高速钢刀具固体润滑涂层的试验研究

借助M-2型摩擦磨损试验机考察了在试件表面涂敷由MoS2、石墨、Al2O3、Sb2O3复配而成的固体润滑涂层后的摩擦学性能,通过正交试验得到最佳配比为:MoS2:石墨:Al2O3:Sb2O3=7:4:2.5:4。将复合固体润滑涂层涂敷于高速钢车刀并进行切削试验,试验结果表明,复合固体润滑涂层可以改善刀具切削过程中的润滑条件,大大提高刀具切削性能。     

固体润滑剂减摩胶涂层的实验研究

选用二硫化钼、石墨、三氧化二铝3种固体润滑剂，将其分别制成减摩胶，并涂覆在试样上，测定其减摩性能。试验表明：石墨和MoS2在试验条件下，其减摩胶的减摩性能优于三氧化二铝减摩胶。而将这3种固体润滑剂制成复合减摩胶涂层进行试验，减摩性能又有显著提高。     

粘结固体润滑涂层在油润滑条件下的摩擦学性能

为了探讨粘结MoS2基固体润滑涂层在油润滑条件下的抗磨减摩性能,采用MHK-500型摩擦磨损试验机对粘结MoS2基固体润滑涂层在4种常用油(液体石蜡、RP-3煤油、4050滑油和CD-40柴油)润滑下的摩擦磨损性能进行了研究,考察了速度和载荷对润滑涂层在4种不同的常用油润滑下的摩擦磨损性能。结果表明,在低载荷(320N)试验条件下,4种常用油润滑下涂层的耐磨性比干摩擦下得到显著的提高,摩擦因数从0.12降低到0.08左右;但在高载荷(1100N)下,油润滑对涂层的摩擦磨损性能没有明显的改善。只有在合适的载荷下,固/油复合润滑技术可明显改善摩擦副的润滑性能。     

波箔气体轴承MoS2基润滑涂层的制备和性能研究

为了提高波箔轴承的耐磨减摩性能,采用喷涂法在平箔片和圆盘试样上制备MoS_2固体润滑涂层,并对圆盘试样涂层结合强度进行分析;采用自制球盘摩擦磨损试验机研究涂层圆盘试样的摩擦磨损性能,通过扫描电镜(SEM)测试涂层圆盘试样摩擦磨损前后表面、截面形貌,利用波箔轴承性能测试实验台探究涂层在实际工作中的耐磨减摩性能。研究结果表明:基体表面的粗糙度影响MoS_2涂层的结合强度,其中试样表面进行喷砂处理后与MoS_2涂层结合力最好;制备的MoS_2固体润滑涂层中各成分均匀分布,涂层的结合方式以机械结合为主;球盘摩擦磨损试验表明,制备的MoS_2涂层的耐磨减摩性能较好,其平均摩擦因数相比不锈钢基体降低了54.5%左右,磨损量相对减小了40.7%;波箔轴承台架试验表明,制备的MoS_2涂层减摩性能已接近商用PTFE涂层,但其耐磨性能较差。     

立方氮化硼复合固体涂层的摩擦学性能研究

将固体润滑剂MoS2、WS2、Sb2O3与立方氮化硼（CBN）复配制备成复合固体涂层,通过正交试验确定复合固体涂层各组元的最优配比,在高温高压条件下考察复合固体涂层的摩擦学性能。试验结果表明,CBN、WS2、MoS2、Sb2O3的质量比为3∶2∶2∶1时,制备的CBN复合固体涂层摩擦因数最低,其中CBN和WS2在复合涂层中起主要的减摩抗磨作用。制备的CBN复合固体涂层在高温高压下仍具有优良的减摩抗磨性能,其摩擦因数随温度的升高而增加,随压力的增加而降低。     

立方氮化硼复合固体涂层的摩擦学性能

将固体润滑剂MoS_2、WS_2、Sb_2O_3与立方氮化硼(CBN)复配制备成复合固体涂层,通过正交试验确定复合固体涂层各组元的最优配比,在高温高压条件下考察复合固体涂层的摩擦学性能。试验结果表明,CBN、WS_2、MoS_2、Sb_2O_3的质量比为3∶2∶2∶1时,制备的CBN复合固体涂层摩擦因数最低,其中CBN和WS_2在复合涂层中起主要的减摩抗磨作用。制备的CBN复合固体涂层在高温高压下仍具有优良的减摩抗磨性能,其摩擦因数随温度的升高而增加,随压力的增加而降低。     

耐高温复合固体润滑涂层的研究

MoS2、WS2、Sb2O3三种物质都是常见的金属基固体润滑剂,且性能优良,但作为单一涂层的局限性较大,因此,可将三种物质复配组成一种耐高温复合固体润滑涂层,设计正交试验,优化涂层配比,通过高温摩擦磨损试验和电镜探讨该耐高温复合涂层的润滑性能、分析其润滑机理。     

耐高温复合固体润滑涂层的研究

常见的金属基固体润滑剂MoS 2、WS 2、Sb 2 O3性能优良,但作为单一涂层的局限性较大.将3种固体润滑剂复配成一种耐高温复合固体润滑涂层,通过正交试验得到优化的涂层配比,通过高温摩擦磨损试验考察该复合涂层的润滑性能.结果表明,在高温高压下该复合涂层具有较低的摩擦因数和良好的耐磨性能.电镜分析表明,高温高压摩擦磨损试验后,涂层试件表面仍然存在较均匀的固体润滑膜,可以起到很好的润滑作用.     

