Lift-off: „Keramikblech“ thrust nozzles in test flight of an unmanned aerial vehicle (UVA)
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.
“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.
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.
Walter E.C. Pritzkow Spezialkeramik
the image film for the company anniversary, (language: German).