Narodna in univerzitetna knjižnica, Ljubljana (NUK)
Naročanje gradiva za izposojo na dom
Naročanje gradiva za izposojo v čitalnice
Naročanje kopij člankov
Urnik dostave gradiva z oznako DS v signaturi
  • Outgassing of hydrogen from a stainless steel vacuum chamber = Razplinjevanje vodika iz nerjavnega jekla
    Avdiaj, Sefer ; Erjavec, Bojan
    Due to outgassing from the walls of vacuum calibration chambers, the generation of the calibration pressure in primary vacuum calibration systems operating below 10[sup]{-6} Pa becomes un-accurate. ... Austenitic stainless steel (SS) is the most common construction material for ultrahigh vacuum (UHV) and extremely high vacuum (XHV) chambers. Hydrogen is the predominant residual gasat very low pressures in SS vacuum systems, i.e., in the UHV and XHV range. Therefore, the reduction of the hydrogen outgassing rate is the most challenging problem in achieving pressures in those ranges. In this paper, a vacuum chamber with a wall thickness of 2.62 mm and made from AISI type 304 L SS was examined with the aim of mitigating the outgassing rate. The heat treatments were carried out at 250 °C for 380 h and at 350 °C for 140 h. After baking at 250 °C for 380 h (corresponding to a dimensionless time Fo = 3.09), an outgassing rate q = 2.86 * 10[sup]{-13} mbar L s[sup]{-1} cm[sup]{-2} was achieved at room temperature (RT). This RT outgassing rate was further reduced to q = 5.7 * 10[sup]{-14} mbar L s[sup]{-1} cm[sup]{-2} after baking for another 140 h at 350 °C (Fo = 8.66, resulting in a total dimensionless time SFo = 11.75).
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 46, št. 2, mar.-apr. 2012, str. 161-167)
    Vrsta gradiva - članek, sestavni del
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 905642

    Povezava(-e):

    http://mit.imt.si/Revija/
    Digitalna knjižnica Slovenije - dLib.si

vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 46, št. 2, mar.-apr. 2012, str. 161-167)

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