石墨含量对石墨固体润滑涂层摩擦学性能的影响

利用简便的刷涂法在钢基体表面制备了石墨固体润滑涂层。利用MM-200型摩擦磨损试验机对不同石墨含量的固体润滑涂层进行了详细的摩擦学性能对比试验。结果发现．石墨固体润滑涂层的摩擦学性能与石墨含量之间呈“马鞍形”变化规律，当石墨的质量分数为28％时，固体润滑涂层的减摩、耐磨性能最佳。     

固体添加剂、摩擦改进剂在锂基润滑脂中的应用研究

针对常用复合锂基润滑脂存在的润滑极压抗磨性不足等问题,研究不同固体添加剂、摩擦改进剂对复合锂基润滑脂极压抗磨减摩性能的影响。结果表明,固体添加剂对复合锂基润滑脂极压抗磨性能影响较大,其中PTFE和二硫化钼组成的复配剂可使润滑脂得到优异的极压和抗磨性能;摩擦改进剂Priolube 3986复酯和硬脂酸复配具有协同作用,可明显增强润滑脂的抗磨减摩性能;固体添加剂和摩擦改进剂对润滑脂的润滑作用可以优势互补,全面提升润滑脂综合性能。     

Influence of Polyfluo-Wax on the Friction and Wear Behavior of Polyimide/Epoxy Resin–Molybdenum Disulfide Bonded Solid Lubricant Coating

Polyimide/Epoxy resin–molybdenum disulfide bonded solid lubricant coatings (denoted as PI/EP-MoS₂) were prepared. The influence of polyfluo-wax (denoted as PFW) on the microhardness and friction and wear behavior of as-prepared PI/EP-MoS₂ lubricant coating was measured using a microhardness tester and a reciprocating ball-on-disc tribometer, respectively. The worn surfaces of the lubricant coatings were observed with a scanning electron microscope, and their wear rate was determined with a Micro XAM surface mapping microscope. Moreover, the transfer films formed on the counterpart steel ball surfaces were analyzed by X-ray photoelectron spectroscopy. Results indicate that the incorporation of a proper content of PFW filler is effective at improving the antifriction performance of the PI/EP-MoS₂ lubricant coating while maintaining better wear resistance. Moreover, the friction coefficient of the lubricant coating decreases with increasing content of PFW from 2 to 10%, and the one with a filler content over 6% PFW has a steady friction coefficient of 0.07. The improvement in the antifriction performance of the lubricant coating with the incorporation of the PFW filler is attributed to the excellent lubricity of homogeneously distributed PFW.     

Antiwear Properties of Bonded MoS2 Solid Lubricant Coating under Dual-Rotary Fretting Conditions

Bonded MoS₂ solid lubricant coatings are widely used in tribology for their friction-reducing and antiwear properties. However, such coatings have been rarely investigated in complex fretting conditions, such as dual-rotary fretting (DRF). DRF is a complex fretting wear mode that combines torsional fretting with rotational fretting. In this work, the antiwear properties of bonded MoS₂ solid lubricant coating under dual-rotary fretting conditions were studied. Results indicated that the MoS₂ coating had better friction-reducing and antiwear properties than the substrate for alleviating DRF wear. The coating can greatly influence the fretting regimes and reduce the coefficient of friction. Furthermore, the service life of the coating was strongly dependent on the competition of the two fretting components and was reduced as the rotational fretting component increased.     

Test Analysis of Friction Couples With Solid Lubricant Coatings under Ground–Space Conditions and Prediction of Tribological Characteristics

As a result of an analysis of the literature data on ground–space tribological tests of friction couples with solid lubricant coating (SLC) ARSRI PP 212, the dependences for evaluating the starting antifriction characteristics have been determined. The wear life and coefficient of friction have been compared. According to results, calculation algorithms of tribological characteristics of friction couples with SLC for considered operational conditions have been developed and implemented.     

