Abstract
Microstructural development and crystallization behaviour of Yb2O3-fluxed sintered silicon nitride materials was investigated using CTEM and HREM. The materials contained 5 and 10 vol% Yb2O3 as sintering additives. After densification, both compositions were subsequently heat treated to crystallize the residual amorphous secondary phases present at triple-grain regions. In the material doped with 5 vol% Yb2O3, only an amorphous secondary phase was observed after sintering, which was about 80% crystalline (Yb2Si2O7) after the post-sintering heat treatment. A metastable phase was formed in the material with 10 vol% additives after sintering, with about 70% crystallinity in the triple-point pockets. Upon postsintering heat treatment, the material could be completely crystallized. During heat treating, the metastable phase combined with the remaining glass to form Yb2SiO5 plus Yb2Si2O7 and a small amount of Si3N4 which deposited epitaxially on pre-existing Si3N4 grains in areas of low-energy within the triple-point pockets. All materials contained thin amorphous films separating the grains. The amorphous intergranular films along grain boundaries (homophase boundaries) revealed excess ytterbium and oxygen. The thickness of the intergranular films was about 1.0 and 2.5 nm for the grain boundaries and the phase boundaries, respectively, independent of additive content and heat-treatment history.
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References
C. A. Anderson andR. J. Bratton, “Ceramics Materials for High Temperature Turbines”, Final Report, ERDA, AC-05-760-90405 (1977).
F. L. Riley, “Progress in Nitrogen Ceramics”, in Proceedings of the NATO Advanced Study Institute on Nitrogen Ceramics, Brighton, 1981 (Martinus Nijhoff, 1983).
J. J. Burke, E. N. Lenoe andR. N. Katz, “Ceramics for High Performance Applications”, Vols I–III (Brook Hill, Chestnut Hill, MA, 1974, 1977, 1980).
S. Somiya, E. Kanai andK. Ando, in “Proceedings of the 1st International Symposium on Ceramic Components for Engines” edited by F. L. Riley (KTK Scientific, Tokyo, 1983).
W. Bunk andM. Böhmer, “Keramische Komponenten für Fahrzeug-Gasturbinen”, Vols I–III (Springer, Berlin, 1977, 1980, 1984).
K. Kijima andS. Shirasaki,J. Chem. Phys. 65 (1976) 2668.
C. D. Greskovich, S. Prochazka andJ. H. Rosolowki, in “Nitrogen Ceramics”, edited by F. L. Riley (Nordhoff, Leyden, 1977) pp. 351–7.
M. Mitomo, M. Tsutsumi, E. Bannai andT. Tanaka,Amer. Ceram. Soc. Bull. 55 (1976) 313.
G. R. Terwilliger andF. F. Lange, US Pat. 3992 497 (1976).
A. Giachello, P. C. Martinengo, G. Tommasini andP. Popper,J. Mater. Sci. 14 (1979) 2825.
A. Tsuge, K. Nishida andM. Komatsu,J. Amer. Ceram. Soc. 58 (1975) 323.
F. F. Lange,Amer. Ceram. Soc. Bull. 62 (1983) 1369.
G. N. Babini, A. Bellosi andP. Vincenzini,Ceram. Int. 6 (3) (1980) 91.
D. R. Clarke, F. F. Lange andG. D. Schnittgrund,J. Amer. Ceram. Soc. 65 (1982) C-51.
W. A. Sanders andD. M. Mieskowski,ibid. 64 (1985) 304.
L. A. Pierce, D. M. Mieskowski andW. A. Sanders,J. Mater. Sci. 21 (1986) 1345.
N. Hirosaki, A. Okada andK. Matoba,J. Amer. Ceram. Soc. 71 (1988) C-144.
R. W. Rice andW. J. McDonough,ibid. 58 (1975) 264.
H.-J. Kleebe, G. Wötting andG. Ziegler,Sci. Ceram. 14 (1987) 407.
L. K. L. Falk andM. Holmström, in “Euro-Ceramics 1”, edited by G. de With, R. A. Terpstra and R. Metselaar (Elsevier Applied Science, London, 1989) pp. 373–7.
