Experimental study of glass to metal seals for parabolic trough receivers

Lei, Dongqiang; Wang, Zhifeng; Li, Jian; Li, Jianbin; Wang, Zhijian

doi:10.1016/j.renene.2012.04.033

Cited by 51 publications

(21 citation statements)

References 13 publications

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“…These oxide thicknesses are at the lower end, or below, that is generally recommended for glassto-metal sealing with Kovar [3,8,11,14,15], yet the oxides formed at 800°C still show signs of poor adherence. The oxide on the 800°C wire was easily dislodged if the sample was not treated with great care, whilst the 700°C oxide could not be removed when the surface was abraded with a stainless steel scalpel, indicating better adherence.…”

Section: Resultsmentioning

confidence: 93%

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

Yates

Mallinson

et al. 2017

Oxid Met

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This work provides new insight and evidence that challenges and extends the accepted view of the oxidation behaviour of Kovar (ASTM-15). Specimens of 2 mm diameter Kovar wire were oxidised in air at 700 or 800°C for 10 min. The resulting oxide layers were analysed by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, scanning transmission electron microscopy and Raman spectroscopy. Oxide layers of approximately 2 and 4 lm thickness were formed at 700 and 800°C, respectively. These were found to contain iron, cobalt and traces of nickel. The combination of analysis techniques revealed that the oxide contains Fe 2 O 3 in addition to (Fe, Co, Ni) 3 O 4 , a spinel oxide, in contrast to the combinations of Fe 3 O 4 , Fe 2 O 3 and FeO that are typically reported. The oxide layer was found to be complex, consisting of multiple layers with different compositions, which is overlooked in the existing literature.Keywords Raman spectroscopy Á Spinels Á X-ray photoelectron spectroscopy (XPS) Á Scanning electron microscopy (SEM) Á Glass-to-metal seal

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Section: Resultsmentioning

confidence: 93%

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

Yates

Mallinson

et al. 2017

Oxid Met

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“…For experimental determination of hermeticity a number of test methods are available. The helium leak test as applied by Lei et al [15] and technically described by Kutzke [14] is an accredited method and provides accurate results down to leak rates of 10 −9 mbar l/s. However, for samples with low hermeticity the pressure difference of 1 bar can cause interface failure during helium leak test which leads to damage of the helium leak detector.…”

Section: Seal Hermeticitymentioning

confidence: 99%

Sealing of glass with titanium by glass pressing at the softening point

et al. 2019

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Hermetic and mechanically strong glass-to-metal seals are required for many applications in technological fields such as aerospace engineering or medical engineering. While traditional glass-to-metal bonding technologies require melting of the glass, modern technologies such as anodic bonding use glass in its solid state. In this publication, a novel glassto-metal bonding method with process temperatures around the softening point of the glass material is investigated. A glass window (silica based crown glass B270) in a titanium (grade 5) housing is manufactured by applying compressive force to the glass in a controlled low pressure argon atmosphere. Adherence of the glass-to-metal interface is determined with a universal testing machine. Hermeticity is measured directly with either pressure gain test or helium leak test. Experiments were performed in a full factorial design with 3 different process temperatures, 3 different process forces and 3 different methods for preparing the titanium surface. The results indicate that the bonding method is capable of producing hermetic seals with leak rates below 10 −8 mbar l/s. Roughening of the metal surface generally improves both hermeticity and interface strength. Bonding strength can be further improved by increasing either processes temperature or, especially for rough surfaces, process force. For improving hermeticity either processes temperature or, especially for smooth surfaces, process force must be increased. The results indicate that successful bonding of glass and titanium with the new bonding method is influenced by the effects of mechanical interlocking and chemical reactions at the material interface.

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“…Authors observed that the results show that excellent glass-to-Kovar sealing can be obtained with a Kovar oxidation weight gain of about 0.3-0.8 mg/cm 2 . A new solar receiver was developed by the new sealing method by the authors [7]. The operation principle and design method of a new trough solar concentrator is presented by Tao Tao et.al in this paper.…”

Section: Literature Surveymentioning

confidence: 99%

Experimental Investigations on Mild Steel Compound Parabolic Reflector with Aluminum Foil as Selective Surface and Top Cover

Sagade¹,

Shinde

Patil³

2014

Energy Procedia

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The paper explores the experimental results of the prototype compound parabolic trough solar collector made of mild steel and its surface coated with an aluminum foil of thickness 10 micron as a selective surface. This prototype has been tested with top cover for instant water heating and steam generation application. The performance of collector has been evaluated with receiver coated with selective absorber coatings. This line focusing parabolic trough yields instantaneous efficiency of 60 % with top cover. Actual field experimentation for performance evaluation of prototype system has been done during month of April and May 2012 at Shivaji university, Kolhapur [Latitude: 16.42° N, Longitude: 74.13°W].For the hotter climatic conditions, this type of system may play an important role in industrial process heating applications.

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Experimental study of glass to metal seals for parabolic trough receivers

Cited by 51 publications

References 13 publications

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

Sealing of glass with titanium by glass pressing at the softening point

Experimental Investigations on Mild Steel Compound Parabolic Reflector with Aluminum Foil as Selective Surface and Top Cover

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