有机粘结固体润滑剂涂层砂轮磨削性能研究

采用有机粘结固体润滑剂（六方氮化硼和石墨）制备的涂层砂轮对钛合金进行了干磨削试验,研究了有机粘结固体润滑剂涂层砂轮在不同磨削工艺参数下对钛合金的磨削温度和工件表面质量的影响规律。试验结果表明,所制备的有机粘结固体润滑剂涂层砂轮干磨削钛合金工件时,磨削温度比无润滑剂涂层砂轮干磨削钛合金时下降11%~40%,工件表层显微组织未见明显变化。     

CrAlTiN梯度涂层高速钢刀具的切削性能研究

用闭合场非平衡磁控溅射离子镀PVD涂层工艺在高速钢麻花钻上沉积了CrA lTiN梯度涂层。在干式切削条件下,对45#号钢和30CrMnS iA钢进行了钻削试验。通过涂层与未涂层钻头的寿命、磨损和切削力等试验比较,表明CrA lTiN梯度涂层钻头的切削性能远优于未涂层钻头,是一种极有发展前途的刀具涂层。     

不同涂层刀具切削淬硬H13钢加工性能研究

为了研究不同涂层刀具切削淬硬H13钢的切削性能,进行了多层Ti化合物涂层、TiAlN涂层以及MTTiCN厚Al_2O_3TiN涂层材料刀具车削加工淬硬H13钢试验,分析了不同的涂层材料刀具与切削力、切削温度、涂层刀具磨损以及刀具寿命的关系。研究得出:多层Ti化合物涂层刀具受到三个方向的力都大于其它两种涂层的刀具,而且切削温度最高;用TiAlN涂层刀具切削时温度最低;切削过程中三种刀具后刀面磨损程度不同,发现多层Ti化合物涂层刀具磨损最为严重,寿命最短;MT-TiCN厚Al_2O_3Ti N涂层材料刀具比多层Ti化合物涂层刀具寿命长30%;TiAlN涂层刀具的切削寿命最长比多层Ti化合物涂层刀具寿命长45%。     

Experimental estimate of tribological characteristics of epilam-coated materials that operate in threaded joints under dry friction

Friction in the threaded joint of a screw and nut, the surfaces of which are treated by an epilam, is experimentally studied and an analytical engineering calculation of the coefficient of friction in this threaded joint is presented. Results of the study show the efficiency of the method for depositing a molecular film of the fluorine-containing surfactant (epilam) in order to reduce the friction losses in the screw-nut joint. It is shown that the coefficients of dynamic and static friction in the threaded joint are substantially smaller than those for the material without an epilam coating. The wear resistance of the epilam-coated materials increases due to the formation of a solid lubricant on the surfaces of the materials in contact. The results of the study show that the ultrathin epilam film prevents the occurrence of seizures in the threaded joint. The thermal tests have demonstrated that, after heating the epilam-coated material to a temperature of over 300°C, the coating loses its unique antifriction properties.     

晶粒细化对金刚石涂层刀具切削性能的影响

金刚石涂层具有高硬度、低摩擦系数、高耐磨性和高导热性能。本文着重介绍了金刚石涂层刀具的发展动向及现状,并通过金刚石涂层刀具的切削试验表明了金刚石涂层刀具的使用寿命明显高于未涂层的硬质合金刀具,采用金刚石涂层刀具进行切削可以获得更高的表面加工质量和生产率。     

Comparative study on tool life and wear resistance of titanium nitride (TiN) and aluminium chromium nitride (AlCrN) coated carbide inserts

Abstract

The objective of this study is to investigate the enhancement of tool life and wear resistance with a physical vapour deposition (PVD) process applied using aluminium chromium nitride (AlCrN) and titanium nitride (TiN) coating on carbide inserts. Flank wear experiments are carried out on a computer numerically controlled (CNC) machine under wet conditions with both the coated inserts. Effectiveness of the coating on the tool life and its resistance to flank wear are observed at various cutting parameters such as cutting speed and feed rate by following the principle of design of experiments (DOE). It is inferred that AlCrN coated carbide tools perform nearly 70% better than the TiN coated carbide tools under high cutting speed and feed rate. AlCrN coating also enhances the durability of tool for metal cutting and thereby improves tool life even under harsh cutting conditions. A response surface methodology (RSM) is utilised to arrive at the optimum value for the various parameters which are responsible for improving the wear resistance and tool life.     

特殊螺纹套管接头纳米铜干式涂层的制备及性能研究

以添加少量PTFE纳米颗粒的纳米铜为基体,以环氧树脂为黏结剂,制备出一种纳米铜固体润滑涂料;采用摩擦试验机研究室温下不同环氧树脂添加量的纳米铜涂层的摩擦性能,并与常规螺纹脂进行对比;利用盐雾试验机对涂层进行耐盐雾腐蚀测试;将纳米铜固体润滑涂料涂覆于套管螺纹表面,进行上卸扣试验。结果表明：环氧树脂质量分数为40%的纳米铜固体润滑涂层减摩性能和耐盐雾腐蚀性能等综合性能最佳,且涂层的摩擦性能优于螺纹脂;纳米铜干式涂层接头进行10次上卸扣试验后未发生黏扣现象,因此纳米铜干式涂层具有代替现有螺纹脂的潜力。