• Title, Summary, Keyword: Adhesion strength

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A study on adhesion strength of electroless plated deposits on Alumina substrate (Alumina substrate 상의 무전해 도금층의 밀착력에 관한 연구)

  • 조용균;안균영;박용수
    • Journal of the Korean institute of surface engineering
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    • v.24 no.4
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    • pp.187-195
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    • 1991
  • Adhesion strength of electroless-plated Ni, Ni-P and Cu deposites on alumina substrate has been studied. Grain boundary spaces produced on the substrate surface by etching treatment provided anchoring sites for enhancing the adhesion strength. Adhesion strengths of Ni-P and Ni deposit were higher than that of Cu deposit, because of higher initial nucleation rates than the latter. The electroless-plated Ni-P and Ni underlayer improved the adhesion strength of the Cu deposit. In could be attributed to the enhanced adhesion between the substrate and those underlayers as well as the satisfactory adhesion between Cu deposits and those underlayers. Heat treatment was also conducted in order to enhance the adhesion strength of Cu layer. The strength was enhanced by about 19% when the treatment was conducted at $150^{\circ}C$ for 2 hours. The enhancement was attributed to relief of internal stress and release of hydrogen.

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Influence of Parameters on Adhesion Strength on TiN Film by using R.F. Plasma Assisted Chemical Vapor Deposition (PACVD로 증착된 TiN 박막의 밀착성에 관하여)

  • Shin, Y.S.;Kim, M.I.
    • Journal of the Korean Society for Heat Treatment
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    • v.3 no.1
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    • pp.17-24
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    • 1990
  • In this study, TiN film was deposited onto steel by R.F.-PACVD in order to investigate the influence of parameters on the adhesion strength between film and substrate. Experimental results showed that adhesion strength by SAT is different from by optical microscopy. Adhesion strength is increased when the deposition temperature increases and is influenced by R.F. power and electrode distance. Especially heat treatment on the substrate has influenced over the adhesion strength, so it showed the 22 Newtons in adhesion strength by SAT and adhesion strength is decreased when deposition thickeness is thick and hardness is high. Also if the film is thick and high hardness simultaneous, the film was delaminated seriously.

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Hardness and adhesion of the reactively sputtered Zr-ZrN on the stainless steel(SUS304) and tool steel(SKH9) (스테인레스와 공구강 위에 스퍼터링된 Zr-ZrN 코팅층의 경도 및 밀착성에 대한 연구)

  • 예길촌;신현준;권식철;백원승
    • Journal of the Korean institute of surface engineering
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    • v.26 no.6
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    • pp.316-326
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    • 1993
  • Adhesion and hardeness are the most important properties of a hard coated layer which is applied to wear-resistant devices. Zr/ZrN layer was deposited on tool steel(SKH9) and stainless steel(SUS304) by a re-active D.C. magnetron sputtering technique and their microhardness and adhesion strength were measured for the films processed by changing the partial pressures of $N_2$ gas (4~10$\times$$10^{-4}$mbar) and the substrate bias voltage(0~250V). The adhesion strength was evaluated by acoustic signals through the scratch-test with the incremental applied load. As the partial pressure of $N_2$ gas and the substrate bias voltage were increased, the adhesion strength of tool steel was observed to be stronger than that of the stainless steel. The adhesion strength was generally, observed to decrease with the same tendency regardless of the kinds of substrates. The adhesion strength of tool steel was increased more and more strongly than that of stainless steel as heat-treated temperature was increased. The strength of tool steel was appeared to be high adhesion strength at $400^{\circ}C$. From the failure mode of the film during the scratch adhesion test, the cohesive failure was observed to be obvious and the adhesive failure in a minor portion in the Zr/ZrN doublelayer regardless of the kinds of substrates.

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A Research on Suggestion of Proper Adhesion Strength about conjugation Method of outside Insulation. (외단열 고정 방법에 따른 적정 접착강도 제안에 관한 연구)

  • Park, Wan-Goo;An, Ki-Won;Park, Jin-Samg;Park, Ku-Byoung;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.93-94
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    • 2012
  • Recently outside insulation is applied on the building. Adhesion mortar and anchor are used fixing method of outside insulation. However, a research on proper Adhesion Strength is not performed. So outside insulation exfoliate from building in rainy with winds. Therefore, this research suggest proper adhesion strength about conjugation method of outside insulation. As a result, adhesion way using the adhesive mortar + anchor is best. And proper adhesion strength is over 1,065 N.

