• Title/Summary/Keyword: bonding properties

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An Experimental Study on the Influence of Bonding Material Content Affecting on the Engineering Properties of High Strength Flowing Concrete (Part 1 experimental program and properties of fresh concrete) (고강도유동화 콘크리트의 공학적 특성에 미치는 단위결합재량의 영향에 관한 실험적 연구 (제 1보 실험계획 및 아직 굳지 않은 콘크리트의 물성))

  • 김진만;남상일;최진성;김규용;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.29-34
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    • 1993
  • Although bonding material content of the high strength flowing concrete is very important in engineering properties, in rich mix concrete increasing the bonding material content may not follow more good properties. This study is to investigate the influence of the bonding material content affecting on the engineering properties of high strength flowing concrete, and this paper is to analyze the properties of fresh concrete. The results reveal that concrete of less bonding material content has about the same good consistency as concrete of more bonding material content, and that the evaluation methods of workability have to change in high strength flowing concrete.

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An Experimental Study on the Influence of Bonding Material Content Affecting on the Engineering Properties of High Strength Flowing Concrete (Part II) properties of hardened concrete (고강도유동화 콘크리트의 공학적특성에 미치는 단위결합재량의 영향에 관한 실험적 연구 (제 2보 경화콘크리트의 공학적 특성))

  • 김진만;이상수;최진성;박정일;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.35-38
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    • 1993
  • Although bonding material content of the high strength flowing concrete is very important in engineering properties, in rich mix concrete increasing the bonding material content may not follow more good properties. This study is to investigate the influence of the bonding material content affecting on the engineering properties of high strength flowing concrete, and this paper is to analyze the properties of hardened concrete. The results reveal that the strength of concrete having loss bonding material content is higher than that of concrete having more bonding material content, and that in proportion to increasing of concrete strength brittleness factors decrease, and that the static modulus of elasticity in this study is less than that in specification.

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Studies on Bond Properties of Repair Materials (보수.보강재료의 부착 특성에 관한연구)

  • 김진선;김경원;한만엽;정영수;홍영균
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.10a
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    • pp.293-298
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    • 1995
  • This study experimentally evaluate the bonding performance of repair and strengthening materials. It is very important problem to justify bonding properties between repair and strengthening materials and old concrete. Many previous research and investigation showed that bonding strength of reinforcing materials determines the strengthening effect and the durability of repair work. Therefore, menifestation of bonding properties and the improvement of bonding performance of repair and strengthening materials are very important. In order to improve the perforamnce of repair work, it needs to investigate the behavior of bonding materials, such as stress distribution along the bonding area and the long term performance of the material. The target repair methods are steel plate addition technique and repair mortar method, and the test parameters studied in this paper include epoxy thickness, bonding surface texture, and bonding area.

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Deformation Properties of Gold Bonding Wire for VLSI Packaging Applications (반도체 패키징용 Gold Bonding Wire의 변형특성 및 해석)

  • Kim K.;Hong S. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2001.05a
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    • pp.250-253
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    • 2001
  • Mechanical properties of gold bonding wire for VLSI packaging have been studied. The diameters of gold wires are about 20-30 micrometer and fracture loads are 8-20 gram force. The elastic modulus, yield strength, fracture strength and elongation properties have been evaluated by micro-tensile test method. This work discusses for an appropriate selection of micro-force testing system and grip design in mim testing. The best method to determine gauge length of wire and to measure tensile properties has been proposed. The mechanical properties such as strength and elastic modulus of current gold bonding wire are higher than pure those of gold wire.

