TiC及Ag、Si结构改性的TiAlN涂层摩擦性能研究

发布时间：2018-05-13 05:18

  本文选题：TiC涂层 + Ag、Si结构改性TiAlN涂层　； 参考：《南昌航空大学》2017年硕士论文

【摘要】：当前,对于涂层摩擦学性能的实验室研究大都在恒温条件下进行,但在实际的工况中,涂层的温度是逐渐变化的。因此,对于应用和研究较广泛的TiAlN和TiAlSiN涂层,本文选用Al2O3为对磨材料,在对其室温(RT)、300oC、600oC恒温摩擦学性能研究的基础上,研究其在RT-600oC和600oC-300oC变温环境的摩擦学性能。并且制备了TiC/TiAlN-Ag、TiC/TiAlN-Ag/Ti AlSiN多层复合膜,研究多层复合涂层在恒温及变温环境的摩擦学性能。(1)采用电弧离子镀技术在Ar/CH4气氛中AISI304不锈钢表面制备Ti-C涂层,研究了CH4流量对涂层结构和摩擦学性能的影响。发现随着CH4流量的升高,涂层沉积速率下降。当CH4流量为2sccm和10sccm时,C原子主要作为间隙原子固溶在密排六方Ti晶格内;当CH4流量为20sccm时,涂层的主要结构为TiC相。CH4流量为2sccm时,涂层硬度值为700Hv0.05,摩擦系数值波动较大,磨损机理主要为粘着磨损。CH4流量为20sccm时,涂层硬度值最高,为2010Hv0.05,摩擦系数值最低,而且较平稳,约为0.57,磨损机理主要为磨粒磨损。(2)采用电弧离子镀技术制备TiAlN和TiAlSiN涂层,采用磁控溅射技术制备TiAlN-Ag涂层。在300oC和RT-600oC环境中,空气湿度相对较低,吸附在涂层与摩擦副之间的水膜被破坏,导致涂层磨损剧烈,磨损机理以粘着磨损和疲劳断裂为主。其中,TiAlN涂层摩擦系数值较高(大于1),波动较大,磨损率分别为0.21×10-3mm3/(Nm)和0.17×10-3mm3/(Nm),TiAlSiN和TiAlN-Ag涂层也均已磨穿或接近磨穿。600oC和600oC-300oC的环境中,涂层的表面大都生成了氧化物,起到了较好的润滑效果。TiAlN-Ag涂层在室温条件下摩擦系数值较高,较TiAlN涂层耐磨性下降,磨损机理主要为粘着磨损。(3)采用电弧离子镀和磁控溅射交替沉积技术,分别制备TiC/TiAlN-Ag和TiC/TiAlN-Ag/TiAlSiN多层复合膜。TiC/TiAlN-Ag多层膜的调制周期约为0.46μm,TiC、TiAlN-Ag厚度比为3:2;Ti C/TiAlN-Ag/Ti AlSiN多层膜的调制周期约为0.45μm,TiC、TiAlN-Ag、TiAlSiN厚度比约为3:2:2。涂层的表面质量较TiC涂层有较大改善。两者的主要结构为TiC相和TiAlN相,硬度值分别为1141.5Hv0.05和2194.7Hv0.05。TiC/TiAlN-Ag复合膜在600oC条件下,发生了较严重的氧化,导致机械性能降低,涂层发生了严重的塑形位移,磨损率较大,为0.158×10-3mm3/(Nm),在300oC和RT-600oC条件下,涂层被磨穿。TiC/TiAlN-Ag/TiAlSiN多层复合膜在600oC条件下的抗氧化性增强,在Al2O3球磨痕表面形成了Ag转移膜,摩擦系数约为1.1,磨损率约为0.06×10-3mm3/(Nm)。在300oC和RT-600oC的条件下,摩擦学性能较单层膜有较大改善,摩擦系数约为0.8,磨损机理主要为磨粒磨损,磨损率分别为0.15×10-3mm3/(Nm)和0.13×10-3mm3/(Nm),其原因为多层结构阻止了疲劳裂纹的纵向生长。但是涂层在室温条件下,耐磨性较差,有可能是因为涂层内部较大的残余内应力。
[Abstract]:At present, most of the laboratory researches on the tribological properties of the coatings are carried out under the condition of constant temperature, but the temperature of the coating changes gradually in the actual working conditions. Therefore, for the widely used and studied TiAlN and TiAlSiN coatings, the tribological properties of Al2O3 are studied in RT-600oC and 600oC-300oC environments on the basis of the tribological properties of 300oC and 600oC at room temperature. TiC / TiAlN-AgN / TiC- / TiAlN-AgTi AlSiN multilayer composite films were prepared. The tribological properties of the multilayer composite coatings in constant and variable temperature environments were investigated. The Ti-C coating was prepared on the surface of AISI304 stainless steel in Ar/CH4 atmosphere by arc ion plating. The effect of CH4 flow rate on the structure and tribological properties of the coating was studied. It is found that the deposition rate decreases with the increase of CH4 flow rate. When the flow rate of CH4 is 2sccm and 10sccm, the C atoms are mainly dissolved as interstitial atoms in hexagonal Ti lattice, and when the flow rate of CH4 is 20sccm, the main structure of the coating is TiC phase. Ch 4 flow rate is 2sccm, the hardness of the coating is 700Hv 0.05, and the friction coefficient fluctuates greatly. The wear mechanism is