摘要
为提高高温合金材料抗高温氧化性能,利用真空阴极电弧离子镀在DZ22B高温合金上沉积Ni Cr Al Y涂层,研究涂层的抗高温氧化性能。采用扫描电镜观察膜层表面和截面形貌,化学容量法测试膜层成分,X射线衍射仪分析涂层的物相组成,万能试验机检测涂层结合力。结果表明:所制备的Ni Cr Al Y涂层厚度约50μm,涂层致密且与基体结合良好;涂层成份除Al元素有所损失外基本与靶材一致。Ni Cr Al Y涂层主要相为γ′-Ni3Al/γ-Ni,同时含有少量的β-Ni Al相。在1050℃高温下,Ni Cr Al Y涂层表面形成致密的氧化铝层有助于减缓氧化速度,对基材起到良好的保护作用;涂层失效的主要方式是随着氧化的进展,氧化层产生裂纹并剥落,新的表面被氧化,剥落和被氧化往复进行,直至涂层失效。
In order to improve the high temperature oxidation resistance of superalloy, Ni CrAlY coatings were deposited on DZ22 B superalloy by cathode arc ion plating. Scanning electron microscopy was used to observe the surface and cross-section morphology of the coatings. The volumetric analysis was applied to test the composition of the coating, X-ray diffraction was used to analyze the phase composition of the coating, and adhesion of the coatings was measured by universal testing machine. The results show that the thickness of Ni CrAlY coating is about 50 μm, and the coating is compact and well bonded with the substrate. The composition of the coating is basically the same with target except for the small loss of Al. The main phase of Ni CrAlY coating is γ′-Ni3 Al/γ-Ni, with a small amount of β-NiAl phase. During the high temperature oxidation process, a dense Al2 O3 layer was quickly formed on the surface of Ni CrAlY coating, therefore provide good oxidation resistance protection for substrate at 1050 ℃. The failure of the coating should be caused by the continuous growth of cracks in oxide layer and finally exfoliation, resulting in the consumption of antioxidant element.
作者
谭飞
林松盛
石倩
代明江
杜伟
汪云程
吕亮
TAN Fei;LIN Song-sheng;SHI Qian;DAI Ming-jiang;DU Wei;WANG Yun-cheng;LV Liang(Aecc South Industry Company Limited,Zhuzhou 412000,China;Guangdong Institute of New Materials,National Engineering Laboratory of Modern Materials Surface Engineering Technology,Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology,Guangzhou 510651,China)
出处
《真空》
CAS
2020年第5期7-10,共4页
Vacuum
基金
广东省自然科学基金研究团队项目(2016A030312015)
广东省科学院科技提升项目(2018GDASCX-0402)。
