Effects of catalytic surface layer on Zr-based alloy getters for hydrogen absorption

Young Joon Yoon, Keun Wook Kim, Hong Koo Baik, Serk Won Jang, Sung Man Lee

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Hydrogen characteristics of Zr-based alloy getters fabricated in the forms of bulk were investigated. Non-evaporable getters (NEGs) have been widely used in vacuum devices, but thermal activation process at high temperature and high vacuum environment is inevitably required for efficient sorption rate. In order to solve this problem and improve sorption kinetics, we developed and characterized Ni-coated NEGs. Ni-coated NEGs show good gettering performance and fast sorption kinetics without any activation process, compared to conventional Zr-based NEGs. It is mainly caused by the catalytic effect of surface Ni layer. Surface Ni plays an important role as a catalyst that enables hydrogen to dissociate on surface more easily and also as a protection layer against oxidation. Consequently, Ni-coated NEGs can be easily applicable to vacuum devices because those need not go through the activation process and show fast hydrogen sorption kinetics.

Original languageEnglish
Pages (from-to)138-142
Number of pages5
JournalThin Solid Films
Volume350
Issue number1
DOIs
Publication statusPublished - 1999 Aug 15

Fingerprint

getters
Getters
Hydrogen
surface layers
sorption
Sorption
hydrogen
Chemical activation
activation
Vacuum
vacuum
Kinetics
kinetics
high vacuum
catalysts
Oxidation
oxidation
Catalysts

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Joon Yoon, Young ; Wook Kim, Keun ; Baik, Hong Koo ; Jang, Serk Won ; Lee, Sung Man. / Effects of catalytic surface layer on Zr-based alloy getters for hydrogen absorption. In: Thin Solid Films. 1999 ; Vol. 350, No. 1. pp. 138-142.
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Effects of catalytic surface layer on Zr-based alloy getters for hydrogen absorption. / Joon Yoon, Young; Wook Kim, Keun; Baik, Hong Koo; Jang, Serk Won; Lee, Sung Man.

In: Thin Solid Films, Vol. 350, No. 1, 15.08.1999, p. 138-142.

Research output: Contribution to journalArticle

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T1 - Effects of catalytic surface layer on Zr-based alloy getters for hydrogen absorption

AU - Joon Yoon, Young

AU - Wook Kim, Keun

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AU - Jang, Serk Won

AU - Lee, Sung Man

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AB - Hydrogen characteristics of Zr-based alloy getters fabricated in the forms of bulk were investigated. Non-evaporable getters (NEGs) have been widely used in vacuum devices, but thermal activation process at high temperature and high vacuum environment is inevitably required for efficient sorption rate. In order to solve this problem and improve sorption kinetics, we developed and characterized Ni-coated NEGs. Ni-coated NEGs show good gettering performance and fast sorption kinetics without any activation process, compared to conventional Zr-based NEGs. It is mainly caused by the catalytic effect of surface Ni layer. Surface Ni plays an important role as a catalyst that enables hydrogen to dissociate on surface more easily and also as a protection layer against oxidation. Consequently, Ni-coated NEGs can be easily applicable to vacuum devices because those need not go through the activation process and show fast hydrogen sorption kinetics.

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