ZrN/TiN复合涂层刀具的制备及其磨损性能研究

采用中频磁控溅射和电弧离子镀两种方法组合在硬质合金基体上沉积ZrN／TiN复合涂层，采用切削试验来研究ZrN／TiN涂层对硬质合金刀具切削性能的影响。结果表明：ZrN／TiN复合涂层提高了硬质合金刀具的硬度，涂层刀具的显微硬度受基体硬度的影响，基体YG6、YT14涂层后的显微硬度分别可达2300HV，2500HV；使涂层刀具切削力的降低了20％；提高了涂层刀具的耐磨损能力。     

TiN/C3N4复合涂层的显微结构特征及其与性能的关系

利用扫描电镜和显微硬度及划痕试验对用反应磁控溅射法制备的TiN／C3N4复合涂层进行了较系统的研究，对TiN／C3N4复合涂层的横截面断口形貌进行了观察和分析。结果发现涂层呈平滑脆性断裂，并与呈韧性断裂的高速钢基体之间结合紧密，说明涂层具有很高的硬度和结合强度，能够满足刀具的使用要求。并对涂层的显微组织特征及其形成机理进行了初步讨论。     

Cr12MoV模具钢TiN涂层的力学性能

本文对Cr12MoV模具钢TiN涂层的力学性能进行了研究。用XRD等仪器测定了TiN涂层的组织结构和显微硬度、耐磨附着力等性能。     

高速钢刀具镀氮化碳超硬涂层研究

为了在高速钢刀具上制备先进的氮化碳超硬涂层，采用DC反应磁控溅射和电弧离子镀相结合的方法在高速钢上沉积氮化碳一氮化钛复合膜，经X射线衍射分析，复合膜中存在α-C3N4和β－C3N4两种硬度相。复合膜的显微硬度（HK）为50．5－54．1GPa，用划痕试验测量它与高速钢基体的附着力，测得临界载荷Lc=40-80N，多种刀具试用证实，该涂层具有很高的耐磨性，与未涂层和镀TiN的刀具相比，大幅度提高了刀具的耐用度。     

NiTi合金表面改性及其微动磨损性能研究

采用多弧离子镀技术在NiTi形状记忆合金表面制备TiN涂层。利用SRVⅢ摩擦磨损试验机研究NiTi合金表面改性后在37℃Hank’s模拟体液中微动磨损性能,分析法向载荷对TiN合金磨损机制的影响规律。利用SEM扫描电镜及能谱考察磨损表面形貌,结果表明：制备的TiN涂层表面致密均匀,无明显缺陷。说明TiN涂层可有效提高基体的耐磨性能,其磨损机制主要表现为剥落损伤与磨粒磨损并存。TiN涂层显微硬度为784 HV,远高于基体,TiN/NiTi膜基硬度比缓慢下降,涂层与基体结合强度高。     

ZL104合金表面反应等离子喷涂TiN复相涂层的组织和性能

采用反应等离子喷涂技术在ZL104合金基体上依次沉积NiCrAl黏结层和TiN复相涂层,通过X射线衍射、组织观察、硬度测试、拉伸及磨损试验等方法研究了涂层的物相组成、微观形貌、结合强度、硬度及耐磨性能,并探讨了磨损机制。结果表明:复相涂层由TiN、TiN_(0.3)和少量TiO_2组成,其组织致密,存在少量孔隙和微裂纹;涂层与ZL104合金结合良好,结合强度达17.7MPa;TiN复相涂层的平均显微硬度为1 330HV,约为基体的22倍,磨损量随载荷的增加而增加,且远小于基体的;ZL104合金的磨损机制为微切削磨粒磨损和微疲劳磨损,TiN复相涂层的为微切削磨粒磨损。     

硬基体上TiN薄膜涂层硬度的测定

通过系列载荷显微硬度试验，采用合适的硬度模型及随后的数据处理尽量排除薄膜涂层厚度及压痕尺寸效应的影响，较真实地测量了在高速钢基体上涂覆TiN薄膜的硬度，为表面涂层质量控制提供了一个有应用价值的试验方法。     

PCVD直流脉冲频率对TiN/TiSiN复合涂层结构与性能的影响

为了探讨频率对硬质合金基体上TiN/TiSiN复合涂层组织结构及性能的影响,选择了几个不同频率来制备TiN/TiSiN复合涂层。研究结果表明:不同频率制备TiN/TiSiN复合涂层的表面形貌都呈圆盘状颗粒,频率在30kHz-70kHz变化时,复合涂层颗粒尺寸随频率的增加而增大,均匀性随频率的增加而变差;复合涂层频率在30kHz-70kHz变化时,TiN始终在(200)方向上择优取向;硬质合金基体上,TiN/TiSiN复合涂层比单一TiN涂层的硬度提高更大,从1973 HV0.05增加到3417 HV0.05;30kHz时TiN/TiSiN复合涂层的硬度、涂层结合力和耐磨性能明显优于其他两种TiN/TiSiN复合涂层。故在硬质合金基体上,30kHz制备的TiN/TiSiN复合涂层工艺最佳。     