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Bonding Mechanism and Strength of Metals to Ceramics (금속과 세라믹의 접합기구와 접합강도)

  • Kee, Se-Ho;Jung, Jae-Pil;Kim, Won-Joong
    • Journal of Welding and Joining
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    • v.32 no.1
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    • pp.40-46
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    • 2014
  • Bonding technology and bonding mechanism of metal to ceramic including brazing, diffusion bonding, friction welding and etc were reviewed in this study. Various factors should be considered from a bonding design step to acquire a good bonding joint because of a large difference between metal and ceramic in crystal lattice, coefficient of thermal expansion and various properties. In addition, metal and ceramic bonding technologies are constantly being developed according to precise components, multi-function and application to harsh environment. However, improvement of bonding properties and bonding reliability also should be accompanied. Bonding of ceramics, such as $ZrO_2$, $Ti_3AlC_2$ and SiC, to metals like Ti-alloy, TiAl and steel were described in this paper.

Effect of Bonding Condition on High Temperature Mechanical Properties of TLP Bonded Joints of FE-35Ni-26Cr Alloy (Fe-35Ni-26Cr 주강 액상확산접합부의 고온기계적 특성에 미치는 접합조건의 영향)

  • 김대업
    • Journal of Welding and Joining
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    • v.18 no.4
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    • pp.96-103
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    • 2000
  • This study investigated the effects of bonding temperature and bonding atmosphere on high temperature mechanical properties of transient liquid phase(TLP) bonded joints of heat resistant alloy using MBF-50 insert metal. Specimens were bonded at 1,423~1,468K for 600s. Microconstituents of {TEX}$Cr_{7}(C,B)_{3}${/TEX}were formed in the bonded region when the bonding temperature was low. The amount of microcostituents in the bonded layer decreased with increasing the bonding temperature, and the microconstituents in the bonded layer disappeared at the bonding temperature above 1,468K. The tensile strength of the joints at elevated temperatures increased with the increase the bonding temperature and was the same level as one of the base metal in the bonding temperature over 1,453K. Microstructure and alloying element distributions of the bonded region bonded in Ar and $N_2$atmosphere were similar to those of the bonded in vacuum. The creep rupture strength and rupture lives of joints were almost identical to those of base metal.

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Interfacial and Mechanical Properties of Sn-57Bi-1Ag Solder Joint with Various Conditions of a Laser Bonding Process (다양한 레이저 접합 공정 조건에 따른 Sn-57Bi-1Ag 솔더 접합부의 계면 및 기계적 특성)

  • Ahn, Byeongjin;Cheon, Gyeong-Yeong;Kim, Jahyeon;Kim, Jungsoo;Kim, Min-Su;Yoo, Sehoon;Park, Young-Bae;Ko, Yong-Ho
    • Journal of the Microelectronics and Packaging Society
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    • v.28 no.2
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    • pp.65-70
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    • 2021
  • In this study, interfacial properties and mechanical properties of joints were reported after Cu pads finished with organic solderability preservative (OSP) on flame retardant-4 (FR-4) printed circuit board (PCB) and electronic components were joined with a Sn-57Bi-1Ag solder paste by using a laser bonding process. The laser bonding process was performed under various bonding conditions with changing a laser power and a bonding time and effects of bonding conditions on interfacial and mechanical properties of joints were analyzed. In order to apply for industry, properties of bonding joints using a reflow bonding process which are widely used were compared. When the laser bonding process were performed, we observed that Cu6Sn5 intermetallic compounds (IMCs) were fully formed at the interface although the bonding times were very short about 2 and 3 s. Furthermore, void formations of the joints by using the laser bonding process were suppressed at the joints with comparing to the reflow bonding process and shear strengths of bonding joints were higher than that by using the reflow bonding process. Therefore, in spite of a very short bonding time, it is expected that joints will be stably formed and have a high mechanical strength by using the laser bonding process.

