• 제목/요약/키워드: adhesive power

검색결과 149건 처리시간 0.031초

Experimental investigation of novel pre-tightened teeth connection technique for composite tube

  • Li, Fei;Zhao, Qilin;Chen, Haosen;Xu, Longxing
    • Steel and Composite Structures
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    • 제23권2호
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    • pp.161-172
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    • 2017
  • A new composite tube connection method called the pre-tightened teeth connection technique is proposed to improve the composite tube connection efficiency. This paper first introduces the manufacturing process of the proposed technique. It then outlines how the mechanical properties of this technology were tested using four test groups. The factors that influence the load-bearing capacity and damage model of the connection were analyzed, and finally, the transfer load mechanism was investigated. The following conclusions can be obtained from the research results. (1) The new technique improves the compressive connection efficiency by a maximum of 79%, with the efficiency exceeding that of adhesive connections of the same thickness. (2) Changing the depth of teeth results in two types of damage: local compressive damage and shear damage. The bearing capacity can be improved by increasing the depth, length, and number of teeth as well as the pre-tightening force. (3) The capacity of the technique to transfer high loads is a result of both the relatively high interlaminar shear strength of the pultruded composite and the interlaminar shear strength increase provided by the pre-tightening force. The proposed technique shows favorable mechanical properties, and therefore, it can be extensively applied in the engineering field.

MgO 증착 변수에 따른 AC-PDP의 수명 특성 연구 (A Study on the Lifetime Characteristics of AC-PDP as a Parameter of MgO Preparation)

  • 최민석;김영락;최윤창;박차수;김동현;이호준;박정후
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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    • pp.1631-1635
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    • 2002
  • In order to be good display, the ac PDP lifetime should be guaranteed over 30000 hours. Therefore, to satisfy these demands, it is need to find out main factors in ac PDP affecting the lifetime. In this paper, the characteristics of lifetime as a parameter of the MgO deposition rate conditions is investigated. MgO protective layers is fabricated by E-beam. Before measuring the lifetime we have carefully peformed high temperature evacuation and aging procedure, which is essential for providing the initial condition of our experiment. If MgO deposition rate increased, MgO film becomes dense and an adhesive power of MgO film gets better and because occurrence rate of the MgO cluster decreases, lifetime of MgO will be improved. As a result, ac PDP lifetime can be improved due to the improvement of MgO by MgO preparation conditions.

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적외선 램프 및 핫 플레이트 온도 제어를 통한 4 Bus Bar 결정질 실리콘 태양전지 솔더링 특성에 관한 연구 (A Study on the Soldering Characteristic of 4 Bus Bar Crystalline Silicon Solar Cell on Infrared Lamp and Hot Plate Temperature Control)

  • 이정진;손형진;김성현
    • Current Photovoltaic Research
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    • 제5권3호
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    • pp.83-88
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    • 2017
  • The growth of intermetallic compounds is an important factor in the reliability of solar cells. Especially, the temperature change in the soldering process greatly affects the thickness of the intermetallic compound layer. In this study, we investigated the intermetallic compound growth by Sn-diffusion in solder joints of solar cells. The thickness of the intermetallic compound layer was analyzed by IR lamp power and hot plate temperature control, and the correlation between the intermetallic compound layer and the adhesive strength was confirmed by a $90^{\circ}$ peel test. In order to investigate the growth of the intermetallic compound layer during isothermal aging, the growth of the intermetallic compound layer was analyzed at $85^{\circ}C$ and 85% for 500 h. In addition, the activation energy of Sn was calculated. The diffusion coefficient of the intermetallic compound layer was simulated and compared with experimental results to predict the long-term reliability.

Nd:YAG 레이저로 표면처리된 ITO를 전극으로 한 유기EL 소자의 특성 (Surface treatment of ITO with Nd:YAG laser and OLED device characteristic)

  • 노임준;신백균;김형권;김용운;임응춘;박강식;정무영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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    • pp.1359-1360
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    • 2006
  • lTO(Indium-Tin-Oxide) was used as anode material for OLED. Characteristics of ITO have great effect on efficiency of OLEDS(Organic light emitting diodes). ITO surface was treated by Nd:YAG laser in order to improve its chemical properties, wettability, adhesive property and to remove the surface contaminants while maintaining its original function. In this study, main purpose was to improve the efficiency of OLEDs by the ITO surface treatment: ITO surface was treated using a Nd:YAG(${\lambda}=266nm$, pulse) with a fixed power of 0.06[w] and various stage scanning velocities. Surface morphology of the ITO was investigated by AFM. Test OLEDs with surface treated ITO were fabricated by deposition of TPD (HTL), Ald3 (ETL/TML) and Al (cathode) thin films. Device performance of the OLEDs such as V-I-L was investigated using Source Measurement Unit (SMU: Keithly. Model 2400) and Luminance Measurement (TOPCON. BM-8).

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상압 플라즈마 표면처리를 통한 태양광모듈 커버글라스와 불소계 코팅의 응착력 향상 (Improved Adhesion of Solar Cell Cover Glass with Surface-Flourinated Coating Using Atmospheric Pressure Plasma Treatment)

  • 김태현;박우상
    • 한국전기전자재료학회논문지
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    • 제31권4호
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    • pp.244-248
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    • 2018
  • We propose a method for improving the reliability of a solar cell by applying a fluorinated surface coating to protect the cell from the outdoor environment using an atmospheric pressure plasma (APP) treatment. An APP source is operated by radio frequency (RF) power, Ar gas, and $O_2gas$. APP treatment can remove organic contaminants from the surface and improve other surface properties such as the surface free energy. We determined the optimal APP parameters to maximize the surface free energy by using the dyne pen test. Then we used the scratch test in order to confirm the correlation between the APP parameters and the surface properties by measuring the surface free energy and adhesive characteristics of the coating. Consequently, an increase in the surface free energy of the cover glass caused an improvement in the adhesion between the coating layer and the cover glass. After treatment, adhesion between the coating and cover glass was improved by 35%.

