Ceramics - Processing, Reliability, Tribology and Wear,

This day the advance of technical ceramics is usually orientated in the direction of a greater regulate of the microstructure and ensuing homes of those fabrics. New kinds of powders and microstructures are built to allow the use of ceramics in new software areas.
This aim will be reached through generating safely reproducible reactive powders, improvement of tailored sintering strategies, and via introducing new kinds of composites. furthermore, new equipment supply new possibilities for fabrics improvement.

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After sintering the support the membrane layer is prepared by dip-coating of the inner channels. The steps dipcoating, drying and sintering are repeated several times if more than one membrane layer is necessary or if the membrane shows defects after sintering. Flat membranes represent another type of ceramic membranes. The support of the flat membrane is prepared by tape casting, slip casting or calendering [2]. After the sintering of the support the membrane layer is made by the same procedure as described above (dip-coating, drying, sintering).

The reasons for this improvement are not entirely clear as yet. One mechanism discussed is the dissolution of zirconia in the melt accompanied by an increase of the viscosity, which reduces flow-, creepand diffusion-based corrosion mechanisms. From the result of this paper it can be concluded that the dissolution of the zirconia leads to a higher γ as well. Due to this fact, a higher amount of grain boundaries are protected against infiltration by non-wetting. Future research will focus on the selection of other phases that can be added to refractories having a stronger influence on the solid-liquid interface energy.

Pores were clearly seen on grain boundaries for all samples. The detected gases are likely to be released mainly from such pores accompanying intergranular fracture. Figure 6 illustrates the total amount of emitted gas (N) calculated from the pressure change of the chamber at the time of fracture for all samples. Analysis with the mass spectrometer confirmed that O2 and Ar were the predominant gases emitted from the specimens sintered in O2 and Ar, respectively. In the case of sintering in vacuum, only adsorbants such as H2 were found.

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