O'-sialon-ZrO2-SiC复合材料/不锈钢摩擦副的室温摩擦磨损性能研究

研究了Ｏ’－ｓｉａｌｏｎ－ＺｒＯ２－ＳｉＣ复合材料／不锈钢摩擦副的室温摩擦磨损性能。室 温干摩擦条件下,磨损机制以粘着磨损为主,Ｏ‘－ｓｉａｌｏｎ－ＺｒＯ２－ＳｉＣ复合材料的磨损率比不锈钢的低一个数量级,分形结果研究表明,随实验载荷的增加,磨损的加剧,材料对应的分形维数也变大,实验过程中,材料室温磨损的分形维数变化 在１．２８￣１．３８之间。     

Prallverschleiß

Impact abrasion. Our present knowledge concerning impact abrasion is surveyed. Impact abrasion of a wall is taken to mean its destruction as a result of collisions with solid particles. The article first presents a phenomenology of abrasion based on experimental studies and observations with a scanning electron microscope. Abrasion occurs in three phases: wear, lamellation, and destruction. Based on this phenomenology the wear of planar plates is examined as a function of the principal variables, i.e. the angle of incidence of the particles, their velocity, the duration of the experiment, concentration of solids in the particle beam, and the mechanical properties of the particles and the plate. Plate abrasion, which can be determined experimentally with relative case, serves as the starting point for a consideration of wear in pipe elbows. Differential analysis of the wear of curved surfaces is employed. The paper closes with a consideration of wear in components of equipment and machinery.     

润滑相MoS2对等离子喷涂Ni60A复合涂层摩擦学特性的影响

在UMT-2微观磨损试验机(USA)上研究了润滑相MoS2对等离子喷涂Ni60A复合涂层摩擦学特性的影响,且对摩擦表面进行了SEM观察和分析。研究结果表明:MoS2的引入能有效降低涂层的摩擦系数和提高耐磨性;未添加MoS2的涂层的主要磨损机理为磨粒磨损和疲劳磨损;添加MoS2的涂层的主要磨损机理为磨粒磨损和粘着磨损。     

旋流器磨损研究进展

介绍了旋流器磨损方面的研究进展,包括利用数值模拟、现场及实验室试验对水力旋流器壁面磨损位置、影响磨损的关键部位的结构参数和操作参数,以及为提高旋流器使用寿命对内衬材料和自身结构进行的改进,并对减缓旋流器壁面磨损的发展趋势作了简要分析。研究表明：旋流器不同位置的磨损率不同,可根据该情况设置耐磨层,在旋流器易磨损部位采用耐冲击磨损较佳的内衬材料,通过材料的差异化提高旋流器耐磨性能或者在旋流器靠近壁面位置引入其它结构而改变该区域流体流动情况,减缓旋流器壁面磨损。随着人们对旋流器壁面磨损的不断开发,其在石油、化工等行业得到了越来越广泛的应用,减缓旋流器壁面磨损,提高其耐磨性能,对工程应用具有实用意义。     

物料冲蚀对耐磨材料影响的试验研究

破碎机、磨机、篦冷机、旋风筒和输送管道等设备,在进行物料粉碎、输送和选粉过程中,其零部件表面因受物料的摩擦和撞击,会发生冲蚀磨损。根据磨损理论,产生磨损的主要因素为设备本身材质、物料性能、所处环境和输入能量这四种。德国AG公司使用冲蚀磨损试验装置,以不同的冲蚀角、不同的冲蚀速度和不同混合比的料流冲击试验样,测试了不同耐磨材料的磨损率;并对磨损数值进行了分析比较。试验表明,不同的耐磨材料有不同的适用范围。故选用前,应了解所破碎或输送物料的磨损特性和磨损类型,并分析料流的负载、方向和速度。这样才能在设备设计和使用时采取相应措施,以减少磨损,延长设备寿命。     

