氮化钛镀膜刀具

沈阳真空技术研究所技协积极发挥工程技术人员的专长,研制出了DKYLZ-100型离子镀膜机,用这台设备镀出氮化钛膜层的刀具如插齿刀、滚齿刀、拉刀、钻头、丝锥等比不经镀层的刀具,提高刀具寿命3～18.9倍。经测定未镀膜高速钢刀具其显微硬度为HV800,镀氮化钛后的显微硬度达HV1800。     

多弧离子镀(Ti,Cr)N膜层工艺及性能

用多弧离子镀膜机，以W6Mo5Cr4V2高速钢为基体材料，镀覆（Ti,Cr）N多元膜，研究了多弧离子镀工艺对膜层性能的影响，确定了最佳镀膜工艺参数，探讨了多元膜层的强化机理。结果表明：膜层硬度及膜基结合力随偏压的增大而增大，膜层强度随氮分压的升高而增大，孔隙率随氮分压的升高而增大。（Ti,Cr)N多元膜层强化机理主要是：晶粒细化、固溶强化、多元素优化。     

不二越公司的涂层刀具产品

<正> 1、金刚石涂层刀具采用等离子CVD工艺进行金刚石涂层处理后,钻头、立铣刀等复杂形状刀具的硬度接近天然金刚石。刃尖磨损速度与烧绪金刚石相同,主要用于铝合金,铜合金、锌、GFRP、预烧陶瓷等材料的切削加工。用金刚石涂层刀具加工一般铝合金时,工具寿命为硬质合金的5～10倍;加工高含量硅铝合金时,达10～50倍;加工预烧陶瓷对,高达100～1000倍。目前,该公司可提供的金刚石涂层产品有:可转位刀片、钻头、立铣刀、丝锥等。2、涂层丝锥基体为微细晶粒硬质合金,涂层为TiCN。这种丝锥具有良好的耐磨性和抗崩刃性。其使用寿命为高速钢丝锥的100     

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％。     

离子镀提高W4Mo3Cr4VSiN钢制丝锥使用寿命的研究

为提高W4Mo3Cr4VSiN（F205）低合金高速钢丝锥的使用寿命,对该钢进行了1160℃淬火、不同温度下回火热处理,并对较佳工艺回火后的丝锥表面进行离子镀TiN,对其组织和性能进行了研究。结果表明：560℃回火时,F205钢的硬度达到了最大值;丝锥表面离子镀TiN后,获得金黄色TiN涂层,约2．5μm厚时,涂层的显微硬度达到1921HV50,与基体的结合力最高达35N。丝锥的使用寿命提高了2倍。     

高速钢丝锥刃口电解强化技术

研究一种刀具刃口的电解强化方法,以期提高刀具寿命和切削稳定性.设计刀具刃口电解强化装置和工艺流程.以高速钢丝锥为实例,确定刀具刃口电解强化的电解液配方,选择阴极材料等工艺参数,研究刃口强化量与极间距离、电流密度、抛光持续时间和极间电压之间的关系.用优化工艺参数电解强化处理丝锥,刃口整齐,丝锥各刀齿刃口强化量均匀,符合刃口强化的几何形状,刃口强化后丝锥前刀面表面粗糙度降低.利用以上研究结果,进行切削40Cr、ZG230～450和1Cr18Ni9Ti的切削试验,加工400r和ZG230～450丝锥寿命提高2倍左右,加工不锈钢丝锥寿命影响不明显.研究表明,采用电解强化方法处理高速钢丝锥可以提高其使用寿命,效果与被加工材料和刃口强化量有关.     

深冷处理工艺对丝锥寿命的影响

本文以M2Al高速钢丝锥为研究对象,在常规热处理中引入深冷处理工艺,设计了四种不同的工艺对丝锥进行了处理,并进行攻丝试验,探究深冷处理工艺对丝锥寿命的影响.研究表明:深冷处理工艺有效的提高了丝锥的使用寿命,最优深冷工艺组丝锥攻丝孔数达到了88个,相较于常规工艺组寿命提高了1.6倍;通过微观分析发现耐磨性提高的原因是二次...     

