AlCrN复合刀具涂层的制备及切削性能研究(附答辩)

AlCrN复合刀具涂层的制备及切削性能研究(附答辩)(任务书,开题报告,中期检查表,外文翻译,论文说明书15000字,答辩PPT,答辩记录表)
摘  要 本文利用多弧离子镀技术在钨钢表面沉积AlCrN涂层，研究不同N2流量对AlCrN涂层显微组织及性能的影响，并选择最佳工艺参数制备具有AlCrN涂层的钨钢刀具。采用X射线衍射仪、激光共聚焦显微镜、显微硬度计、划痕仪、摩擦磨损试验机及数控加工中心研究了AlCrN涂层的组织结构、显微硬度、膜基结合力、摩擦磨损性能及其刀具的铣削性能，揭示了N2流量对AlCrN涂层的结构、硬度、膜基结合力和摩擦磨损性能的影响规律，分析了具有AlCrN涂层的钨钢刀具的切削失效机理。
通过对比不同N2流量的XRD图谱可知，随着N2流量的增加，薄膜组织变得致密，结晶好，柱状晶明显，因此衍射峰更明显。随N2流量的逐渐增大，大颗粒数量减少，这是因为随着N2流量的增加，靶材氮化程度变高，靶材的离化程度减少，沉积到表面的数量减少，且随N2流量增加，气体分子对大颗粒有一定的阻挡作用。AlCrN涂层的显微硬度随N2流量的增加呈先增后减的趋势，这是因为随着氮气分压的增大，生成具有适当化学剂量比的面立方结构体，降低了离子间距；另外入射离子能量逐渐降低，晶粒尺寸长大变得困难，不利于晶界形变。在N2流量为150sccm时，膜基结合力最强，AlCrN涂层形成褶皱，剥落形式呈块状剥离，磨痕较窄较浅，其主要磨损机制为磨粒磨损与粘着磨损。AlCrN涂层的摩擦系数约为0.35~0.45之间，在干摩擦条件下，AlCrN涂层的主要磨损机制为磨粒磨损、氧化磨损及涂层剥落损伤。
以钨钢（YG6X）为基体，AlCrN涂层硬质合金刀具在铣削速度为560r/min条件下进行铣削实验，研究表明，AlCrN涂层硬质合金刀具的失效过程为：首先切削刃口处涂层发生脱落，然后涂层与基体共同磨损，在切屑的粘结作用下，涂层发生进一步剥离，最后基体在粘结磨损和氧化磨损作用下快速磨损。

关键词：多弧离子镀；AlCrN涂层；膜基结合力；摩擦磨损性能；铣削
Study on Preparation and Cutting Performance of AlCrN Composite Tool Coating
Abstract In this paper, multi-arc ion plating technology was used to deposit AlCrN coating on the surface of tungsten steel. The effects of different N2 flow rates on the microstructure and properties of AlCrN coatings were studied. The best process parameters were chosen to prepare tungsten steel tools with AlCrN coating. The microstructure, microhardness, bond strength, friction and wear properties of AlCrN coatings were studied by X-ray diffractometer, laser confocal microscope, microhardness tester, scratch tester, friction and wear tester and numerical control machining center. The milling performance of the tool reveals the influence of N2 flow rate on the structure, hardness, bond strength and friction and wear performance of the AlCrN coating. The cutting failure mechanism of the tungsten steel tool with AlCrN coating is analyzed.
By comparing the XRD patterns of different N2 flow rates, it can be seen that as the N2 flow rate increases, the thin film structure becomes dense, the crystallinity is good, and the columnar crystals are obvious, so the diffraction peak is more obvious. With the gradual increase of N2 flow, the number of large particles decreases, because with the increase of N2 flow, the degree of nitridation of the target becomes higher, the degree of ionization of the target material decreases, the amount deposited on the surface decreases, and the flow rate with N2 increases. Increase, gas molecules have a certain role in blocking large particles. The microhardness of AlCrN coating increases first and then decreases with the increase of N2 flow rate. This is because as nitrogen partial pressure increases, a face cube structure with an appropriate stoichiometric ratio is generated, which reduces the ion spacing; The incident ion energy gradually decreases, grain size becomes difficult to grow, and it is not conducive to grain boundary deformation. When the flow rate of N2 was 150sccm, the bonding force of the film base was the strongest, the AlCrN coating formed wrinkles, the exfoliation form was massive exfoliation, the wear marks were narrow and shallow, and the main wear mechanisms were abrasive wear and adhesive wear. The friction coefficient of AlCrN coating is between 0.35 and 0.45. Under the condition of dry friction, the main wear mechanisms of AlCrN coating are abrasive wear, oxidative wear and coating peeling damage.
Using tungsten carbide (YG6X) as the substrate, AlCrN coated carbide cutting tools under the condition of milling speed of 560r/min milling experiments, research shows that the AlCrN coating carbide cutting tool failure process is: first coated cutting edge The layer falls off, and then the coating and the substrate wear together. Under the action of the bonding of the chip, the coating undergoes further peeling. Finally, the substrate wears rapidly under the action of adhesive wear and oxidation wear.
Key words: multi-arc ion plating, AlCrN coating, film-based bonding force ,friction and wear performance ,milling
 
目  录
摘  要    I
Abstract    II
目  录    IV
第一章 绪论    1
1.1 引言    1
1.2 多弧离子镀技术    1
1.2.1多弧离子镀的原理与特点    1
1.2.2 多弧离子镀的工艺参数    2
1.3  AlCrN涂层的研究现状    3
1.4  本课题研究的内容及意义    4
第二章 实验材料与实验方法    5
2.1 实验材料    5
2.2 实验方法    5
2.3 实验所用设备及仪器    7
2.4 组织分析及性能测试    9
2.4.1 XRD物相分析    9
2.4.2显微硬度测试方法    9
2.4.3试样金相组织观察    10
2.4.4  磨损性能测试方法    10
2.4.5  结合强度测试方法    10
2.4.6  铣削性能测试方法    11
2.5   本章小结    11
第三章 N2流量对AlCrN涂层组织结构的影响    12
3.1不同N2流量下AlCrN涂层的物相分析    12
3.2  不同N2流量下AlCrN涂层的显微组织分析    12
3.3  不同N2流量下AlCrN涂层的显微硬度分析    13
3.4  本章小结    14
第四章 AlCrN涂层的膜基结合强度及摩擦磨损特性研究    15
4.1AlCrN涂层的膜基结合强度研究    15
4.1 .1 AlCrN涂层的膜基结合强度    15
4.1.2 AlCrN涂层的损伤机制研究    16
4.2  AlCrN涂层的摩擦磨损特性及磨损机理研究    16
4.2.1  AlCrN涂层的摩擦磨损特性分析    17
4.2.2  AlCrN涂层的磨损机理研究    20
4.3  本章小结    20
第五章AlCrN涂层刀具的切削和摩擦学特性    22
5.1引言    22
5.2铣削实验试验条件与方法    22
5.3试验结果与讨论    23
5.4刀具磨损机理分析    24
5.5本章小结    25
结论    27
参考文献    28
致谢    30
附录    31