TiN涂层中的择尤取向及其对涂层性能的影响

对TiN多弧离子镀层的质量和性能进行了试验与分析。结果表明,涂层择尤取向对其质量和性能有影响,具有强烈TiN(111)择优取向的涂层表面光亮、硬度高、耐磨性好,与基体有较高的结合强度     

优化TiN/MT-TiCN/Al2O3/TiN多层涂层摩擦磨损性能的研究

通过研究微喷砂处理和使用TiOCN、ZrCN替代TiN顶层对TiN/MT-TiCN/Al2O3/TiN多层涂层摩擦磨损性能的影响,进一步提高TiN/MT-TiCN/Al2O3/TiN涂层刀具的性能.采用化学气相沉积(CVD)在硬质合金基体上沉积TiN/MT-TiCN/Al2O3/TiN、TiN/MT-TiCN/Al2O3/TiOCN和TiN/MT-TiCN/Al2 O3/ZrCN多层涂层,并进行微喷砂处理.采用扫描电子显微镜(SEM)表征涂层的组织结构,采用显微硬度计、划痕测试仪和往复式多功能摩擦磨损实验机(UMT-3)分别对涂层的硬度、结合强度和摩擦磨损性能进行测试.结果 表明:微喷砂处理后,TiN/MT-TiCN/Al2O3/TiN多层涂层的顶层TiN被完全去除,摩擦系数增大,且涂层发生剥落、疲劳磨损严重,耐磨性下降.经微喷砂处理的TiN/MT-TiCN/Al2 O3/TiOCN涂层硬度最高,磨粒磨损程度最轻,且无明显剥落,耐磨性最好.经微喷砂处理的TiN/MT-TiCN/ Al2O3/ZrCN涂层摩擦系数最小,但硬度低,磨粒磨损严重,且涂层存在明显剥落,耐磨性较差.     

复合氮化合物薄膜的研究

采用多源PVD技术在YG8硬质合金基体上分别沉积了Ti N和Ti NX薄膜,利用X射线衍射仪、扫描电子显微镜以及多功能材料表面试验仪,研究了多种元素的添加对Ti N涂层微观结构、断口和表面形貌的影响。结果表明:添加多种元素可使Ti N涂层的微观结构发生明显变化,能有效控制膜的结晶和生长模式,改变传统的(111)面的单一取向,从原来的(111)的择优取向,转变为(200)、(111)、(220)共同取向;Ti NX涂层的断口呈非柱状结构,表面粗糙度小于Ti N,具有更为均匀致密的结晶结构和光整的表面形貌,趋于Ti Al N薄膜的显微硬度,一致的结晶组织结构、有效的沉积效率、良好的膜基结合力有利于厚膜Ti N的制备;相对于Ti N,寿命可提高50%-100%。     

Effect of laser power on the microstructure and mechanical properties of TiN/Ti3Al composite coatings on Ti6Al4V

Laser nitriding is one of the effective techniques to improve the surface properties of titanium alloys and has potential application in the life extension of last-stage steam turbine blades. However, cracking of surface coating is a common problem due to heat concentration in laser nitriding process. Conventionally, the cracks can be avoided through heat treatment, which may have an important influence on the mechanical properties of coating. Crack-free TiN/Ti3Al IMC coatings on Ti6Al4V are prepared by plasma spraying and laser nitriding. The microstructures, phase constitutes and compositions of the coating are observed and analyzed with scanning electron microscopy(SEM), X-ray diffraction(XRD) and X-ray energy-dispersive spectroscopy(EDS). Microhardness, elastic modulus, fracture toughness of the coating are measured. The results show that the crackand pore-free IMC coatings can be made through the proposed method; with increasing laser power, the amount and density of TiN phase in the coating first increased and then decreased, leading to the similar trend of microhardness and elastic modulus and the reverse trend of fracture toughness of the coating. Both the average microhardness and elastic modulus of the coating increase three times higher than those of the substrate. The volume fraction of the TiN reinforced phase in composite can be controlled by varying the laser power and the cracking problem in laser nitriding process is successfully solved.     

