Lift-off: „Keramikblech“ thrust nozzles in test flight of an unmanned aerial vehicle (UVA)

Left: thrust nozzle made of ”Keramikblech“ (ceramic sheet), middle and right side: the Jetoptera ”J55“

For the first time a component made of sheet ceramic, built into the model “J55”, takes to the skies. Edmonds / Washing­ton-based Jetoptera, Inc. devel­oped the Fluidic Propulsion System™, an innova­tive propulsion concept for an unmanned aerial vehicle. For the first time the fluidic pro­pul­sion technol­ogy was imple­mented on the airframe. A consistent devel­op­ment of fluid mechan­i­cal components, the imple­menta­tion of the latest ceramic tech­nol­ogies and innova­tive manu­fac­turing tech­niques are com­po­nents of the compact, revolutionary design.

The sheet ceramic were incor­po­rated into the thrusters of the model Jetoptera J55, due to the low density of the ceramic material, which is only 36% of the steel density, as well as its high thermal load capacity, especially devel­oped for this challenging task.

The test flight of the Jetoptera prototype on April 26 this year was a world premiere in terms of design and drive tech­nol­ogy for unmanned aerial vehicles, but also in regards of the wide range of applica­tions of the oxide ceramic fiber composite "sheet ceramic" in industry and research.

  More about: „Jetoptera“, article „Fluidic propulsion™ takes off“, Jetoptera on Linkedin 

Above: the Jetoptera "J55" during the first flight and a thermographic image of the ceramic sheet thrust nozzle in test run

“Keramikblech” flame tubes 15 years in successful use

Already 15 years ago, in 2002, flame tubes made of “Keramikblech” (sheet ceramic), were delivered for burners from the company Weishaupt for the first time. The first flame tube was installed by the large bakery Wendeln near Munich, (at that time already Kamps), in a baking line, on which the crispbread “Lieken Urkorn” was produced. This production line was sold in 2003 to Wolf Süsswaren in Arnstadt, Thuringia, where a second baking line was also equipped with flame tubes made of “Keramikblech". Both plants are still in operation. Today this industrial bakery is called “Grabower Süsswaren”.

The lifetime of metal flame tubes in 2002 was approximately 1000 hours. The durable flame tubes made of sheet ceramic are only replaced if they are mechanically damaged during maintenance. Therefore a more than 50,000 hours lifetime of “Keramikblech” flame tubes is about 50 times higher than the lifetime of metal flame tubes.

Further flame tube types for “Weishaupt burners” are mainly used in crematoria. In these applications the lifetime of 10 weeks is extended to more than 2 years.

  See also: Burner Components

Sliding carriage of the first generation after 2800 cycles:

The sliding carriage of the 1st generation, shown above, passed through 2800 cycles by now but still works with its fissures. The sliding carriage of the 2nd generation currently passed through 920 cycles.

The application temperature of these sliding carriages is between 1000 – 1140 °C. The cycle time amounts approx. 2 hours. It's loaded with test bodies, is pushed into the hot stove and pulled out again after a not known residence time.

Article of the magazine Ceramic Applications 2/2015

Further publications you can download as PDF file. 

Pipe with flange

Diameter: 230 mm, length: 3230 mm, 
(April, 2015)

Anniversary Film

Walter E.C. Pritzkow Spezialkeramik
the image film for the company anniversary, (language: German).

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