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Characteristics Correlations Between Fiber-Reinforced and Interfacial Adhesion in Carbon fiber reinforced Cement composite Prepared by Slurry Method. (슬러리법에 의한 탄소섬유보강 시멘트복합체의 제조에서 보강섬유와 계면결착제와의 상관특성)

  • Choi, Eung-Kyoo
    • Journal of the Korea Institute of Building Construction
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    • v.2 no.3
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    • pp.131-138
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    • 2002
  • The objective of the study is to examine the characteristic correlations between reinforcing carbon fiber and interfacial adhesion agent since the interfacial adhesion strength between reinforcing carbon fiber and matrices is believed to be an essential element influencing the physical properties in carbon fiber reinforced cement composite using slurry method. The integrity of interfacial adhesion between reinforcing fiber and cement not only affects the quality of fiber reinforced cement composite but also influences to a large degree the physical properties of the cement composite when producing carbon fiber reinforced cement composite using slurry method. Having analyzed the physical properties 1.e., water content, tensile strength, flexural strength and flexural toughness of carbon fiber reinforced cement composite specimens, C-PAM(cation polyacrylamide) was determined to be an optimum interfacial adhesion agent. The study has also demonstrated that interfacial adhesion strength varies largely on the content and type of the reinforcing fiber. Judging from magnified view of the tensile shear cross-section using VMS(video microscope system), interfacial adhesion strength between reinforcing fiber and matrices is affected by the type of interfacial adhesion agent. According to the result of the experiments, C-PAM was determined to be an ideal interfacial adhesion agent when using carbon fiber in producing carbon fiber reinforced cement composite with the optimum content of carbon fiber being established.

Evaluation of the Adhesion Strength of Metal Spray Coating System in Steel using High-frequency Arc Metal Spray Method (고주파 아크 금속용사기를 이용한 금속용사 코팅계의 부착강도 평가)

  • Choe, Hong-Bok;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.96-97
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    • 2014
  • The purpose of this study is to analyze the adhesion strength of metal spray coating system in steel using high-frequency arc metal spray method. For the purpose the experimental factor such as surface roughness was selected at 3 levels. As a result of experiment, it appeared that high-frequency arc metal spray method had higher adhesion strength than existing metal spray method. Especially, Al-Mg showed the highest adhesion strength than other metals. In case of surface roughness, the higher roughness steel has, the higher adhesion strength appeared.

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ADHESION STRENGTH OF DIAMOND COATED WC-Co TOOLS USING MICROWAVE PLASMA CVD

  • Kiyama, Nobumichi;Sakamoto, Yukihiro;Takaya, Matsufumi
    • Journal of the Korean institute of surface engineering
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    • v.29 no.5
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    • pp.540-544
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    • 1996
  • To apply the CVD diamond film to coated tools, it is necessary to make adhesion strength between diamond film and substrate stronger. So adhesion strength of diamond coated WC-Co tools using Microwave Plasma CVD and cutting test of Al-18mass%Si alloy using diamond cutting tools were studied. Diamond coating was carried out using Microwave Plasma CVD apparatus. Reaction gas was used mixture of methane and hydrogen. Substrate temperature were varied from 673K to 1173K by control of microwave output power and reaction pressure. By observation of SEM, grain size became larger and larger as substrate temperature became higher and higher. Also all deposits were covered with clear diamond crystals. XRD results, the deposits were identified to cubic diamond. An analysis using Raman spectroscopy, the deposit synthesized at lower substrate temperature (673K) showed higher quality than deposit synthesized at higher substrate temperature (1173K). As a result of scratch adhesion strength test, from 873K to 1173K adhesion strength decreased by rising of substrate temperature. The deposit synthesized at 873K showed best adhesion strength. In the cutting test of Al-18mass%Si alloy using diamond coated tools and the surface machinability of Al-Si works turned with diamond coating tools which synthesized at 873K presented uniform roughness. Cutting performance of Al-18mass%Si alloys using diamond coated WC-Co tools related to the adhesion strength.

