Author:
McGinn Joseph T.,Blum Yigal,Johnson Sylvia M.,Gusman Michael I.,McDermott Gregory A.
Abstract
ABSTRACTPolymeric 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.
Publisher
Springer Science and Business Media LLC
Reference5 articles.
1. Microstructural Development in Si3N4/Polysilazane Bodies During Heating
2. 1 Johnson S.M. , Blum Y.D. , Gusman M. , McDermott G.A. , “Preceramic Polymer-Ceramic and Metal Interfaces” (to be published in Scripta Met).
3. Glass Strengthening by Polymer-Derived Ceramic Coatings
4. 3 Blum Y.D. , unpublished results.
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