• Title/Summary/Keyword: Metal Sealing

Search Result 75, Processing Time 0.025 seconds

An Experimental Study on the Evaluation of Anti-corrosion Performance of High-frequency Arc Metal Spray film on Steel using EIS Method (전기화학적 임피던스 분광법(EIS)을 이용한 고주파 아크 금속용사 피막의 강재 방식성능 평가에 관한 실험적 연구)

  • Choe, Hong-Bok;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2014.11a
    • /
    • pp.61-62
    • /
    • 2014
  • To evaluate anti-corrosion performance of high-frequency arc metal spray film in accordance with metal type and epoxy sealing coat application status, electrochemical impedance spectroscopy(EIS) method was conducted in this study. As a result, in case of applying Al-Mg alloy metal spray film, it showed the best polarization resistance. In case of applying epoxy sealing coat, it showed increased polarization resistance of arc metal spray film. Through this experiment, it is judged that Al-Mg alloy arc metal spray film with epoxy sealing coat can increase the biggest anti-corrosion performance of high-frequency arc metal spray film on steel.

  • PDF

Role of Added Metal Oxide in the Adherence Mechanism of Low Melting Glass to Several Metal Seals (저융점유리와 각종금속과의 봉착기구에 있어서 금속산화물의 역할)

  • 정창주
    • Journal of the Korean Ceramic Society
    • /
    • v.11 no.1
    • /
    • pp.3-9
    • /
    • 1974
  • The role of added metal oxide in the adherence mechanism of low melting glass to several metal plates such as oxygen free high conducting copper, low carbon steel, chrominum galvanized on copper, and stainless steel was investigated. The metal oxide which added to glass were cupric oxide, ferric oxide, chromic oxide, and stainless steel oxide. The glass to that various metla oxide were added, sealed with several metal plates in the electric furnace at $650^{\circ}C$ for 5 minutes. The results as follows; 1) The interfacial reaction was promoted and strong chemical bonding with glass and metals by which the surface energy was decreased showed excellent sealing by addition of metal oxide. 2) When the interfacial reaction of glass and metals was promoted by addition of metal oxide found out that various adhernece mechanism were related to the sealing. 3) When the amount of metal oxide addition was 3-5% the excellent sealing was achieved.

  • PDF

Direct Sealing Glass-Ceramics to Metal (직접 결합방법에 의한 Glass-Ceramics과 금속의 접합)

  • Kim, Hwan;Lee, Ki-Kang
    • Journal of the Korean Ceramic Society
    • /
    • v.18 no.2
    • /
    • pp.99-104
    • /
    • 1981
  • Glass-ceramics possessed a number of characteristics which suggested their suggested their use for sealing to metals. The choice of particular glass-ceramics compositions for this application is governed by various factors, including workability of the glasses, thermal expansion characteristics and the matching of these to appropriate metals. Other properties, such as mechanical strength, determined the performance of glass-ceramics to metal seals. The purpose of the present study was to investigate direct sealing behaviour of copper to $Li_2O-ZnO-SiO_2$ system glass-ceramics. The design of the seal was a concentric seal which might contribute to the strong bond formation by providing compressive stress during thermal excursions. Tensile strengths of sealing layers were measured by Instron test machine. The layers were examined by electron probe microanalyzer. Crsystallization rate was increased with the amount of ZnO or $Li_2O$, and ZnO increased the sealing strength, but $Li_2O$ lowered it. Sealing mechanism was due to the formation of metal oxides, which acted as binder between copper and glass-ceramics. The nickle-plated copper seal with 10% $Li_2O$ and 30% ZnO was the most strong seal, and its sealing strength was more than 56kg/$\textrm{cm}^2$.

  • PDF

Analysis of Hydrogen-tightness on the Metal Sealing of a Fuel Pipe for FCEV according to Material Change of the Fitting Body (체결부 재료에 따른 FCEV 연료파이프 메탈 씰링부의 기밀성 분석)

  • Lee, J.M.;Han, E.S.;Chon, M.S.;Lee, H.W.
    • Transactions of Materials Processing
    • /
    • v.28 no.5
    • /
    • pp.266-274
    • /
    • 2019
  • Metal sealing is used to connecting the parts between valves and fuel pipes for a FCEV which utilizes hydrogen gas of 700 bar. Instead of general carbon steel, stainless steel is the primary material used to manufacture fuel pipes due to hydrogen embrittlement. The shape of deformation between metals is an important factor on the air-tightness of the metal to metal contact. Since the stainless steel pipe is hardened using the plastic forming during the tip shaping stage, this work hardening could have an effect on the deformed shape and characteristics of contact surfaces in fastening of pipes. In this paper, the deformation history of the pipe model was considered in order to analyze the hydrogen-tightness on the metal sealing part. The contact distance and the forward displacement for fastening were compared using experimental results and the simulation results. The simulation of the effect of material change on the fitting body demonstrated that the hardness or the strength of the formed tip of the pipe was designed to a proper valued level since the characteristics of the contact surface was exhibited better when the strength of the pipe was lower than that of the fitting body.

Analysis on Fitting Characteristics of a Metal-Sealing Pipe of the Hydrogen Fuel Tank for FCEV (FCEV용 고압연료탱크 메탈씰링 파이프의 체결특성 해석)

  • Lee, J.M.;Jeong, J.H.;Chon, M.S.;Lee, H.W.
    • Transactions of Materials Processing
    • /
    • v.27 no.1
    • /
    • pp.54-59
    • /
    • 2018
  • In connecting parts of a hydrogen fuel cell vehicle, since the rubber ring is permeable to hydrogen, it is necessary to use a metal sealing structure which ensures leakage stability. Finite element analysis was performed to verify the fitting characteristics of the metal sealing structure, which is used to connect the pipe to a high pressure hydrogen FCEV tank. Deformation shape, contact distance and axial load were compared experimentally and these values were in agreement with each other. In the contact surface, between the pipe and the fitting body, the stress at the edge of the contact surface was higher than the center point, which was considered to be a good characteristic in view point of the leakage. The location of the contact points has almost no change in the upper part of the fitting, but that of the lower parts move downward as the fastening amount increases. The contact pressure at the lower part is maintained at the same constant level.