氮化钛硬质薄膜的制备和性能分析

研究热阴极离子镀设备制备TiN薄膜膜层的主要性能。采用自主研发的XH-830型热阴极离子镀膜机,在硬质合金ZK1基体上制备TiN薄膜;利用X射线衍射仪,自动划痕仪,显微硬度计和扫描电镜对薄膜进行了结构分析和性能检测。采用XH-830镀膜机能制备单一的TiN薄膜,膜层晶体为细小的柱状晶,膜-基结合力能达到81N,TiN硬度达到2240HV以上,经切削试验证明,能提高被镀刀片寿命30％。     

TiC-TiN-TiC-Al_2O_3涂层CP3型硬质合金抗弯强度及其分散性的研究

通过X衍射法对CP3型硬质合金涂覆TiC TiN TiC Al2 O3 四层硬质层的组织结构进行了研究 ,用扫描电镜观察了涂层的断口形貌 ,用划痕法测定了涂层与基体的结合力 ,用三点弯曲法测定了涂覆前、后该硬质合金的抗弯强度 ,并应用Weibull统计方法对该材料的抗弯强度及其分散性进行了分析。研究结果表明 :涂层组织由TiC、TiN和Al2 O3 组成 ,涂层中无发达的柱状晶 ,涂层与基体结合良好 ,涂覆后硬质合金的平均抗弯强度从涂覆前的2 119MPa下降到 15 80MPa ,但其抗弯强度的分散性变化不大     

The study of the adhesion of a TiN coating on steel and titanium alloy substrates using a multi-mode scratch tester

A titanium nitride (TiN) coating was deposited by magnetron sputter ion plating onto steel and titanium alloy polished substrates. The adhesion of the coating on each substrate material was investigated using a newly developed multimode scratch tester. Progressive loading scratch tests, constant load scratch tests, multiple scratch tests in the same track and indentation tests were all performed. It was shown that the modified scratch tester can be used to identify not only coating detachment during progressive load scratch tests, but also other failure events such as cracking and cohesive damage to the coatings. By using the additional modes of operation, it was possible to study the fracture mechanisms in more detail i.e. chipping in the scratch track was cohesive for the TiN coated steel and adhesive for the TiN coated Ti alloy.     

CVD涂层α-Al2O3织构制备技术研究

采用化学气相沉积法在硬质合金基体上沉积具有不同织构择优的α-Al2O3涂层,通过扫描电子显微镜(SEM)、X射线衍射(XRD)分别对其微观组织和机械性能进行分析。研究结果表明,通过改善过渡层的氧化气氛,氧化铝的过渡层结构为针状物,成功制备不同织构的氧化铝涂层,涂层结合力良好。     

Tribological performance of TiN and TiCN coatings on a working tool steel

Although the applications of TiN and TiCN coatings are extensive, their mechanical and tribological properties are influenced by the substrates in which they are deposited. The present work is focused on the tribological performance of TiN and TiCN coatings on a working tool steel. Besides, adhesion and microhardness tests were carried out. The adhesion performance of both coatings resulted in class 1, according to CEN/TS 1071–8 standard, which allows observing the quality of adhesion. The composite microhardness was investigated by the analysis of relative indentation (β). Pin-on-disk tests were performed in dry and lubricated condition at 100 °C against tungsten carbide (WC). Low friction coefficients of μ_k = 0.08 for TiN and μ_k = 0.03 for TiCN were obtained in lubricated conditions. Wear mechanisms were analyzed by scanning electron microscopy (SEM). Abrasive wear was observed as the principal wear mechanism in dry condition, while in lubricated conditions wear signals seem to be scarcely noticeable.     

高速钢刀具磁控溅射离子镀TiN涂层的工艺与性能研究

采用磁控溅射离子镀法(MSIP)对高速钢W18Cr4V进行了TiN镀膜试验,对镀膜后试样的各项性能进行了测试分析,并对溅射时间、氮分压、溅射电流等工艺参数对TiN膜层的显微组织、厚度、硬度和耐磨性的影响进行了研究,确定了可获得最佳涂层综合性能的镀膜工艺参数。     

基体表面粗糙度对磁控溅射TiN涂层界面结合力的影响

利用球与平面的赫兹接触应力分布的经验修正公式∧［1］,对磁控溅处理前的基体表面粗糙度对沉积层和基体的界面结合力进行了研究,并和其他涂层界面结合力的测量方法方法进行了比较。结果表明：基体表面粗糙度对界面结合力有很大影响,表面粗糙度的改善有利于TiN层/基体的界面结合力的提高,同时改善了TiN层的摩擦学性能。     

TiAlN涂层及微观组织结构研究

通过改变工艺参数,采用非平衡磁控溅射法在硬质合金基体上制备Ti Al N涂层来研究涂层微观结构的变化规律。经表面和断口形貌的扫描电镜结果显示,增加主因素偏压,涂层表面趋向光滑平整,结构趋向致密,表面的大颗粒数量明显减少。EDS能谱分析表明,涂层元素的含量受偏压和N2流量影响较大。XRD分析发现,膜层中有Ti Al N系和Ti N系的物相结构,Ti N/Ti Al N多层涂层主要从(111)晶面择优取向生长。