박막태양전지 하부전극용 Mo 박막특성 연구 (A Study on properties of Lower Electrode thin films solar cell for Mo thin film)

  • 양현훈;김영준;정운조;박계춘
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.321-322
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    • 2007
  • In order to increase the cost effectiveness of solar cells, module production should be treated more comprehensively. Back contact cells offer distinct advantage in the interconnection of cells to modules. Thereby Mo thin film were prepared in order to clarify optimum conditions for growth of the thin film depending upon process, and then by changing a number of deposition conditions and substrate temperature conditions variously, structural and electrical characteristics were measured. For the manufacture of the Mo were vapor-deposited in the named order. Among them, Mo were vapor-deposited by using the sputtering method in consideration of their adhesive force to the substrate, and the DC power was controlled so that the composition of Mo, while the surface temperature having an effect on the quality of the thin film was changed from R.T$[^{\circ}C]$ to $200[^{\circ}C]$ at intervals of $50[^{\circ}C]$. Micro-structural studies were carried out by XRD (D/MAX-1200, Rigaku Co.) and SEM (JSM-5400, Jeol Co.). Electrical properties were measured by CMT-SR3000 Measurement System.

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이온 에너지 분석에 의한 Sputter Ion Plating의 동작 특성 연구 (A Study on the Characteristics of Sputter ion Plating by ion Energy Analysis)

  • 성열문;이창영;조정수;박정후
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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    • pp.228-230
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    • 1994
  • A Spotter ion Plating(SIP) system with a r. f. coil electrode and the Facing Target Sputter(FTS) source was designed for high-quality thin film formation. The rf discharge was combined with DC facing target sputtering in order to enhance ionization degree of a sputtered atoms. The discharge voltage-discharge characteristics curves of a FTS source could be characterized by the fern of $I{\propto}V^n$ with n in the range of $8{\sim}12$. The energy of ions incident on the substrate depended on the sheath potential of DC biased substrate. The mean impact ion energy increased with negative bias voltage and rf power. The adhesive force of the TiN film formed was in the range of $30{\sim}50N$, and markedly influenced by substrate bias voltage.

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17cc급 자동차용 압축기의 고체윤활 최적화 및 구조 설계에 관한 연구 (Solid Lubrication Optimization and Structural Design of 17cc Automotive Compressor)

  • 양용군;진진;최요한;류성기
    • 한국기계가공학회지
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    • 제19권12호
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    • pp.56-61
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    • 2020
  • Fuel economy has always been a major issue in the automobile industry, especially owing to the associated environmental concerns. It is widely known that only 5-20% of the energy generated by automobiles running on internal combustion engine engines is used as power, while the rest is consumed because of friction between components. The main components of the reciprocating piston type compressor used in vehicles, such as the shaft, swash plate, piston, and cylinder, cause severe energy loss owing to frictional contact between each other. The wear contact between the main shaft and the other components is particularly severe. Most quality issues arise owing to the sticking phenomenon that occurs between these parts. In this study, a coating solution to reduce friction is prepared by mixing adhesive solid lubricant, organic binder-polyadimide, inorganic binder (Binder), and graphite in four different ratios, and the best combination is determined.

상시 근골격 모니터링과 재활을 위한 온스킨 센서 디바이스 기술 (Imperceptible On-Skin Sensor Devices for Musculoskeletal Monitoring and Rehabilitation)

  • 박찬우;구재본;진한빛;김윤정;임채현;홍찬화;김혜진
    • 전자통신동향분석
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    • 제37권2호
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    • pp.30-41
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    • 2022
  • As the society is superaging, the number of patients with movement disabilities due to musculoskeletal or nervous system illness is rapidly increasing. To improve public health and reduce medical expenses, it is essential to develop rehabilitation systems that allow patients to resume their daily-life activities. However, the existing musculoskeletal illness diagnosis and rehabilitation method is limited in terms of precision and efficiency because it is based on an empirical diagnosis and prescription without regard for individual characteristics. To overcome these limits, it is critical to design a novel concept of routine rehabilitation therapy device that is capable of inducing musculoskeletal balance by the precise analysis of musculoskeletal usage patterns via the motion and the muscle activity tracking of linked muscles. This study introduces the trend of on-skin sensor device technology for routine musculoskeletal monitoring and therapy. For on-skin rehabilitation systems, skin-adhesive and stretchable motion/posture, electromyography, pressure sensors, small-size and low-power wireless sensor interfaces, and user-friendly rehabilitation contents based on new algorithms are combined.

가로세로 폭의 제어가 가능한 슁글드 디자인 태양광 모듈 제조 (Fabrication of Shingled Design Solar Module with Controllable Horizontal and Vertical Width)

  • 박민준;김민섭;이은비;김유진;정채환
    • Current Photovoltaic Research
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    • 제11권3호
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    • pp.75-78
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    • 2023
  • Recently, the installation of photovoltaic modules in urban areas has been increasing. In particular, the demand for solar modules installed in a limited space is increasing. However, since the crystalline silicon solar module's size is proportional to the solar cell's size, it is difficult to manufacture a module that can be installed in a limited area. In this study, we fabricated a solar module with a shingled design that can control horizontal and vertical width using a bi-directional laser scribing method. We fabricated a string cell with a width of 1/5 compared to the existing shingled design string cells using a bi-directional laser scribing method, and we fabricated a solar module by connecting three strings in parallel. Finally, we achieved a conversion power of 5.521 W at a 103 mm × 320 mm area.