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By means of EPMA,SIMS and XTEM tech-niques,the element distribution at the transitionzone of Y-modified ion plated titanium andtitanium nitride film on A3 steel substrate and thevariation of the element content on the surface ofthe evaporation source before and after service werestudied in detail.A mode was proposed in terms ofpreferential evaporation and micro-tunnel trans-portation of Y at the interface of film/substrate. 相似文献
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本文研究了在950℃空气中,表面涂Na_2SO_4盐膜的条件下,NiAl,NiAl-20%Fe及渗铝后的高温热腐蚀行为。在热腐蚀过程中,NiAl合金表面能形成Al_2O_3膜,显示出一定的耐蚀性能。但Al_2O_3膜易开裂,Al_2O_3膜的溶解及开裂会引发合金发生快速热腐蚀;20%Fe的加入则使NiAl合金的耐蚀性能显著变差,合金表面不能形成单一的Al_2O_3膜;渗铝处理可以明显提高NiAl-20%Fe合金的耐蚀性能,且渗铝涂层的耐蚀性能优于NiAl合金,这与铝化物涂层中的Al含量较高,Al_2O_3膜的开裂倾向较小有关。 相似文献
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