro synthetic fiber increased with the mPP contents.

Pullout Bond Characteristics of Untensioned Prestressing Strand (인장을 가하지 않은 PS강연선의 인발 부착특성)

  • Ha, Sang-Su
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.5
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    • pp.101-108
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    • 2008
  • The primary objective of this research is a study on the pullout bond characteristics of untensioned prestressing strand in concrete. The bond characteristics of untensioned prestressing strand in concrete differs from that of deformed reinforcing bar. In order to use and design untensioned prestressing strand as deformed reinforcing bar, a study for bond characteristics of the untensioned prestressing strand was progressed. Major test variables are embedment length ($10d_b{\sim}60d_b$), concrete cover (45mm, 70mm, 100m) and diameter of strands. (12.7mm : SWPC7, 9.3mm : SWPC7A) As a results, these showed that average bond stress was decreased as a growing the embedment length, and then showed that the bond performance of untensioned prestressing strand was improved if embedment length was above 60$60d_b$.