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For a long time, the production of ceramic coatings can only be achieved by sintering at temperatures above 1000 degrees Celsius. However, the latest spraying process, powder aerosol deposition (PAD), allows ceramic coatings to be successfully generated even at room temperature. Currently, engineering scientists at Bellett University are working on the application of the technology under the guidance of Dr. Ralph Moos, and the results have been published in the journal Advanced Materials
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is known to produce dense ceramic films on many types of materials, such as steel, glass, silicon and even plastics, using PAD technology. The process is to first convert the dried ceramic powder into aerosols, a mixture of gas and solid particles, with the help of airborne gas, which is then transported to the vacuum chamber, accelerated through the nozzle to several hundred meters per second, and finally sprayed directly into the coated material.
the ceramic coating on Ferrari
under the impact force, ceramic particles will break and produce fragments only a few nanometers in size, the surface activity is very high, and eventually form a thickness of 1 to 100 microns coating. Due to its dense microstructure, the coating can still exhibit excellent electrolytic properties, hardness and good chemical resistance after deposition.
without further action, however, certain functional properties of the coating, such as conductivity, can be affected because the strong impact of ceramic particles on the material can lead to structural defects. But this part of the defect can be eliminated through heat reprocessing, or so-called backfire.
we have shown that the temperature required for this process is much lower than conventional sintering, which is why PAD is so attractive," concluded Dr.-Ing.JörgExner, a researcher who helped develop the study. It has very high industrial potential, especially where high-quality ceramic coatings are required. "The process has considerable application prospects in many areas, such as dielectric ceramics in capacitors, conductive functional ceramics in sensors, radon stable zirconium oxide in high-temperature fuel cells, and even lithium-ion batteries can be produced in this way.
source: uni-bayreuth.de
powder circle Coco compilation
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