mainly adhesive wear. Ch _ 4 flow rate is 20sccm, the hardness of the coating is the highest (2010 Hv 0.05), the friction coefficient is the lowest, and the friction coefficient is relatively stable, about 0.57.The wear mechanism is mainly abrasive wear. 2) TiAlN and TiAlSiN coatings are prepared by arc ion plating. TiAlN-Ag coatings were prepared by magnetron sputtering. In the environment of 300oC and RT-600oC, the air humidity is relatively low and the water film adsorbed between the coating and the friction pair is destroyed, which leads to severe wear of the coating. The wear mechanism is mainly adhesive wear and fatigue fracture. The friction coefficient of TiAlN coating is higher (> 1 ~ (-1), fluctuating, the wear rate is 0.21 脳 10 ~ (-3) mm ~ (-3) / N ~ (-1) and 0.17 脳 10 ~ (-3) mm ~ (-3) / N ~ (-1) TiAlN-Ag coating has also been worn through or nearly worn through the environment of .600oC and 600oC-300oC, the surface of the coating has mostly produced oxide. The friction coefficient of TiAlN-Ag coating is higher at room temperature, and the wear resistance of TiAlN-Ag coating is lower than that of TiAlN coating. The wear mechanism of TiAlN-Ag coating is mainly adhesive wear. The modulation period of TiC/TiAlN-Ag and TiC/TiAlN-Ag/TiAlSiN multilayers. TiC- / TiAlN-Ag multilayers is about 0.46 渭 m TiCU TiAlN-Ag thickness ratio is 3: 2 Ti C/TiAlN-Ag/Ti AlSiN multilayer films, the modulation period is about 0.45 渭 m TiCU TiAlN-AgN TiAlSiN thickness ratio is about 3: 2: 2. The surface quality of the coating is better than that of TiC coating. The main structures of the two films are TiC phase and TiAlN phase. The hardness values of 1141.5Hv0.05 and 2194.7Hv0.05.TiC/TiAlN-Ag composite films are 1141.5Hv0.05 and 2194.7Hv0.05.TiC/TiAlN-Ag, respectively. Under the condition of 600oC, more serious oxidation occurs, which leads to the decrease of mechanical properties, the serious plastic displacement of the coating, and the higher wear rate. Under 300oC and RT-600oC conditions, the oxidation resistance of TiAlN-Ag- TiAlSiN multilayer composite film was enhanced under 600oC condition, and Ag transfer film was formed on the surface of Al2O3 ball wear mark. The friction coefficient was about 1.1 and the wear rate was 0.06 脳 10 ~ (-3) mm ~ (-3) mm ~ (-1). Under the conditions of 300oC and RT-600oC, the tribological properties of the films are much improved, the friction coefficient is about 0.8. The wear mechanism is mainly abrasive wear, with wear rates of 0.15 脳 10 ~ (-3) mm ~ (-3) Nm) and 0.13 脳 10 ~ (-3) mm ~ (-3) N _ (m), respectively. The reason is that the multilayer structure prevents the longitudinal growth of fatigue cracks. However, the wear resistance of the coating is poor at room temperature, which may be due to the large residual stress inside the coating.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4

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