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Deposition process of slurry iron aluminide coatings

机译：铝浆铁涂层的沉积工艺

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摘要

Diffusion iron aluminide coatings prevent steam oxidation of ferritic/austenitic steels at 650 deg C for at least 45,000 h. These coatings are deposited by applying Al slurries followed by a diffusion heat treatment at 650 deg C. The quality of the coatings is very sensitive to a number of factors such as surface preparation, slurry composition and diffusion treatment temperature. A study of the effect of the different processing parameters has been performed in order to optimize the process from an industrial perspective. Moreover, most commercially available Al slurries contain different levels of Cr~(6+) , a highly carcinogenic species, and therefore Cr~(6+) free slurry formulations have been prepared. In addition, re-coating after exposure has also been developed since it is not clear yet if these coatings will last the 100,000 h which is the life limit for steam power plant design. Based on these studies, processes suitable for coating real size components and re-coating steam exposed components have been developed and are presented in this contribution.
机译：扩散铁铝化物涂层可防止铁素体/奥氏体钢在650摄氏度下蒸汽氧化至少45,000小时。这些涂层是通过施加Al浆料然后在650摄氏度下进行扩散热处理而沉积的。涂层的质量对许多因素（例如表面处理，浆料组成和扩散处理温度）非常敏感。为了从工业角度优化工艺，已经进行了对不同工艺参数的影响的研究。而且，大多数可商购的Al浆料包含不同含量的高度致癌物质Cr_（6+），因此已经制备了不含Cr〜（6+）的浆料配方。另外，由于尚不清楚这些涂层是否能持续100,000小时（这是蒸汽发电厂设计的寿命极限），因此还开发了暴露后重新涂层。基于这些研究，已经开发了适用于涂覆实际尺寸部件和重新涂覆暴露于蒸汽中的部件的工艺，并对此做出了贡献。

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