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

来源期刊:中国有色金属学报(英文版)2017年第8期

论文作者:洪翔 冯柯 谭业发 王小龙 谭华

文章页码:1767 - 1776

关键词:电火花沉积;氮化钛;涂层;耐磨性能;统计模型;工艺参数

Key words:electrospark deposition (ESD); TiN; coating; wear resistance; statistical model; process parameters

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(Id),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/cm2。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: In the present study, the effects of process parameters (output voltage x, nitrogen flux l and specific strengthening time s) on the microstructure and wear resistance properties of TiN coatings prepared by electrospark deposition (ESD) were investigated systematically. The microstructure of the coatings was characterized for thickness (TOC), content of TiN (CON) and porosity (POC). A statistical model was developed to identify the significant factors affecting the microstructure and wear resistance of the coatings. The results show that the output voltage x and nitrogen flux l present significant effects on majority of the evaluation indexes such as TOC, friction coefficient (COF) and wear mass loss (Id), while the specific strengthening time s has a significant effect on POC and a small effect on the other indexes. The optimal process parameters were obtained as follows: output voltage (x, 60 V), nitrogen flux (l, 15 L/min) and specific strengthening time (s, 3 min/cm2). The variation of wear mass loss (Id) by the variation of the output voltage (x) and nitrogen flux (l) is attributed to the change of wear mechanisms of TiN coatings. The main wear mechanism of TiN coating prepared under optimal process parameters is micro-cutting wear accompanied by micro-fracture wear.

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