Hoechst Ceramtec Aktiengesellschaft

Hoechst Aktiengesellschaft

Varta Batterie Aktiengesellschaft

Heinrich Schelter

Stefan Schindler

Axel Krauth

Ulrich Von Alpen

Rudolf Ganz

Otto Heinz

Juergen Heinrich

Rudiger Herrmann

Mario Ciccarelli

In the finned-tube heat exchanger of silicon-infiltrated silicon carbide, in which the tubes of a tube bundle, with the cooling medium flowing around the tubes, are arranged mutually parallel in a housing provided with an inlet and outlet for the cooling medium, the tubes of the tube bundle are joined to one another by fins. The fins have apertures and are arranged transversely to the tube bundle.

Finned-tube heat exchanger

In a process for producing ceramic sliding bodies containing hollow chambers from a green solid parent body and a green film body containing hollow chambers, the green film body and the green solid parent body are laminated together, the organic constituents are removed by heating from the green body so obtained or the organic constituents are carbonized. Subsequently, the body is fired or siliconized. According to the invention, the green solid parent body is produced from the ceramic green material of the film body, in particular from film residues which are produced in producing the green film body containing hollow chambers. The film residues may be comminuted to form a powder in a mill.

Process for producing sliding bodies containing hollow chambers

In a heat exchanger module of fired ceramic material produced from a stack of punched and laminated green ceramic cards, the stack comprises at least two cards. The cards have first cut-outs (1) which, in stacked cards, form tubular channels (12) and second cut-outs (2, 4, 7, 8) which are positioned around the first cut-outs (1) and which, in stacked cards, partially overlap with the second cut-outs (2, 4, 7) of adjacent cards. Channels (13) which lie in the plane of the cards and surround the tubular channels (12) are thus formed.

Heat exchanger module of fired ceramic material

Process and apparatus for manufacturing heat exchangers from ceramic sheets, wherein different flow channels are stamped from or pressed into the sheets, and the formed sheets are joined together with a laminating agent. The stacking of the individual sheets is effected using apparatus in which the sheets are transported to the forming means, applicator means and laminating means by horizontally and vertically displaceable, rotatable and pivotable suction plates. The organic component of the ceramic sheets is expelled from the heat exchanger block obtained in two heating steps with an intermediate forming operation to bring the heat exchanger block to its final dimensions, and the block then fired between 1,200.degree. to 1,700.degree. C. The actual sintering temperature depends on the particular ceramic used, which may comprise Si.sub.3 N.sub.4, SiC, cordierite and/or semiconductive barium titanate compounds.

Process for manufacturing heat exchangers from ceramic sheets

By use of new ion conducting but non-electron conducting mixed crystal compounds of the type sodium zirconium phosphatosilicate as the ceramic board material for electronic circuitry it is possible to provide full integration of electronic, electro-chemical and optical components, because the boards simultaneously constitute the solid electrolyte for the miniaturized batteries serving as energy source, and for an electrochromic display system. An illustrative practical embodiment involves housing within a ceramic multi-layer structure a battery with positive electrode and negative electrode for a quartz driving circuit and an electrochromic (ECD) display controlled by an microprocessor. For the flow of current through the ECD there is used a secondary element formed of a WO.sub.3 electrode and a Na-tungstenate electrode as the counter electrode, the WO.sub.3 segments assuming a blue color due to diffusion of Na.sup.+ ions.

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Selb, Germany

Heinrich Schelter