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Homogeneity Characterization of NBS Spectrometric Standards II: Cartridge Brass and Low-Alloy Steel

  • H. Yakowitz
  • D. L. Vieth
  • K. F. J. Heinrich
  • R. E. Michaelis
Conference paper

Abstract

Most modern instrumental methods of analysis depend on the use of known standards of composition for calibration. Newer analytical techniques, such as the solids mass spectrometer, laser probe and, especially, the electron-probe micro-analyzer have reduced the amount of a sample which can be analyzed quantitatively to a range of about 0.1 to as small as 0.00005 μg. As a corollary to these micro-analytical advances, homogeneity requirements have become severe to meet analytical standards. This paper describes a continuation of the National Bureau of Standards’ effort to characterize more fully existing standards as to suitability for the new microanalytical techniques.1 An NBS cartridge brass sample in both the wrought (NBS-1102) and chill cast forms (NBS-C1102), as well as a low-alloy steel sample (NBS-463), have been investigated by means of electron-probe microanalysis and optical metallography. Some 17 elements are contained in the brass, while 25 elements are found in the steel. Results for 10 elements in the steel and 6 elements in the brass are presented. In the steel, iron, nickel, copper, and silicon are essentially distributed homogeneously at micron levels, while manganese, tantalum, niobium, zirconium, sulfur, and chromium are not. In the brass, copper and zinc are distributed homogeneously at micron levels while lead, sulfur, aluminum, and silicon are not. Electron-probe microanalyzer results indicate that both NBS-1102 and NBS-C1102 brass are suitable for use as a calibration standard for electron-probe microanalysis as well as other microanalytical techniques, such as the solids mass spectrometer. The results for brass have been corroborated by a number of laboratories using the electron-probe analyzer.

Keywords

Knoop Hardness Micron Level Cast Form Microanalytical Technique Inclusion Identification 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. E. Michaelis, H. Yakowitz, and G. A. Moore, “Metallographic Characterization of an NBS Spectrometric Low-Alloy Steel Standard,” J. Res. Natl. Bur. Std. A 68: 343 (1964). Issued in expanded form as Natl. Bur. Std. (U.S.) Misc. Publ. 260–3 (1964) 17 pp.Google Scholar
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    R. E. Michaelis, L. L. Wyman, and R. Flitsch, “Preparation of NBS Copper-Base Spectrochemical Standards,” Natl. Bur. Std. (U.S.), Misc. Publ. 260–2 (1964), 36 pp.Google Scholar
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    K. F. J. Heinrich, X-ray Absorption Uncertainty, The Electron Microprobe, John Wiley Sons, Inc., New York (1966), p. 296.Google Scholar

Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • H. Yakowitz
    • 1
  • D. L. Vieth
    • 1
  • K. F. J. Heinrich
    • 1
  • R. E. Michaelis
    • 1
  1. 1.National Bureau of StandardsUSA

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