Hydrogen outgassing mechanism in titanium materials

Takeda, M.; Kurisu, Hiroki; Yamamoto, S.; Nakagawa, Hiroe; Ishizawa, Katsunobu

doi:10.1016/j.apsusc.2011.09.092

Cited by 21 publications

(12 citation statements)

References 23 publications

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“…The initial desorption temperature is delayed with the heating rates and pre-oxidized temperature increasing, especially the pre-oxidized temperature. The surface oxide layer of pre-oxidized TiH 2 restrains the H release [17]. The oxide decomposes above 550 C, which results in the fast H release.…”

Section: Resultsmentioning

confidence: 99%

Deoxidization mechanism of hydrogen in TiH2 dehydrogenation process

Wang

Pan

Zhang

et al. 2016

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 99%

Deoxidization mechanism of hydrogen in TiH2 dehydrogenation process

Wang

Pan

Zhang

et al. 2016

International Journal of Hydrogen Energy

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“…This outgassing depends on the material, so its selection is of paramount importance to vacuum system design. A large body of literature exists for the outgassing rates of the common vacuum chamber materials stainless-steel, [2][3][4][5][6][7][8] aluminum, [9][10][11] and titanium; [12][13][14][15][16] the citations represent a small selection of the available literature. However, because of differences in materials, material treatments, and measurement techniques, published outgassing rates often vary and questions arise as to the outgassing rate that can be practically achieved.…”

Section: Introductionmentioning

confidence: 99%

Outgassing rate comparison of seven geometrically similar vacuum chambers of different materials and heat treatments

Fedchak

Scherschligt

Avdiaj

et al. 2021

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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We have measured the water and hydrogen outgassing rates of seven vacuum chambers of identical geometry but constructed of different materials and heat treatments.Chambers of five different materials were tested: 304L, 316L, and 316LN stainless steels; titanium; and aluminum. In addition, chambers constructed of 316L and 316LN stainless steel were subjected to a vacuum-fire process, where they were heated to approximately 950 °C for 24 hours while under vacuum. These latter two chambers are designated as 316L-XHV and 316LN-XHV. Because all the chambers were of identical geometry and made by the same manufacturer, a relative comparison of the outgassing rates among these chambers can be made. Water outgassing rates were measured as a function of time using the throughput technique. The results for the 304L chamber were in accord with the results of Li and Dylla. 1 The water outgassing results for the 316L, 316LN, 316L-XHV, 316LN-XHV were all similar, but lower than those of 304L by a factor of 3 to 5

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“…We utilize sapphire, which has no documented helium permeation that the authors are aware of, and use C-cut windows to minimize birefringence and maximize strength. The body of the package is fabricated from commercially pure titanium since it matches well with the coefficient of thermal expansion of sapphire, has a much lower hydrogen outgassing rate than stainless steel, [19] and is nonmagnetic.…”

Section: Introductionmentioning

confidence: 99%

A passively pumped vacuum package sustaining cold atoms for more than 200 days

Little,

Hoth,

Christensen

et al. 2021

Preprint

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Compact cold-atom sensors depend on vacuum technology. One of the major limitations to miniaturizing these sensors are the active pumps-typically ion pumps-required to sustain the low pressure needed for laser cooling. Although passively pumped chambers have been proposed as a solution to this problem, technical challenges have prevented successful operation at the levels needed for cold-atom experiments. We present the first demonstration of a vacuum package successfully independent of ion pumps for more than a week; our vacuum package is capable of sustaining a cloud of cold atoms in a magneto-optical trap (MOT) for greater than 200 days using only non-evaporable getters and a rubidium dispenser. Measurements of the MOT lifetime indicate the package maintains a pressure of better than 2 × 10 −7 Torr. This result will significantly impact the development of compact atomic sensors, including those sensitive to magnetic fields, where the absence of an ion pump will be advantageous.

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Hydrogen outgassing mechanism in titanium materials

Cited by 21 publications

References 23 publications

Deoxidization mechanism of hydrogen in TiH2 dehydrogenation process

Deoxidization mechanism of hydrogen in TiH2 dehydrogenation process

Outgassing rate comparison of seven geometrically similar vacuum chambers of different materials and heat treatments

A passively pumped vacuum package sustaining cold atoms for more than 200 days

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