Abstract
The oxidation and hot corrosion behavior of a tungsten-fiber, reinforced Ni~ 20Cr alloy has been examined under the following exposure conditions: (a) pure oxygen at 1 atm pressure; (b) sulfidation in H2–10 %H2S; (c) presulfidation in H2–10 %H2S followed by oxidation in oxygen; and (d) oxidation in 1 atm oxygen after precoating with approximately 1 mg/cm2 of Na2SO4. Rapid oxidation of the tungsten fibers causes considerable distortion of the matrix and catastrophic degradation of the matrix follows. Inter diffusion between the matrix and the fibers is also important. During sulfidation, only the matrix forms sulfides, the fibers remaining unaffected. Consequently, presulfidation, although having a dramatic effect on the oxidation of the matrix does not have a damaging effect on the fibres. Equally, the presence of sodium sulfate is not critical, although severe oxidation of the exposed tungsten fibers is still observed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
R. A. Signorelli and J. W. Weeton, NASA-SP-227, 187 (1970).
T. T. Serofini, NASA-SP-227, 207 (1970).
D. W. Petrasek, R. A. Signorelli, and J. W. Weeton, NASA-TN-D-4787 (1968).
D. W. Petrasek and R. A. Signorelli, NASA-TN-D-5139 (1969).
M. E. El-Dahshan, D. P. Whittle, and J. Stringer,Oxid. Metals 8, 179 (1974).
J. A. Goebel and F. S. Pettit,Met. Trans,1, 1943 (1970);2, 3241 (1971).
J. A. Goebel, F. S. Pettit, and G. W. Goward,Met. Trans. 4, 578 (1973).
N. S. Bornstein and M. A. De Crescente,Trans. Met. Soc. AIME 245, 1947 (1969);Met. Trans. 2, 1971 (1971).
D. M. Johnson, D. P. Whittle, and J. Stringer,Corrosion Sci. (in press).
I. Kvernes and P. Kofstad,Scand. J. Met. 2, 291 (1973).
D. W. Petrasek and R. A. Signorelli, ASTM STP-460, 405 (1969).
G. N. Lewis and M. Randall,Thermodynamics (McGraw-Hill, New York, 1961), p. 173.
G. C. Wood, I. G. Wright, T. Hodgekiess, and D. P. Whittle,Werkstoffe Korrosion 21, 900 (1970).
G. Romeo, W. W. Smeltzer, and J. Kirkaldy,J. Electrochem. Soc. 118, 1336 (1971).
G. R. St. Pierre, W. T. Ebihara, M. J. Pool, and R. Speiser,Trans. Met. Soc. AIME 224, 259 (1962).
B. Phillips and L. L. Y. Chang,Trans. Met. Soc. AIME 230, 1203 (1964).
W. W. Webb, J. T. Norton, and C. Wagner,J. Electrochem. Soc. 103, 107 (1956).
M. Farber and D. H. Ehrenberg,J. Electrochem. Soc. 99, 427 (1952).
C. J. Spengler and R. Viswanathan,Met. Trans. 3, 161 (1972).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
El-Dahshan, M.E., Whittle, D.P. & Stringer, J. The oxidation and hot corrosion behavior of tungsten-fiber reinforced composites. Oxid Met 9, 45–67 (1975). https://doi.org/10.1007/BF00613494
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00613494