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Interactions Between Crystalline Si3N4 and Preceramic Polymers at High Temperature

  • Joseph T. McGinn (a1), Yigal Blum (a2), Sylvia M. Johnson (a2), Michael I. Gusman (a2) and Gregory A. McDermott (a2)...

Abstract

Polymeric precursors to Si3N4 were mixed with Si3N4 powder, in various combinations, to form coatings in Si3N4 and to control microstructure of Si3N4. The microstructure of polymer-derived ceramic and preceramic materials was examined by transmission electron microscopy (TEM) after heat treatment at 900°C and 1200°C and sintering at 1650°C. The observed micro-structure suggests that the polymer-derived-material properties will approach those of conventionally formed Si3N4. With proper viscosity control, gaps between α-Si3N4 powder particles as narrow as 5 to 10 nm are filled by the polymer-derived-material, ensuring full wetting of the α-Si3N4. Voids as large as 0.3 μm between (α-Si3N4 particles are filled by the ceramic precursor, reducing the size of pores formed during subsequent sintering processes. Intimate bonding between the amorphous, polymer-derived-material and the crystalline Si3N4 grains is observed after heat treatments or sintering, a necessary condition for achieving high-quality properties similar to conventional material. Acicular grains of α-Si3N4 formed from the equiaxed β-Si3N4 powder/PCMS mixture upon sintering are also observed.

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1 Johnson, S.M., Blum, Y.D., Gusman, M., McDermott, G.A., “Preceramic Polymer-Ceramic and Metal Interfaces” (to be published in Scripta Met).
2 Laine, R.M. and Blum, Y.D., Method of Forming Compounds Having Si-N Groups and Resulting Products, International Patent Application, PCT Publication WO 86/06377 (1986); U.S. Patent 4,788,309 (29 November 1988).
3 Blum, Y.D., unpublished results.
4 Schwartz, K.B., Rowcliffe, DJ., Blum, Y.D., Adv. Ceram. Mat. 3, 320 (1988).
5 Blum, Y.D., Platz, R.M., Crawford, E.J., J. Am. Ceram. Soc. 73, 170 (1990).

Interactions Between Crystalline Si3N4 and Preceramic Polymers at High Temperature

  • Joseph T. McGinn (a1), Yigal Blum (a2), Sylvia M. Johnson (a2), Michael I. Gusman (a2) and Gregory A. McDermott (a2)...

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