Vakuum in Forschung und Praxis

Aktuelle Ausgabe - Volume 30 Issue 5 (October/November 2018)

Titelbild

Editorial

Inhalt

Magazin

Vakuum

Die Entwicklung der Turbomolekularpumpe innerhalb der letzten drei Jahrzehnte

Summary Development of turbomolecular pumps within the last three decades On the occasion of the 30th anniversary of the “Vakuum in Forschung und Praxis” in 2018, the author puts the turbomolecular pump at the centre of the historical overview. From the first experiments, which led to the development of this key component of modern vacuum generation in high and ultra‐high vacuum technology, to further developments up to...

  • Heinz Barfuss
  • Seite 20-24

Flüssigkeitsring‐Vakuumpumpen

Summary Liquid ring vacuum pumps – Oldtimers of vacuum technology and yet highly up‐to‐date Liquid ring vacuum pumps were developed over a hundred years ago. In the meantime, vacuum technology has evolved considerably and offers optimum economic and technical solutions for a wide variety of applications. However, liquid ring vacuum technology still has its reason for existence and is the most suitable principle for vacuum...

  • Uli Merkle
  • Seite 25-27

Dünne Schichten

Reaktive Multischichtsysteme

Summary Reactive Multilayer Systems as tailored heat sources for plastic bondings The use of reactive multilayer systems (RMS) as a heat source for the manufacturing of thermoplastic material bondings makes it possible to completely or partially overcome the limitations of conventional joining techniques, such as gluing or welding. The release of energy, which takes place directly inside the joining zone within...

  • Erik Pflug, Jörg Bretschneider, Georg Dietrich, Martina Zimmermann, Andreas Leson
  • Seite 28-32

Vakuum

Bestimmung des Saugvermögens von Ionengetterpumpen

Summary The pumping speed of ion getter pumps – Comparison of measurement methods Pumping speed measurements of sputtering ion pumps are typically carried out according to DIN 28429 or ISO/DIS 3556‐1.2. In this article, we take a look at the differences between these two measurement methods. Based on experimental data, the impact of pressure holding times on reproducibility and absolute values of the extracted...

  • Stefan Meierott, Marco Walter, Klaus Bergner, Michael Flämmich, Ute Bergner
  • Seite 34-38

Behaviors of capacitive and Pirani vacuum gauges

Summary Knowing the exact pressure of the process has a great impact on the validity of the results, product quality, energy efficiency, and in some processes, on the security of work with the system. Hence, the calibration of the barometers and the accuracy of the readings should be taken seriously. Choosing the appropriate time interval for re‐calibration is done according to the extent and conditions of use, uncertainty, and the...

  • Ali Asghar Zavarian, Ali Arman, S. M. Jamal Ghotbi, Alireza Grayeli Korpi, Maryam Salehi, Mohsen Mardani, Fatemeh Hafezi, Azizollah Shafiekhani, Ştefan Ţăblu, Ashkan Sepehr Afghan
  • Seite 39-44

Atomic Scale Insights into Single‐Atom Catalysis

Summary “Single‐Atom” Catalysis (SAC) is a rapidly emerging field aimed at minimizing the amount of precious metals required to perform important catalytic reactions. Modern heterogeneous catalysts already utilize nanoparticles containing 100s to 1000s of atoms on an inexpensive support, but the dream of SAC is to do the same chemistry with single atoms. The concept is firmly entrenched, and SAC systems have demonstrated activity...

  • Gareth S. Parkinson
  • Seite 45-49

Gelernt ist Gelernt

Teil 5: Das Saugvermögen

  • Gerhard Voss
  • Seite 50-51

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