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  2. Lithium oxide - Wikipedia

    en.wikipedia.org/wiki/Lithium_oxide

    Burning lithium metal produces lithium oxide. Lithium oxide forms along with small amounts of lithium peroxide when lithium metal is burned in the air and combines with oxygen at temperatures above 100 °C: [3] 4Li + O 2 → 2 Li 2 O. Pure Li 2 O can be produced by the thermal decomposition of lithium peroxide, Li 2 O 2, at 450 °C [3] [2] 2 Li ...

  3. Cryogenic seal - Wikipedia

    en.wikipedia.org/wiki/Cryogenic_seal

    Clean, oxide-free indium will cold weld to itself. The mating ends of a wire seal will weld together under compression. [12] A more reliable alternative to a seal made from indium wire is a seal that uses an indium washer. Washers minimize the risk of seal degradation and cryogenic leaks by eliminating the interface between connected butt ends ...

  4. Seal (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Seal_(mechanical)

    A seal is a device or material that helps join systems, mechanisms or other materials together by preventing leakage (e.g. in a pumping system), containing pressure, or excluding contamination. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets .

  5. Labyrinth seal - Wikipedia

    en.wikipedia.org/wiki/Labyrinth_seal

    Indeed, many gas turbine engine seals leak by design. [4] Labyrinth seals are also found on pistons, which use them to store oil and seal against high pressure during compression and power strokes, as well as on non-rotating shafts. In these applications, it is the long and difficult path and the formation of controlled fluid vortices plus some ...

  6. Lithium superoxide - Wikipedia

    en.wikipedia.org/wiki/Lithium_superoxide

    At higher (but still cryogenic) temperatures, lithium superoxide can be produced by ozonating lithium peroxide (Li 2 O 2) in freon 12: Li 2 O 2 (f 12) + 2 O 3 (g) → 2 LiO 2 (f 12) + 2 O 2 (g) The resulting product is only stable up to −35 °C. [5] Alternatively, lithium electride dissolved in anhydrous ammonia will reduce oxygen gas to ...

  7. Leak detection - Wikipedia

    en.wikipedia.org/wiki/Leak_detection

    Thermal camera system with video analysis software detecting an oil leak from a valve at 50 feet and 150 feet in heavy rain Externally based systems use local, dedicated sensors. [ 3 ] Such LDS are highly sensitive and accurate, but system cost and complexity of installation are usually very high; [ 17 ] applications are therefore limited to ...

  8. Ferrofluidic seal - Wikipedia

    en.wikipedia.org/wiki/Ferrofluidic_seal

    Ferrofluid-based seals used in industrial and scientific applications are most often packaged in mechanical seal assemblies called rotary feed-throughs, which also contain a central shaft, ball bearings, and outer housing. The ball bearings provide two functions: maintaining the shaft's centering within the seal gap and supporting external loads.

  9. Glass-to-metal seal - Wikipedia

    en.wikipedia.org/wiki/Glass-to-metal_seal

    Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...

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