应用热喷涂技术制备的海绵钛还原蒸馏反应器外表面金属基防护涂层由高Cr合金底层和Al - Si合金面层组成.在海绵钛生产使用条件下,在金属基防护涂层之中以及涂层与基体金属之间发生合金元素的扩散,原位生成氧化铬,从而提高了涂层与基体金属的结合强度；涂层中的氧化铬与涂层表面的氧化铝共同作用,有效地减缓了高温氧化的发展,为反应器的钢铁基体提供有效的抗氧化防护.经过13个炉次生产过程的现场试验结果表明,金属基防护涂层对反应器的钢铁基体提供了非常有效的高温保护.%Metal-basted protective coatings for the protection of reduction distillation reactor during manufacturing titanium sponge were fabricated by an arc spraying process. The coatings consist of an underlying high-Cr alloy and Al-Si alloy surface layer. The results show that, at the operating temperature of the titanium sponge production, the inter-diffusion of alloying elements within the protective coatings occurs, while the elements, Cr and Al, also diffuse to the core of the base metal. As the heating time is prolonged, a large number of chromium oxides are generated in situ within the protective coatings, especially close to the coating/substrate interface. The oxides generated increase the bond strength of the coating to the steel substrate, and together with the surface alumina they provide a long - term effective anti-oxidant protection to the steel substrate. After 13 furnace production processes of the field test results show that the metal-based protective coatings provide an effective protection to the reactor for thirteen heats.
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