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Interactions Between Crystalline Si3N4 and Preceramic Polymers at High Temperature

Published online by Cambridge University Press:  21 February 2011

Joseph T. McGinn ,
Yigal Blum ,
Sylvia M. Johnson ,
Michael I. Gusman  and
Gregory A. McDermott
Joseph T. McGinn
Affiliation:
David Sarnoff Research Center, CN5300, Princeton, NJ 08540-5300
Yigal Blum
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Sylvia M. Johnson
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Michael I. Gusman
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Gregory A. McDermott
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 409
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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