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Adhesion and Electrical Performance by Roughness on Semiconductive-Insulation Interface Layer of Silicone Rubber (거칠기에 따른 반도전-절연 계면층에서 접착특성과 절연성능)

  • Lee, Ki-Taek;Hwang, Sun-Mook;Hong, Joo-Il;Huh, Chang-Su
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.78-81
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    • 2004
  • In this paper, the effect of adhesion properties of semiconductive-insulating interface layer of silicone rubber on electrical properties was investigated. Surface structure and adhesion of semiconductive silicon rubber by surface asperity was obtained from SEM and T-peel test. In addition, ac breakdown test was carried out for elucidating the change of electrical property by roughness treatment. From the results, Adhesive strength of semiconductive-insulation interface was increased with surface asperity. Dielectric breakdown strength by surface asperity decreased than initial Specimen, but increased from Sand Paper #1200. According to the adhesional strength data unevenness and void formed on the silicone rubber interface expand the surface area and result in improvement of adhesion. Before treatment Sand Paper #1200, dielectric breakdown strength was decreased by unevenness and void which are causing to have electric field mitigation small. After the treatment, the effect of adhesion increased dielectric breakdown strength. It is found that ac dielectric breakdown strength was increased with improving the adhesion between the semiconductive and insulating interface.

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Estimation of Interfacial Adhesion through the Micromechanical Analysis of Failure Mechanisms in DLC Film

  • Jeong, Jeung-Hyun;Park, Hae-Seok;Ahn, Jeong-Hoon;Dongil Kwon
    • The Korean Journal of Ceramics
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    • v.3 no.2
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    • pp.73-81
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    • 1997
  • In this paper, it is intended to present more reproducible and quantitative method for adhesion assemssement. In scratch test, micromechanical analysis on the stress state beneath the indenter was carried out considering the additional blister field. The interface adhesion was quantified as work of adhesion through Griffith energy approach on the basis of the analyzed stress state. The work of adhesion for DLC film/WC-Co substrate calculated through the proposed analysis shows the identical value regardless of distinctly different critical loads measured with the change of film thickness and scratching speed. On the other hand, uniaxial loading was imposed on DCL film/Al substrate, developing the transverse film cracks perpendicular to loading direction. Since this film cracking behavior depends on the relative magnitude of adhesion strength to film fracture strength, the quantification of adhesion strength was given a trial through the micromechanical analysis of adhesion-dependence of film cracking patterns. The interface shear strength can be quantified from the measurement of strain $\varepsilon$s and crack spacing $\lambda$ at the cessation of film cracking.

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Effect of Surface Modification of Polyester Cord on the Adhesion of SBR/Polyester (폴리에스터 코드의 표면개질 조건이 SBR/폴리에스터의 접착에 미치는 영향)

  • Park, Y.S.;Chung, K.H.
    • Elastomers and Composites
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    • v.42 no.2
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    • pp.75-85
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    • 2007
  • In this study, the new adhesion system was studied to improve the adhesion strength between polyester cord and rubber matrix. In order to enhance the adhesion strength through polyester cord's surface treatment, the NaOH solution was used. The NaOH solution concentrations of 0.03, 0.05, 0.1, 0.2, 0.5, 1 and 5 wt.% were used in surface modifying the polyester cord. The optimum condition showing the maximum adhesion strength of polyester cord with SBR compound containing bonding agent was at NaOH concentration of 0.05 wt.% with treatment time of 10 minutes. When the NaOH solution concentration was above 1 wt.%, the polyester cord due to the excess surface modification was damaged, and resulted in breakage during the adhesion test. Also, the adhesion strength between polyester and SBR could be improved by coating the polyester cord with triallylcyanurate(TC) adhesive. The drying condition of polyester cord coated with TC attributed to the adhesion strength. The maximum adhesion strength was obtained by using the polyester cord dried at $220^{\circ}C$ rather than dried at room temperature.