A Study on the Design Safety of Metal Seals in High Pressure Vessels (초고압 압력용기에서 메탈시일의 설계 안전성에 관한 연구)

  • Kim Chung Kyun
    • Journal of the Korean Institute of Gas
    • /
    • v.9 no.1 s.26
    • /
    • pp.26-32
    • /
    • 2005
  • This paper presents the design safety of metal seals in pressure vessels. For a high-pressure vessel, a metal seal is usually used as a primary sealing, and an elastomeric rubber O-ring is adopted as a secondary sealing unit. The FEM computed results show that an aluminium material for sealing a gas leakage is superior to a steel one because of the thermal expansion rate. The deformation and stress distributions on the metal seal and pressure vessel structures are mainly dominated by transferred temperature compared to those of the gas pressure in which is supplied by an external pump. Thus, the temperature of a metal seal material should be restricted to under $200^{\circ}C$.

  • PDF

Evaluation of physical properties of Zn-Al metal coating according to arc metal spray surface treatment method (아크 금속 용사 표면 처리 방법에 따른 Zn-Al 금속 용사 피막의 물리적 특성 평가)

  • Jang, Jong-Min;Kim, Yeung-Kwan;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2022.11a
    • /
    • pp.89-90
    • /
    • 2022
  • Arc metal spraying is a widely used method for improving the performance of construction structures such as corrosion resistance and electromagnetic wave shielding. However, when arc metal spraying is applied to a concrete structure, adhesion performance may deteriorate. Therefore, the effect of each surface treatment method on the physical properties between the arc metal spray coating and concrete was reviewed by evaluating the deposition efficiency and adhesion performance according to the arc metal spray surface treatment method (surface reinforcing agent, roughening agent, and sealing agent). As a result, it is suggested as an optimal surface treatment condition to induce non-interface failure by using a roughening agent and to improve the properties of concrete and metal coatings by applying a surface reinforcing agent and sealing agent.

  • PDF

A Study on the Sealing Characteristics of O-rings in Gas Pressure Vessel (O-링이 장착된 가스압력용기의 밀봉특성에 관한 연구)

  • Kim Chung Kyun;Cho Seung Hyun
    • Journal of the Korean Institute of Gas
    • /
    • v.7 no.3 s.20
    • /
    • pp.51-57
    • /
    • 2003
  • This paper presents the temperature distribution and deformation characteristics of O-ring groove geometry in which is strongly related the sealing performance of pressure vessels. A working gas in pressure vessel may be heated by a heater and pressurized by a gas compressor. Thus, the pressure vessel should keep high Pressure and temperature for a limited working period. For these operation conditions, the working gas in pressure vessels should not leak to the air by two O-rings with a rectangular groove. The FEM computed results indicate that the thermal and mechanical properties of metal sealing material is very important for stopping a leakage of hot gas in a vessel. Based on the results, high thermal conductive and low mechanical strength material is recommended as a metal sealing one. This may improve the sealing characteristics of O-ring sealing mechanism with a rectangular groove, which reduces the sealing gap between a flange and a cylinder and the width of O-ring groove.

  • PDF

Wetting Phenomena between Sealing Glass and Free Cutting Steel (접합유리와 쾌삭강간의 Wetting 현상)

  • Kim, Heung;Kim, Chong-Hee
    • Journal of the Korean Ceramic Society
    • /
    • v.19 no.1
    • /
    • pp.24-34
    • /
    • 1982
  • The effect of the several variables on wetting of AISIB1113 steel by molten glass was studied by Sessible-drop method. Experimental variables were temperature, firing atmospheres, Fe2O3 addition to the sealing glass and steel surface conditions. The degree of wetting in terms of contact angles between molten glass and metal tested at different test conditions was analyzed by using Young's equation. The results showed that contact angles in H2 atmosphere in the glass metal systems were high but in N2 atmosphere, were small for studied glass metal systems. Especially, when the glass drop was in contact with oxidized steel in N2 atmosphere, The best adherence with contact angle of approximately 9°was obtained. In the case of Fe2O3 addition in glass contact angles subtantially increased due to the increase of surface tension of glass. Wetting phenomena were also discussed under the basis of these experimental results.

  • PDF

The Design of Flat Linear Induction Pump for Transferring Reactor Coolant (원자로 냉각재 이송을 위한 평편형 리니어 유도펌프의 설계)

  • Jang, S.M.;Wu, J.S.;Kim, H.K.
    • Proceedings of the KIEE Conference
    • /
    • 1998.11a
    • /
    • pp.10-12
    • /
    • 1998
  • Pumping liquid metal in nuclear power plant application by conventional centrifugal pumps pose difficulties such as bearing wear out at high temperatures and leak proof sealing of the liquid metal. MHD machine is obtained by replacing solid conducting secondary of conventional motors with ionized gas or liquid metal. It is used for reactor cooling pump because of construction simplicity, perfect sealing and easy operation/maintenance MHD pump is complicated because it includes electromagnetic and hydrodynamic phenomena. The principle of MHD Pumps is described in this paper. We design small laboratory size Flat Linear Induction Pump(FLIP) for transferring sodium.

  • PDF