共查询到19条相似文献,搜索用时 140 毫秒
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纯铜双层辉光离子渗钛高温氧化性能的研究 总被引:6,自引:0,他引:6
采用双层辉光离子渗金属技术,在纯铜表面形成均匀的渗钛层.对离子渗钛试样和纯铜试样在400℃和700℃进行了高温氧化对比实验,分别给出了它们的氧化动力学曲线,用扫描电子显微镜观察分析氧化表面形貌,结果表明纯铜表面离子渗钛后提高了高温抗氧化的性能,降低了氧化速率,离子渗钛层的氧化膜致密,对继续氧化有阻碍作用。 相似文献
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研究了阴极电弧离子渗钛对316L不锈钢摩擦学性能的影响。结果表明:利用阴极电弧离子渗金属技术在316L不锈钢表面制备的渗钛层峰值钛含量为66%(质量分数),渗钛层主要由Fe_2Ti和Ni Ti相组成,渗层与基体结合牢固;表面硬度由基体的2000 MPa提高到了4000 MPa,硬化层深度约为150μm;在干摩擦条件下,渗钛的不锈钢样品摩擦系数明显低于未渗钛样品,磨损率降低到未渗钛样品的1/7。未渗钛样品的磨损机制为磨料磨损、氧化磨损和粘着磨损,渗钛样品的磨损主要是渗层局部剥落引起的。 相似文献
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通过对不同温度铬钛共渗得到的化合物层进行成分分析和相结构分析,探讨了温度对化合物层成分和相结构的影响及其机理。研究表明,在900℃以上共渗,可获得钛碳和铬碳化合物的复合共渗化合物层。 相似文献
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采用双层辉光离子渗金属技术,在T10钢表面进行渗钛,研究了渗钛层的显微组织和摩擦磨损性能。利用超景深三维显微系统、X射线衍射仪、显微硬度计、能谱仪等分别对渗钛层的组织、相结构、硬度及元素的浓度分布进行检测和分析,用MM-W1万能摩擦磨损试验机研究了渗层的摩擦磨损性能。结果表明:T10钢双辉渗钛后可在表面形成均匀、致密且与基体结合良好的TiC层,渗钛层硬度达到1 100HV0.01以上,且呈平缓的梯度下降。与未处理的T10钢相比,渗钛层的磨损率明显降低,耐磨性增强。 相似文献
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钛催渗盐浴氮碳共渗对H13表面性能的影响 总被引:1,自引:1,他引:0
研究了钛催渗对H13钢盐浴氮碳共渗的影响,分别就盐浴处理温度和时间等工艺参数对试样表面性能影响进行了研究。试验结果表明,钛催渗剂的多少对共渗层表面硬度具有显著影响,钛催渗可显著缩短盐浴处理时间,有效提高渗层厚度和硬度,能得到质量良好的渗层。 相似文献
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DIFFUSION TITANIZING is applied to increase thedurability of tools,which operate under wearconditions[1].There is considerable bibliographicaldata concerning the diffusion titanizing process,inparticular,problems connected with hard titaniumcarbide layers are quite well elaborated[2-4].In this paper,a novel vacuum titanizing process,which involves treating steel in titanium vapor at thetemperature over1000°C under low pressure,has beenproposed[5].A porous material containing titaniumw… 相似文献
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为了提高纯铜表面的耐磨性能,采用电镀/浆料包渗相结合的方法,以TiO2粉为渗Ti源,纯Al粉为还原剂,在Cu表面预镀Ni随后表面浆料包渗Ti-Al,制备Ti-Al共渗层。研究了包渗温度对Ti-Al渗层组织和耐磨性能的影响。采用SEM和XRD分析了渗层表面形貌和结构。结果表明:在800~950°C共渗12 h时,随着温度的升高,渗层组织变化过程为NiAl+Ni3(Ti,Al)→NiAl+Ni3(Ti,Al)+Ni4Ti3→Ni4Ti3+NiAl→NiAl+Ni3(Ti,Al)+NiTi;Ti-Al渗层的摩擦因数随着包渗温度的升高而降低,最小摩擦因数约为纯铜的1/3,最小硬度为纯铜的5倍。 相似文献
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Up to now, the aluminide coatings used to protect industrial components at high temperature and corrosive environments have been modified by Pt, Cr, Si and Ni. In this investigation, aluminide coatings were modified by titanium and the microstructural feature and formation mechanism were evaluated. The coatings were formed on a Ni-based superalloy(IN738LC) by a two stage process including titanizing at first and aluminizing thereafter. Pack cementation titanizing performed at temperatures 950℃ and 1050℃ in several mixtures of Ti, Al2O3 and NH4Cl. At the second stage,aluminum diffused into surface of the specimens by an industrial aluminizing process known as Elcoatl01(4 hrs at 1050℃C). The modified coatings were characterized by means of standard optical microscopy, scanning electron microscopy,energy dispersive spectroscopy and X-Ray diffraction methods. The results show that Ti in the coatings is mainly present in the form of TiNi and Al67CrsTi25. Titanium modified coatings grew with a mechanism similar to simple aluminizing; this includes inward diffusion of Al from the pack to the substrate and then outward diffusion of Ni from the substrate to the coating. The advantages and characteristics of this two-stage modified coating is discussed and the process parameters are proposed to obtain a coating of optimum microstructure. 相似文献