金刚石薄膜在轴承行业的应用研究

对金刚石薄膜成膜及应用技术进行研究,探讨金刚石薄膜在轴承行业应用的可能性。通过对金刚石薄膜成膜工艺的研究,认为轴承表面金刚石固体润滑膜宜采用物理气相沉积（PVD）工艺,该工艺沉积温度较低,镀膜后,不会改变轴承材料组织及性能,轴承精度基本不受损失。所得到的金刚石膜为类金刚石膜,具有膜面平整光滑、摩擦系数低、耐磨损、耐高温、耐腐蚀、薄膜与基体结合力较强等优良性能,能够满足特殊工况轴承固体润滑需要。同时进行了金刚石薄膜性能测试与评价技术的研究。     

高速钢对焊丝锥断裂原因分析

1　问题的提出1998年我厂生产的Ｇ112 和Ｍ52规格的高速钢对焊丝锥 (刃部材质Ｗ6Ｍｏ5Ｃｒ4Ｖ2 ,柄部材质 4 5钢 )经对焊、机加工、淬火、回火后再进行机加工时 ,发现部分丝锥距高速钢刃部一侧出现横断裂纹 (见图 1和图 2 )。图 1　Ｇ112 丝锥裂纹部位图 2　Ｍ5 2丝锥裂纹部位通过对断裂丝锥作常规分析可知 :两种规格丝锥的化学成分均符合国家标准 ;刃部表面硬度合格( 63～ 64ＨＲＣ) ;焊缝高速钢处金相组织符合要求。检查丝锥断口后可知 :①Ｇ112 丝锥断口位于距焊缝不远的高速钢刃部一侧 (与焊缝接近重合 ) ,断口从铣刀柄部加工平面直角根…     

高速钢涂层刀具

高速钢是制造金属切削刀具的主要材料,它的使用面广量大,在我国刀具材料构成中,高速钢占有绝对的比例,约占80％以上。为了充分发挥高速钢的切削性能,提高刀具的耐磨性,可在其表面上镀覆一薄层耐磨的难熔金属化合物(简称涂层刀具)。试验表明。在高速钢车刀、钻头、铰刀、丝锥、立铣刀、拉刀和齿轮滚刀等刀只上涂上一层2～5μm厚的氮化钛(TiN)涂层后,硬度可达HRC80以上,并且表面摩擦系数减小,刀具耐用度可提高2～5倍,甚至10倍。但涂层刀具使用的效果与涂层方法、涂层材料、涂前刀具的处理以及刀具的合理使用等有关,现就上述问题介绍如下: 一、涂层方法目前生产上常用的涂层方法有两种:物理气相沉     

CVD金刚石涂层拉丝模的研制与应用

:以市售大孔径 (>2mm)硬质合金拉丝模为衬底 ,经酸腐蚀去钴、研磨和还原处理后 ,以氢气和丙酮为原料 ,用穿孔直拉热丝CVD法制备了金刚石涂层。利用扫描电镜和喇曼谱图对涂层均匀性进行了评估。初步应用试验表明 ,金刚石涂层的附着力能满足实际拉伸要求 ,涂层拉丝模的工作寿命可提高 3～ 5倍。     

Friction and Wear Performance of Boron Doped,Undoped Microcrystalline and Fine Grained Composite Diamond Films

