Interfaces of polymeric precursors with ceramics/metals
- SRI International, Menlo Park, CA (United States)
Preceramic polymers that yield ceramic materials on heating have been investigated as precursors to fibers, binders, powders, and coatings. These materials have also been used as processing additives for ceramics, rheological control agents, and aids for controlling the microstructure of ceramics and coatings. The reactivity of the precursors with ceramic and metal powders or with substrate surfaces opens up many possibilities for improved processing of materials, fabrication of novel materials, and the preparation of materials and coatings with improved properties. Although reactions at interfaces between polymeric precursors and ceramics or metals are not yet well understood, the beneficial effects of using precursors have been demonstrated. Interfacial reactions between polymers and other materials depend on the polymer composition and rheological properties, the ceramic or metallic material composition and surface states, and the heat treatments and environments. Interfaces range from relatively simple interfaces between a pure polymer-derived material and a substrate, as reflected by the formation of coatings or the use of polymers to infiltrate porous materials, to complex interfaces between polymers, various powders, and occasionally substrates. Examples of complex interactions include the use of precursors as binders or microstructural control agents and the direct formation of bulk materials or matrix materials from polymer/powder compositions. This paper gives specific examples of the interactions of polymeric precursors with ceramics to provide controlled microstructure development during sintering of Si[sub 3]N[sub 4] (in-situ growth of elongated grains) and to form near-net-shape mullite and mullite-based coatings with unique properties.
- OSTI ID:
- 6988657
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 31:8; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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SILICON NITRIDES
MICROSTRUCTURE
SINTERING
EXPERIMENTAL DATA
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PRECURSOR
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FABRICATION
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NITROGEN COMPOUNDS
NUMERICAL DATA
PNICTIDES
SILICON COMPOUNDS
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