| 摘要 |
The fine coatings consist of TiN, ZrB2, or Cr2O3, applied to high grade ceramic parts, pref. parts contg. ca. 90% alumina. The parts are used esp. in the metallurgical industry in applications involving high thermo-mechanical stress, and erosion and corrosion at high temps., e.g. nozzles used in continuous casting, or stopper parts. The parts are pref. heated before being coated, and the coated parts are cooled slowly so no cracks occur. A pref. alternative is to coat the parts or substrates with a thin layer of Si, followed by nitriding to form Si3N4, and repeating this process. The Si powder used in this process pref. contains a catalyst, esp. iron. The coatings possess high resistance to molten metals and molten slags, so the parts have long working lives. |
