【摘要】 针对火炮身管在服役过程中发生的内膛氧化现象,利用电火花沉积技术在炮钢表面沉积NiCrAlY涂层,研究NiCrAlY涂层在900℃空气中的氧化行为。采用不连续称重法测定涂层的氧化动力学曲线,利用SEM/EDS、XRD表征涂层氧化前后的微观形貌、成分与相组成。结果表明:涂层由Al₃Ni₂和γ-Ni组成,与基体形成牢固的冶金结合;涂层在900℃空气中氧化100h的动力学曲线符合抛物线规律,氧化100h增重仅为0.946 mg/cm²,极大地提高了CrNi3MoVA钢基体的高温抗氧化性能;经900℃空气氧化100h后,涂层表面形成连续、致密、粘附性良好的θ-Al₂O₃和α-Al₂O₃氧化膜。更多还原

【Abstract】 Aiming at the oxidation in the serve of gun bore,a NiCrAlY coating was prepared on the gun steel substrate by means of electrospark deposition technology,and its oxidation behavior was investigated at 900℃ in air. The discontinuous weighing method was applied to test the oxidation kinetics curves of the coating,and the microstructure,composition and phase constitution of the coating were characterized by utilizing the SEM/EDS,XRD before and after oxidation. The results show that the coating is composed of Al₃Ni₂ and γ-Ni,and forms a strong metallurgical bonding with the substrate; the oxidation kinetics curve of the coating at 900℃ in air agrees with the parabola law and its weight gain was only 0. 946 mg/cm² after oxidation for 100 h,and it greatly increases the high-temperature oxidation resistance of the substrate; a continuous,dense and good adherent scale of θ-Al₂O₃ and α-Al₂O₃ forms on the coating surface after oxidation at 900℃ in air for 100 h.更多还原