The Effect of Bonding Condition on Tensile Properties of Diffusion Bonds of Graphite Cast Iron FCD60 to Cr-Mo Steel SCM440 (구상흑연주철 FCD60과 Cr-Mo강 SCM440 확산접합부의 인장성질에 미치는 접합조건의 영향)

  • 송우현;김정길;강정윤
    • Journal of Welding and Joining
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    • v.22 no.1
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    • pp.77-82
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    • 2004
  • The effect of bonding condition on tensile properties of joints diffusion bonded spheroidal graphite cast iron, FCD60 to Cr-Mo steel, SCM 440 was investigated. Diffusion bonding was performed with various temperatures, holding times, pressures and atmospheres. All tensile specimens were fractured at the bonding interface. The tensile strength and elongation was increased with increasing bonding temperature. Especially, tensile strength of joints bonded at 1123K was higher than that of a raw material, FCD60, and tensile strength of joints bonded at 1173K was equal to that of a raw material, SCM440, but elongation of all joints was lower than those of raw materials. There was little the effect of holding time on the tensile properties. In comparison with bonding atmosphere, the difference of tensile strength was not observed, but elongation of joint bonded at vacuum(6.7mPa and 67mPa) was higher than that of Ar gas. Higher the degee of vacuum, elongation increased. Tensile properties of diffusion bonds depended on microstructures of cast iron at the interface and void ratio. Microstructures of cast iron at interface changed with temperature, because decarburizing and interdiffusion at the interface occurs and transformation of austenite-1 ferrite + graphite occurs on the cooling process. The void ratio decreased with increasing temperature, especially, effected on the elongation.

Degradation of Soft Magnetic Properties of Fe-Hf-N/Cr/SiO2 Thin Films Reacted with Bonding Glass (접합유리와 반응된 Fe-Hf-N/Cr/SiO2 박막의 연자기 특성 열화)

  • Je Hae-June;Kim Byung-Kook
    • Korean Journal of Materials Research
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    • v.14 no.11
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    • pp.780-785
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    • 2004
  • The degradation mechanism of soft magnetic properties of $Fe-Hf-N/Cr/SiO_2$ thin films reacted with a bonding glass was investigated. When $Fe-Hf-N/Cr/SiO_2$ films were annealed under $600^{\circ}C$ without the bonding glass, the compositions and the soft magnetic properties of Fe-Hf-N layers were not changed. However, after reaction with the bonding glass at $550^{\circ}C$, the soft magnetic properties of the film were degraded. At $600^{\circ}C$, the saturation magnetization of the reacted film decreased to 13.5 kG, and its coercivity increased to 4 Oe, and its effective permeability decreased to 700. It was founded that O diffused from the glass into the Fe-Hf-N layers during the reaction and generated $HfO_2$ phases. It was considered that the soft magnetic properties of the $Fe-Hf-N/Cr/SiO_2$ films reacted with the bonding glass were primarily degraded by the formation of the Fe-Hf-O-N layer of which the Fe content was below 60 $at\%$, and secondarily degraded by the Fe-Hf-O-N layer above 70 $at\%$.

Preparation of Thermal Bonding Fabric by using-low-melting-point Bicomponent Filament Yarn - Head tie - (저융점 복합사를 이용한 열융착 직물의 제조(I) - 헤드타이를 중심으로 -)

  • Ji, Myeong-Kyo;Lee, Shin-Hee
    • Fashion & Textile Research Journal
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    • v.11 no.3
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    • pp.474-480
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    • 2009
  • The purpose of this study is to prepare the hardness of polyester(PET) fabric by thermal bonding with low melting component of bicomponent fiber and to describe the change of physical properties of thermal bonded PET fabrics. The PET fabrics were prepared with regular PET fiber as warp and bicomponent fiber as weft. The bicomponent fiber of sheath-core type were composed with a regular PET core and low melting PET sheath. The thermal bonding of PET fabric was carried out in pin tenter from 120 to $195^{\circ}C$ temperature range for 60 seconds. In this study, we investigated the physical properties and melting behavior of PET fiber and the effect of the temperature of the pin tenter on the thermal bonding, mechanical properties. Melting peak of warp showed the thermal behavior of general PET fiber. However, melting peak of weft fiber(bicomponent fiber) showed the double melting peak. The thermal bonding of the PET fabric formed at about temperature of lower melting peak. The optimum thermal bonding conditions for PET fabrics was applied at $190{\sim}195^{\circ}C$ for 60seconds by pin tenter. On the other hand, the tensile strength of the PET fabric decreased with an increasing temperature of thermal bonding.