【摘要】 硬质涂层具有耐磨性好,接触疲劳寿命高的优点,广泛应用于航天航空领域。然而在重载工况下,涂层基底的界面处可能会发生脱层失效,影响机械零件的可靠性。近年来涂层失效机理及增强涂层结合能力的研究逐渐受到关注。采用内聚力的理论模型,结合有限元模拟的方法,对涂层基体的界面分层失效行为进行分析。研究结果表明,基于内聚力理论模型的仿真分析结果与试验结果对比吻合程度高。在此基础上,讨论了不同因素对涂层结合能力大小的影响。增加涂层厚度和提高涂层弹性模量均可以提高界面的结合能力,增加零件的承载范围。更多还原

【Abstract】 Hard coatings has the advantages of good wear resistance and high contact fatigue life which has been widely used in aerospace and aviation fields. However, the coating/subtrate interference will occur delamination failure under the heavy load, and the reliability of machine parts has been affected. Recently, study on the coatings failure mechanisms and the bonding ability of coatings is greatly focused on. The article adopting cohesive zone model combined with FEM analysis the delamination failure of the coating/subtrate interference. The results show that the simulation results based on the cohesive zone model coincides with the experimen results. On this foundation, the effects of different factors on the adhesion strength of coatings are studied. The bonding strength of coatings has been greatly increased by increasing the thickness and elastic modulus of coatings, and the carrying capacity has greatly improved.更多还原