Ceramtec Gmbh

Forschungszentrum Karlsruhe Gmbh

Karlsruher Institut Fur Technologie

Festo Ag & Co. Kg

Stefan Stolz

Alfred Thimm

Joachim Binder

Claus Peter Kluge

Jürgen Hausselt

Hans-Joachim Ritzhaupt-Kleissl

Jürgen Ruska

Nadja Schlechtriemen

Johannes Ernst

The invention relates to an anode and electrolyte and cathode in direct material contact in fuel cell applications, so that the anode and electrolyte, and the cathode and electrolyte, particularly at temperatures &#x3e;400&#xb0; C., can react in a solid chemical manner. Said reaction results in that the material of the anodes can diffuse into the electrolyte and vice versa, and the material of the cathodes can diffuse into the electrolyte or vice versa. The effect thereof is the modification of the electrical energy yield of the fuel cells. In order to prevent said effect, it is proposed according to the invention that a blocking layer is disposed between the electrolyte and anode and electrolyte and cathode and is made of areas having opened and closed pores and that the functional penetration paths for the diffusion are formed by the frame structure thus created.

Blocking layer

A non-conductive ceramic material contains a base ceramic material and at least one other ceramic material having a lower coefficient of thermal expansion than that of the base material so that the coefficient of thermal expansion of the non-conductive ceramic material is identical to that of a metallic material to which it will be matched. Methods of making and using same are disclosed.

Ceramic material with a composition which is matched to a coefficient of thermal expansion specified by a metallic material

In dental ceramics containing zirconium dioxide and silicon-dioxide with a Zr/Si ratio of between 0.5 and 1.0, 1 to 12 wt % of aluminum oxide and up to 2 wt % of an alkali- or earth alkali metal oxide, those materials are selectively mixed with yttrium-stabilized zirconium dioxide with a Zr/Si ratio of the mixture being between 0.5 and 1 wt % and also a silicon organic compound as well as a compression aid, and a green body is formed from the mixture by milling, which green body is then sintered.

Dental ceramics and method for the manufacture thereof

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Waldershof, Germany

Stefan Stolz