【摘要】 利用磁控反应溅射的方法在Ti₃Al基合金表面制备了两种不同铝含量的Cr_0.82Al_0.18N与Cr_0.53Al_0.47N涂层,测试了这两种涂层在800℃（Na₂SO₄+25 mass%K₂SO₄）熔融盐膜下的热腐蚀动力学,并采用X射线衍射仪和带能谱的扫描电镜分析腐蚀产物相组成以及微观结构。结果表明,两种涂层均可降低Ti₃Al基合金的热腐蚀速率;涂层热腐蚀产物主要为具有保护性的Cr₂O₃和θ-Al₂O₃混合氧化膜,θ-Al₂O₃的含量随着涂层中Al含量上升递增;和θ-Al₂O₃相比,Cr₂O₃在熔融硫酸盐中的稳定性更好,Cr_0.82Al_0.18N涂层抗热腐蚀性能优于Cr_0.53Al_0.47N涂层。更多还原

【Abstract】 Cr_0.82Al_0.18N and Cr_0.53Al_0.47N coatings were deposited on a Ti₃Al based alloy by reactive magnetron sputtering method.Hot corrosion of these two coatings in 75 mass%Na₂SO₄+25 mass%K₂SO₄ molten salt at 800℃was performed in a Setsys 16/18 thermoanalyzer.The phase compositions of the corrosion products were identified by X-ray diffractometer（XRD）.Both the surface and cross-sectional morphologies of the samples were observed by a scanning electron microscope（SEM）.The results showed that both Cr_0.82Al_0.18N and Cr_0.53Al_0.47N can reduce the hot corrosion rate of the Ti₃Al based alloy and their hot corrosion resistance decreases with increasing aluminum content;the main corrosion products of the coatings are Cr₂O₃ andθ-Al₂O₃ and the amount ofθ-Al₂O₃ in the corrosion products is proportional to the Al content in the coating.The better hot corrosion resistance of Cr_0.82Al_0.18N coating can attribute to the high stability of Cr₂O₃ in the molten salt.更多还原