工艺参数对TC11钛合金表面电火花沉积TiN涂层显微组织和磨损性能的影响（英文）

发布时间：2018-11-26 09:02

【摘要】：系统研究了工艺参数(放电电压x,氮气流量l和比强化时间s)对电火花沉积TiN涂层显微组织和耐磨性能的影响规律。以涂层厚度(TOC)、TiN含量(CON)和孔隙率(POC)来表征涂层显微组织。建立了一个数学模型来确定对涂层显微组织和耐磨性能影响最显著的参数。结果表明:放电电压x和氮气流量l对大多数指标都有较大影响,比如涂层厚度、摩擦因数(COF)和磨损失重(I_d),而比强化时间s对孔隙率影响较大,对其他指标影响不显著。试验得到最佳工艺参数为:放电电压60 V,氮气流量15 L/min和比强化时间3 min/cm~2。由于涂层磨损机制的变化,涂层磨损失重随放电电压和氮气流量的变化而变化。在最佳工艺参数下,TiN涂层的主要磨损机理为微观切削磨损伴随轻微断裂磨损。
[Abstract]:The effects of process parameters (discharge voltage x, nitrogen flow rate l and specific hardening time s) on microstructure and wear resistance of TiN coatings deposited by EDM were studied systematically. The coating microstructure was characterized by coating thickness (TOC), TiN content (CON) and porosity (POC). A mathematical model was established to determine the most significant effect on the microstructure and wear resistance of the coating. The results show that discharge voltage x and nitrogen flow rate l have great influence on most of the parameters, such as coating thickness, friction coefficient (COF) and wear weight loss (I / D), while specific strengthening time s has a great effect on porosity. The effect on other indicators is not significant. The optimum process parameters are as follows: discharge voltage 60V, nitrogen flow rate 15 L/min and specific strengthening time 3 min/cm~2.. Due to the change of the wear mechanism of the coating, the weight loss of the coating varies with the discharge voltage and nitrogen flow rate. Under the optimum process parameters, the main wear mechanism of TiN coating is micro-cutting wear accompanied by slight fracture wear.
【作者单位】：解放军理工大学野战工程学院;
【分类号】：TG174.4

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