| Abstract: |
One of the largest serial productions with cold spraying technology is coating ferritic chromium steel onto the bottom of cookware. This allows making cookware induction capable, which is not the case for e.g. aluminum or copper material. This technology was further developed by obz in recent years. Based on a patent applied technology, obz uses different kind of materials to adjust the Curie Temperature, which influences for example the maximum reachable temperature on an induction oven. This is important especially for PTFE coated cookware, that can degenerate by temperatures >280°C and finally losing its anti-adhesion characteristics. But not only maximum temperature can be limited; the technology was also developed towards influencing the uniformity of the heat distribution on the cooking area. This aspect can hardly be reached even by using a thick bottom, which moreover wasting material and making the cookware heavy. Such a coating that uniformly distributes the heat is very useful, e.g. when imagining caramelizing sugar or baking pancakes. Thus, the Curie temperature adjusted induction coatings bring customers great added values, compared to the state of the art induction cookware with ferritic chromium steel. In this contribution, the background of this technology will be presented and it will be shown, that these effects can barely be reached with any other than coating technology. The reason is that two or more materials with different Curie temperatures need to be used within a single coating. This leads to switching on and off the microscopic areas, represented through the single spray particles of different materials, depending on their Curie temperature. Finally, this results in a uniform heat distribution and temperature limitation over the complete bottom of the cookware. Furthermore, such coatings can be used in other fields of application, which will be explained.
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