J. R. Kim andC. H. Kim,J. Mater. Sci. 25 (1990) 493.
T. Ekström, L. K. L. Falk andE. M. Knutsonwedel,J. Mater. Sci. Lett. 9 (1990) 823.
G. R. Terwilliger,J. Amer. Ceram. Soc. 57 (1974) 48.
D. R. Clarke andG. Thomas,ibid. 61 (1978) 114.
R. E. Loehman andD. J. Rowcliffe,ibid. 6 (1980) 144.
R. K. Govila,J. Mater. Sci. 20 (1985) 4345.
E. Tani, M. Nishijima, H. Ichinose, K. Kishi andS. Umebayashi,Yogyo-Kyokai-Shi 94 (1986) 300.
L. K. L. Falk andG. Dunlop,J. Mater. Sci. 22 (1987) 4369.
M. K. Cinibulk, G. Thomas andS. M. Johnson,J. Amer. Ceram. Soc. 73 (1990) 1606.
D. A. Bonnell, T. Y. Tien andM. Rühle,ibid. 70 (1987) 460.
H. Schmid andM. Rühle,J. Mater. Sci. 19 (1984) 615.
D. R. Clarke,J. Amer. Ceram. Soc. 70 (1987) 15.
H.-J. Kleebe,J. Europ. Ceram. Soc. 10 (1991) 151.
D. R. Clarke,J. Amer. Ceram. Soc. 72 (1989) 1604.
R. L. Tsai andR. Raj,ibid. 63 (1980) 513.
R. Raj,J. Geophys. Rev. B 87 (1982) 4731.
E. Hampp, M. J. Hoffmann, H.-J. Kleebe, J. S. Vetrano andG. Schneider,J. Mater. Sci. (1993) submitted.
E. Hampp, J. Gröbner, M. J. Hoffmann andG. Petzow, to be published.
Z. K. Huang, P. Greil andG. Petzow,Ceram. Int. 10 (1984) 14.
W. Braue,Mater.-wiss. Werkstoff. 21 (1990) 72.
H.-J. Kleebe, W. Braue, W. Luxem andM. Rühle, in “Proceedings of 4th International Symposium on Ceramic Materials and Components for Engines”, Swedish Ceramic Society, 10–12 June 1991, Göteborg, Sweden.
H. Keßler, H.-J. Kleebe, R. W. Cannon andW. Pompe,Acta Metall. (1991) submitted.
R. Raj andF. F. Lange,Acta Metall. 29 (1981) 1993.
D. A. Bonnell,Mater. Sci. Forum 47 (1989) 132.
R. R. Wills,J. Amer. Ceram. Soc. 58 (1975) 335.
J. S. Vetrano, H.-J. Kleebe, E. Hampp, M. J. Hoffmann andR. M. Cannon,J. Mater. Sci. Lett. 11 (1992) 1249.
D. R. Clarke,Ultramicroscopy 4 (1979) 33.
J. N. Ness, W. M. Stobbs andT. F. Page,Phil. Mag. A 54 (1986) 679.
O. L. Krivanek, T. M. Shaw andG. Thomas,J. Appl. Phys. 50 (1979) 4223.
H.-J. Kleebe, J. S. Vetrano, J. Bruley andM. Rühle, in “Proceedings of 49th Annual EMSA Meeting”, 4–9 August, San Jose, edited by G. W. Bailey (San Francisco Press, 1991) p. 930.
F. F. Lange,J. Amer. Ceram. Soc. 63 (1980) 38.
J. K. Patel andD. P. Thompson,Brit. Ceram. Trans. J. 87 (1988) 70.
M. J. Hoffmann, E. Hampp, J. S. Vetrano, H.-J. Kleebe andG. Petzow, to be published.
H.-J. Kleebe andM. K. Cinibulk J. Mater. Sci. Lett. 12 (1993) 70.
L. J. Gauckler, H. Hohnke andT. Y. Tien,J. Amer. Ceram. Soc. 63 (1980) 35.
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Vetrano, J.S., Kleebe, H.J., Hampp, E. et al. Yb2O3-fluxed sintered silicon nitride. J Mater Sci 28, 3529–3538 (1993). https://doi.org/10.1007/BF01159834
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DOI: https://doi.org/10.1007/BF01159834