电脉冲沉积铝化物及铝化物-Y_2O_3涂层

Aluminizing and Aluminizing-Y_2O_3 Coatings Deposited by Pulse Spark

采用电脉冲沉积技术在 2 0碳钢表面上获得了冶金结合的晶粒尺寸约为几十到几百纳米的铝化物和铝化物 +弥散Y2 O3复合微晶涂层。60 0℃空气中氧化 10 0h的结果表明 ,电脉冲沉积获得的两种涂层均可显著地降低 2 0碳钢的氧化速率并提高氧化层的抗剥落性能。用AFM ,SEM ,EDS和XRD对铝化物涂层及氧化层进行了分析 。

Aluminizing and aluminizing dispersed Y 2O 3 composite coatings were prepared on 20 steel specimens by pulse spark technique, which exhibited a micro crystallized structure with grain size in the range of several tens to several hundred nanometers. It is shown that after oxidation at 600 ℃ in air for 100 h, these two kinds of coatings have excellent resistance to high temperature oxidation and scale spallation, and the aluminizing dispersed Y 2O 3 composite coatings has even more better property than the aluminizing coatings. AFM, SEM, EDS and XRD were applied to analyze the surface morphology, composition and phase structure of these coatings and the oxide scale formed during oxidation. The mechanism for these coatings to enhance the oxidation resistance and scale spallation resistance was discussed by considering the factors such as Al concentration on the selective oxidation of Fe Al alloy, the effect of dispersed Y 2O 3, etc.