Generally, "springs" are almost always made of metal, however, as a result of conducting research and development with a view to making springs from ceramics, NHK Spring, the world's leading spring manufacturer, has succeeded in making ceramic springs. The features of these springs are that they can be used at high temperatures (700°C to 1,000°C), they do not rust, and they are not magnetic. Currently, they are used in certain types of fuel cells and furnaces for manufacturing semiconductors, but we anticipate that many more applications will emerge. Imagine where such springs could be used. Perhaps your idea will be adopted!
