摘要:
针对纯陶瓷涂层由于结合强度低、孔隙率高、影响涂层耐磨性的实际,用等离子喷涂法制备了Cu-Al2O3梯度涂层,用电子扫描显微镜(SEM)、金相显微镜等手段对涂层进行微观组织和成分分析,用自制销盘式固定磨料磨损试验机,检测了Cu-Al2O3梯度涂层的耐磨料磨损性能。结果表明,采用等离子喷涂法制备的Cu-Al2O3梯度涂层无明显的组织突变和宏观层间界面,涂层的组织表现出宏观不均匀性和微观连续性分布特征;梯度涂层中当Al2O3含量(质量分数,%)达到80%时(GC6),涂层的耐磨性最高,约为基体的3倍,随着Al2O3含量继续增大,纯陶瓷涂层(GC7)的耐磨性有所下降。
Abstract:
In reflection to the fact that the low adhesion strength and high porosity affected the coatings'abradability of pure ceramic coatings, Cu-Al2O3 gradient coatings were fabricated by plasma spraying.The methods of SEM, metallurgical microscope and so on were used to analyse microstructure and component of the coatings and self-made mounting grinding abrasion probe aircraft was used to measure the wearing grinding abrasion of Cu-Al2O3 gradient coatings.The results showed that the Cu-Al2O3 gradient coatings fabricated by plasma spraying have not apparent structure-accident and macrography interlamination interface, and the structure of coatings express the features of non-homogeneous in macrography and continuous in microscopic.The abradability of coatings is highest when the content of Al2O3 in gradient coatings reaches 80%, which is triple of base body.As the content of Al2O3 continues enlarging to pure ceramic coatings, its abradability falls down.
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