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Outgassing of hydrogen from a stainless steel vacuum chamber = Razplinjevanje vodika iz nerjavnega jeklaAvdiaj, Sefer ; Erjavec, Bojan, 1950-2023Due 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 delLeto - 2012Jezik - angleškiCOBISS.SI-ID - 905642
Avtor
Avdiaj, Sefer |
Erjavec, Bojan, 1950-2023
Teme
hydrogen outgassing |
stainless steel |
dimensionless time |
pressure-rise method |
throughput method |
gas-flow calibration coefficient |
razplinjevanje vodika |
nerjavno jeklo |
brezdimenzijski čas |
metoda naraščanja tlaka |
pretočna metoda |
kalibracijski koeficient za plinski pretok
vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 46, št. 2, mar.-apr. 2012, str. 161-167)
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Avdiaj, Sefer | 32480 |
Erjavec, Bojan, 1950-2023 | 05673 |
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