Chemical vapor deposition(CVD) diamond films have attracted more attentions due to their excellent mechanical properties. Whereas as-fabricated traditional diamond films in the previous studies don’t have enough adhesion or surface smoothness, which seriously impact their friction and wear performance, and thus limit their applications under extremely harsh conditions. A boron doped, undoped microcrystalline and fine grained composite diamond(BD-UM-FGCD) film is fabricated by a three-step method adopting hot filament CVD(HFCVD) method in the present study, presenting outstanding comprehensive performance, including the good adhesion between the substrate and the underlying boron doped diamond(BDD) layer, the extremely high hardness of the middle undoped microcrystalline diamond(UMCD) layer, as well as the low surface roughness and favorable polished convenience of the surface fine grained diamond(FGD) layer. The friction and wear behavior of this composite film sliding against low-carbon steel and silicon nitride balls are studied on a ball-on-plate rotational friction tester. Besides, its wear rate is further evaluated under a severer condition using an inner-hole polishing apparatus, with low-carbon steel wire as the counterpart. The test results show that the BD-UM-FGCD film performs very small friction coefficient and great friction behavior owing to its high surface smoothness, and meanwhile it also has excellent wear resistance because of the relatively high hardness of the surface FGD film and the extremely high hardness of the middle UMCD film. Moreover, under the industrial conditions for producing low-carbon steel wires, this composite film can sufficiently prolong the working lifetime of the drawing dies and improve their application effects. This research develops a novel composite diamond films owning great comprehensive properties, which have great potentials as protecting coatings on working surfaces of the wear-resistant and anti-frictional components.     

STUDY ON COATING MECHANISM OF DIAMOND FILM ON CUTTING TOOL AND ITS APPLICATION

0 INTRODUCT[ONDiamond is a kind Of excellent cutting tool material for cutting non-fermus metal and nonmetallicmaterials. Because of the limited supply and high cost of natural diamond it has been mainly used forspecial aPPlications Where no other tools can Perform satisfactorily.The study of dePOsition of diamond film on cutting tools and its wide aPPlications began in 1980.Great Progress has been made at the same time. The [ypical principles used in coated-cutting tool are thehacrow…     

Surface Modification of Polyether Ether Ketone (PEEK) with a Thin Coating of UHMWPE for Better Tribological Properties

The effect of normal load and sliding speed on the tribological properties of a thin film of ultra-high-molecular-weight polyethylene (UHMWPE) coated onto a polyether ether ketone (PEEK) substrate sliding against a stainless steel ball in dry conditions are investigated. Wear tests are carried out with a ball-on-disc configuration to evaluate the tribological properties of the plasma-treated PEEK samples coated with UHMWPE film at different normal loads (5, 7, and 9 N) and linear speeds (0.1, 0.2, and 0.5 m/s). The coated samples exhibited a very low coefficient of friction of ～0.09 compared to that of uncoated PEEK samples, which showed a coefficient of friction of ～0.3.     

CVD金刚石涂层刀具切削性能的试验研究

金刚石薄膜具有高硬度、低摩擦系数、高耐磨性和高导热性能。文中通过用金刚石薄膜涂层刀具对含硅量不同的硅铝合金进行干切削试验,探讨其切削性能。     

Assessment of adhesion between thin film and silicon based on a scratch test

Thin film coatings are commonly utilized to prevent wear, modify surface properties, and manipulate the frictional behavior of various mechanical systems. The behavior of a coating has a direct effect on the life as well as performance of the system. However, the coating itself is subject to damage, and the quality of the coating is related to the adhesion characteristics between the coating and the substrate. Therefore, a quantitative assessment of the adhesion properties of thin film is important to guarantee the reliability of not only the thin film but also the mechanical system. In this study, ramp loading scratch tests were performed to assess the adhesion characteristics of Ag and ZnO thin films coated on a silicon wafer. Silver thin film, deposited by sputtering, and ZnO thin film, fabricated by a sol-gel method, were used as scratch specimens. Scratch tests using a diamond tip were performed with a continuously increasing normal force. During the scratch test, the normal and frictional forces were monitored to assess the integrity of the film. The Benjamin and Weaver model commonly used for obtaining the horizontal force during the scratching of films coated on a substrate showed large discrepancies with the experimental results. In this work, the model was modified with a plowing term to minimize the difference between the experimental and theoretical results. Using the modified model, the experimental results could be predicted with an accuracy of about 10%.     

