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Refractory Oxide Coatings on SiC Ceramics

Published online by Cambridge University Press:  29 November 2013

Kang N. Lee ,
Nathan S. Jacobson  and
Robert A. Miller
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Silicon-based ceramics are leading candidate materials for high-temperature structural applications such as heat exchangers, advanced gas turbine engines, and advanced internal combustion engines. They have excellent oxidation resistance in clean oxidizing environments due to the formation of a slow-growing silica scale (SiO2). However, durability in high-temperature environments containing molten salts, water vapor, or a reducing atmosphere can limit their applications. Molten salts react with silica scale to form liquid silicates. Oxygen readily diffuses through liquid silicates and rapidly oxidizes the substrate. High water vapor levels lead to hydrated silica species, such as Si(OH)4(g) and subsequent evaporation of protective scale. Complex combustion atmospheres containing oxidizing (CO2, H2O) and reducing (CO, H2) gases form SiO2 and then reduce it to SiO(g). In situations with extremely low partial pressures of oxidant, direct formation of SiO(g) occurs. All these reactions can potentially limit the formation of a protective silica scale and thus lead to an accelerated or a catastrophic degradation.

One approach overcoming these potential environmental limitations is to apply a barrier coating which is environmentally stable in molten salts, water vapor, and/or reducing atmospheres. Refractory oxides such as mullite (3Al2O3 · 2SiO2), yttria-stabilized zirconia (ZrO2-Y2O3), or alumina (Al2O3) are promising candidate coating materials because of their excellent environmental stability in these severe conditions. Refractory oxide coatings can also serve as thermal barrier coatings because of their low thermal conductivity. Key requirements for an adherent and durable barrier coating include coefficient of thermal expansion (CTE) match and chemical compatibility with the substrate. Mullite in general meets all the requirements and thus appears most promising.

Type
Corrosion and Coating
Information
MRS Bulletin , Volume 19 , Issue 10 , October 1994 , pp. 35 - 38
Copyright
Copyright © Materials Research Society 1994

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References

1.Jacobson, N.S., J. Am. Ceram. Soc. 76 (1) (1993) p. 3.CrossRefGoogle Scholar
2.Jacobson, N.S., Smialek, J.L., and Fox, D.S., Handbook of Ceramics and Composites, Volume 1, edited by Cheremisinoff, N.P. (Marcel Dekker, New York, Basel, 1990) p. 99.Google Scholar
3.Hashimoto, A., Geochim. Cosmochim. Acta 56 (1992) p. 511.CrossRefGoogle Scholar
4.Opila, E.J., ECS 1993 Fall Meeting, New Orleans (1993).Google Scholar
5.Opila, E.J. and Jacobson, N.S., Oxid. Met., submitted.Google Scholar
6.Fox, D.S., unpublished research, NASA Lewis Research Center, Cleveland, OH.Google Scholar
7.Federer, J.I., J. Mater. Eng. 12 (2) (1990) p. 141.CrossRefGoogle Scholar
8.Price, J.R., van Roode, M., and Stala, C., Key Eng. Mater. 72–74 (1992) p. 71.CrossRefGoogle Scholar
9.Lee, K.N., Miller, R.A., and Jacobson, N.S., U.S. Patent Application Serial No. 08/031,444.Google Scholar
10.Lee, K.N., Miller, R.A., and Jacobson, N.S., Ceram. Trans. 38, edited by Bansal, N.P. (1993) p. 565.Google Scholar
11.Lee, K.N., Miller, R.A., and Jacobson, N.S., J. Am. Ceram. Soc., submitted.Google Scholar
12.Butt, D.P., Mecholsky, J.J. Jr., van Roode, M., and Price, J.R., J. Am. Ceram. Soc. 73 (9) (1990) p. 2690.CrossRefGoogle Scholar
13.Takeshi, T. and Roy, R., J. Am. Ceram. Soc. 56 (12) (1973) p. 639.Google Scholar
14.Sōmiya, S. and Hirata, Y., Bull. Am. Ceram. Soc. 70 (10) (1991) p. 1624.Google Scholar
15.Lee, K.N. and Miller, R.A., Ceram. Eng. Sci. Proc., July/August (1994) p. 547.Google Scholar
16.Jacobson, N.S., Lee, K.N., and Fox, D.S., J. Am. Ceram. Soc. 75 (6) (1992) p. 1603.CrossRefGoogle Scholar
17.Opila, E.J., Fox, D.S., and Barrett, C.A., Proc. 17th Annual Conference on Composites and Advanced Ceramic Materials (American Ceramic Society, Westerville, OH, 1993) p. 367.Google Scholar
18.Kim, H.E. and Readey, D.W., in Silicon Carbide '87, edited by Cawley, J.D. and Semler, C.E. (American Ceramic Society, Westerville, OH, 1987) p. 301.Google Scholar
19.Narushima, T., Goto, T., Yokoyama, Y., Iguchi, Y., and Hirai, T., J. Am. Ceram. Soc. 76 (10) (1993) p. 2521.CrossRefGoogle Scholar
20.Jacobson, N.S., NASA Technical Paper 3162 (1992).Google Scholar
21.Barin, I., Thermochemical Properties of Inorganic Substances, Parts I and II (VCH, Weinheim, Germany, 1989).Google Scholar
22.JANAF Thermochemical Tables, 3rd ed., edited by Chase, M.W. Jr., Davies, C.A., Downey, J.R. Jr., Frurip, D.J., McDonald, R.A., and Syverud, A.N. (American Chemical Society and American Physical Society, New York, 1985).Google Scholar
23.Besmann, T.M., ORNL/TM-5775, Oak Ridge National Laboratory, April 1977.Google Scholar
24.Pettit, F.S. and Giggins, C.S., in Superalloys, edited by Sims, C.T., Stoloff, N.S., and Hagel, W.C. (Wiley & Sons, New York, 1987) p. 327.Google Scholar
25.Jacobson, N.S., Oxid. Met. 31 (1/2) (1989) p. 91.CrossRefGoogle Scholar
26.Levin, E.M., Robbins, C.R., and McMurdie, H.F., Phase Diagrams for Ceramists (American Ceramic Society, Columbus, OH, 1964) p. 501.Google Scholar
27.Jacobson, N.S., Lee, K.N., and Yoshio, T., J. Am. Ceram. Soc., in preparation.Google Scholar
28.Misra, A.K., NASA Contractor Report 4271 (1990).Google Scholar
29.Touloukian, Y.S., Kirby, R.K., Taylor, R.E., and Lee, T.Y.R., Thermophysical Properties of Matter, Volume 13 (IFI/Plenum, New York, Washington, 1977).Google Scholar
30.Nagano, T. and Wakai, F., J. Mater. Sci. 28 (1993) p. 5793.CrossRefGoogle Scholar
31.Miller, R.A., Smialek, J.L., and Garlick, R.G., Advances in Ceramics, Volume 3 (American Ceramic Society, Westerville, OH, 1981) p. 241.Google Scholar
32.Miller, R.A., Garlick, R.G., and Smialek, J.L., Am. Ceram. Soc. Bull. 62 (12) (1983) p. 1355.Google Scholar
33.Heintze, G.N. and Uematsu, S., Surf. Coatings Technol. 50 (1992) p. 213.CrossRefGoogle Scholar
34.Skogsmo, J. and Halvarsson, M., Surf. Coatings Technol. 54/55 (1992) p. 186.Google Scholar