Chapter 14. The Effects of 304L Stainless Steel Pre-Oxidation on Bonding to Alkali Barium Silicate Glass

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. D. F. Susan,
  2. J. A. Van Den Avyle,
  3. S. L. Monroe,
  4. N. R. Sorensen,
  5. B. B. McKenzie,
  6. J. R. Michael,
  7. J. E. Christensen and
  8. C. A. Walker

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch14

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Susan, D. F., Van Den Avyle, J. A., Monroe, S. L., Sorensen, N. R., McKenzie, B. B., Michael, J. R., Christensen, J. E. and Walker, C. A. (2006) The Effects of 304L Stainless Steel Pre-Oxidation on Bonding to Alkali Barium Silicate Glass, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch14

Author Information

  1. Sandia National Laboratories Albuquerque, NM 87185

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

SEARCH

Keywords:

  • focused ion beam (FIB);
  • transmission electron microscopy (TEM);
  • oxidation;
  • sectioning;
  • sessile drop

Summary

An oxidation treatment, often termed “pre–oxidation”, is performed on austenitic stainless steel prior to joining to alkali barium silicate glass to produce hermetic seals. The resulting thin oxide acts as a transitional layer and a source of Cr and other elements which diffuse into the glass during the subsequent bonding process. Pre–oxidation is performed in a low pO2 atmosphere to avoid iron oxide formation and the final oxide is composed of Cr203, MnCr2O4 spinel, and SiO2. Significant heat–to–heat variations in the oxidation behavior of 304L stainless steel have been observed, which result in inconsistent glass–to–metal (GTM) seal behavior. The objectives of this work were to characterize the stainless steel pre–oxidized layer and the glass/oxide/304L interface region after glass sealing. The 304L oxidation kinetics were determined by thermogravimetric (TG) analysis and the glass/metal seals characteristics were studied using sessile drop tests, in which wetting angles were measured and glass adhesion was analyzed. The pre–oxidized layers and glass/metal interface regions were characterized using metallography, focused ion beam (FIB) sectioning, scanning and transmission electron microscopy, and electron probe microanalysis (EPMA). The results show that poor glass sealing behavior is associated with a more continuous layer of SiO2 at the metal/oxide interface.