Mechanical and tribological properties of amorphous carbon films

The mechanical and tribological properties of amorphous carbon films have been studied in more detail in recent years because these films (a) can be deposited near room temperature, thus allowing film deposition on common engineering alloys (i.e., aluminum and steel) without altering their mechanical properties, and (b) are smooth and conform to surface roughness of the substrate, thus requiring no post deposition processing. In addition, amorphous carbon films exhibit low unlubricated sliding friction in contact with steel and ceramics which is comparable to that of steel against steel in a lubricated contact. The wear resistance of these films is also better than Ti‐based hard coatings. Further improvement in film tribological properties can be achieved by modifying film chemical composition. Because of these attractive features, amorphous carbon films have been evaluated in several applications including automotive, electronic and biomedical engineering. However, environmental factors such as oxygen and humidity have been found to influence tribological properties significantly. This paper reviews the current understanding of the tribological properties of both hydrogenated and non‐hydrogenated amorphous carbon films, the mechanisms responsible for low friction coefficient and identifies areas that require further research. This revised version was published online in June 2006 with corrections to the Cover Date.     

Characterization and tribological investigation of self-assembled lanthanum-based thin films on glass substrates

Rare-earth (RE) (lanthanum-based) thin films were prepared on hydroxylated glass substrates by a self-assembling process from specially formulated solution. Atomic force microscope (AFM) and X-ray photoelectron spectrometry (XPS) and scanning electron microscope (SEM) are used to characterize the thin films. The tribological properties of the as-prepared thin films sliding against a steel ball were evaluated on a friction and wear tester. The tribological experiment shows that the friction coefficient of glass substrate reduced from 0.85 to 0.13 after the formation of RE self-assembled film (SAM) on its surface. And the RE self-assembled film has longer wear life (2880 sliding pass). It is demonstrated that RE self-assembled film exhibited good wear resistant property. The superior friction reduction and wear life of RE films are attributed to good adhesion of the film to the substrate and special characteristic of the RE elements.     

Friction and wear behaviors of MoS2/Zr coated HSS in sliding wear and in drilling processes

MoS2 metal composite coatings have been successful used in dry turning, but its suitability for dry drilling has not been yet established. Therefore, it is necessary to study the friction and wear behaviors of MoS2/Zr coated HSS in sliding wear and in drilling processes. In the present study, MoS2/Zr composite coatings are deposited on the surface of W6Mo5Cr4V2 high speed steel(HSS). Microstructural and fundamental properties of these coatings are examined. Ball-on-disc sliding wear tests on the coated discs are carried out, and the drilling performance of the coated drills is tested. Test results show that the MoS2/Zr composite coatings exhibit decreases friction coefficient to that of the uncoated HSS in sliding wear tests. Energy dispersive X-ray(EDX) analysis on the wear surface indicates that there is a transfer layer formed on the counterpart ball during sliding wear processes, which contributes to the decreasing of the friction coefficient between the sliding couple. Drilling tests indicate that the MoS2/Zr coated drills show better cutting performance compared to the uncoated HSS drills, coating delamination and abrasive are found to be the main flank and rake wear mode of the coated drills. The proposed research founds the base of the application of MoS2 metal composite coatings on dry drilling.     

MoSx/MoSx-Mo纳米多层膜的制备及其环境摩擦学特性

用直流磁控溅射在钢基体上交替溅射制备了MoSx/MoSx-Mo纳米多层膜。采用划痕仪测试薄膜与基体的结合力;采用SEM和XRD分析了纳米多层膜的形貌和显微结构;在球-盘式微摩擦试验机上测试了纳米多层膜在真空和潮湿空气中的摩擦学性能。结果表明,纳米多层膜的结合力优于纯MoS2膜。随着溅射沉积气压的升高,MoSx(002)面择优取向减弱,纳米多层膜的结合力下降。溅射气压0.24 Pa沉积的纳米多层膜在真空和潮湿空气中都呈现出最低的摩擦因数和磨损率,具有优异的环境摩擦磨损特性。