Mo丝网上双层Ir/W高温抗氧化涂层的制备与表征

为改善溅射依涂层与钼基体之间的结合力,在钼基体与依涂层之间制备了钨粘结层,并成功在钼丝网上制备了双层的铱/钨涂层。研究表明,钨粘结层的制备能有效改善铱涂层与钼基体之间的结合力,从而有效抑制铱涂层的剥落。对于制备态的样品,W粘结层与铱涂层以及钼基体之间未出现明显的互扩散。X射线衍射结果表明,溅射铱涂层为多晶结构且呈(111)择优取向生长。根据Movchan-Demchishin模型,所制备的双层铱/钨涂层的显微结构与“1区”结构类似,该结构表明所制备的涂层横向结合力弱,在拉应力状态下易发生开裂。

Preparation and Characterization of Ir Coating on Mo Network with a W Bond-Coat

A bi-layered Ir/W metallic coating was successfully deposited onto the Mo network via the magnetron sputtering method. The sputtering W bond-coat was proved able to enhance the binding energy between the sputtering Ir coating and the Mo substrate, and virtually neither delamination nor peeling off was observed for the as-prepared coating. In addition, the interdiffusion between the W bond-coat and the Ir coating or the Mo substrate was not apparent. The dense and adherent Ir coating was identified to have a polycrystalline structure with (111) orientation. According to the three zone model suggested by Movchan and Demchishin for sputtering metallic coatings, the microstructure of the bi-layered metallic coating was consistent with the Zone 1 features. In fact, the bi-layered coating had very low lateral strength and inclined to crack under tension.