Fabrication ceramic materials, joining

As is the case with ceramic sintering, joining, and powder synthesis, microwave-assisted fabrication of ceramic coatings can offer unique benefits. To expose the material surfaces for reaction with a gas phase, fibers or powder particles may be suspended by the flow of gas in the fluidized bed. In addition to the flow of the fluidizing gas, low frequency mechanical vibrations (for example, 10-15 Hz) may be applied to the container to reduce the tendency for the powders or fibers to sinter together to form clumps. As the powder size decreases, the powder s sinterability increases. While vibration may not be necessary for particles as large as, say, 50 pm, it may be beneficial for powder particles that are a few microns in diameter. 

Successful applications of ceramic materials in many structures and components need some types of ceramic-metal joining. Two main factors derive the need for the development of joining techniques (1) the difficulty to fabricate large ceramic structures with complex shapes (2) the requirement of ceramic only in one part of a structure. For the practical applications, it will be necessary to join the ceramic to either another ceramic, or to a metal. The development of feasible joining techniques will facilitate the adaptation of advanced ceramics into complex and multifunctional structures. 

High, Si steel fabrication issues Coated materials (Pt) cost issue Ceramics promising, but have fabrication and joining issues Dry wall boiler design with ceramics may be option Data needed with iodine contamination Incoloy 800HT may address intergranular corrosion C—SiC composites should be examined... 

Because different materials are joined in composites, there are a large number of possible combinations. Metal, ceramic, or polymer matrix composites can be strengthened with different kinds of particles or fibres. Composites may be classified either by the geometry of the strengthening particles (fibres, fabrics, etc.) or by the matrix material used. 

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