玻璃钢车削用刀具磨损研究

玻璃钢车削用车刀磨损的主要原因之一为切削热磨损，本文主要分析介绍了用车刀切削玻璃钢材料刀具磨损的主要原因，并介绍为解决刀具磨损几种常用的车刀刃磨方式。     

外界条件下硫化胶的磨耗性能研究

采用热氧老化处理硫化胶,发现硫化胶的磨耗体积随着热氧老化时间的延长而大大增加;相比常温磨耗,高温磨耗下的各填充分数的硫化胶耐磨性变差;胶料与砂轮间的对磨角度越大,硫化胶的磨损程度越大;磨耗体积随着磨耗里程的增加基本成线性增加;有磨耗介质参与的硫化胶磨耗体积大大减小。     

聚脲弹性体材料耐磨性能的探讨

由不同二元醇与二异氰酸酯合成不同NCO含量的半预聚体(A组分)与端氨基聚醚、胺扩链剂等原料组成的R组分经喷涂设备喷涂成型聚脲弹性体。讨论了在不同摩擦工况下NCO含量、异氰酸酯指数、预聚物类型、耐磨助剂等对聚脲弹性体耐磨性能的影响。结果表明,不同NCO含量在不同摩擦工况下对聚脲耐磨性能的影响不同,干摩擦工况下NCO含量越高,耐磨性能越佳,湿摩擦工况下则是NCO质量分数为15%耐磨性最佳,异氰酸酯指数对聚脲耐磨性能的影响较小,使用聚四氢呋喃二元醇、TDI预聚物和耐磨助剂,可提高不同摩擦工况下聚脲的耐磨性能。     

Segment wear characteristics of diamond frame saw when cutting different granite types

An experimental study was carried out to determine the influence of rock properties on segment wear during the cutting of granite using an innovative diamond frame saw prototype. Wear is the main cost of frame saws with diamond-impregnated segments. Ten different granite types with a large market demand were cut by a stone-processing company. The diamond segment topography was studied. The microscopic appearance and a statistical analytical method were used to study the wear characteristics. The main diamond particle abrasion types are whole and micro-fractured crystals. No polished diamond particles resulted from using the frame saw prototype cutting stone. The frame saw cuts only in a half-cycle within a reciprocating stroke. The principal wear mechanisms of the diamond particles and the matrix are impact abrasion and flushing abrasive erosion, respectively. The statistical analysis indicated that uniaxial compressive strength, bending strength and quartz content were the first three rock properties that affected segment wear. The developed mathematical model can predict segment wear for manufacturers and users.     

马氏体钢动载磨料磨损特性的研究

在MLD－10型动软磨损试验机上，选用20Cr、40Crsi、T8、T10四种马氏体钢作为上试样，选用20Cr、40Crsi、T10三种马氏体钢作为下试样进行不同配副性的冲击磨损试验结果表明：马氏体钢配副性的变化，改变了磨料对材质的作用方式，使磨损机理发生了变化，从而导致了耐磨性的变化,在冲击功为1.0J的条件下，固溶碳量高的T10高碳马氏体钢相互配到时，系统的耐磨性最佳     

Method for the characterization of the abrasion induced nanoparticle release into air from surface coatings

A novel method for the quantification of the nanoparticle release into air from surface coatings was developed. The method is based on the combination of a defined abrasion process with highly sensitive methods to quantify airborne particle concentration. A standardized system for abrasion testing was employed to adjust a defined wear process.Details of the abrasion system are presented in combination with a downstream aerosol measurement technique (scanning mobility particle sizer, SMPS and condensation particle counter, CPC) which focuses on the quantification of a release rate from particles smaller than 100 nm. The interconnection between the aerosol measurement system and the abrasion process is described in detail.After the proof of sensitivity of the measuring system first measuring results of abraded surface coatings revealed a reasonable reproducibility of the generated wear particles in terms of total mass and a rather weak reproducibility in terms of the total number concentration. However, the total number of generated submicrometer particles or nanoparticles was extremely low and laid below the statistic significance threshold.     

立式辊磨耐磨材料的优化设计和应用

我国正在运行和今后可能投入使用的立式辊磨数量惊人,市场前景巨大.而作为立磨耐磨部件的耐磨材料消耗也是非常可观,用量很大.分析了立磨零部件的磨损主要有喷射磨损、挤压磨损和摩擦磨损三种,逐一介绍了这三种磨损的部位和耐磨材料的设计选择,并对立磨耐磨材料今后的发展方向作了分析.     

Abrasion studies of nylon 6/montmorillonite nanocomposites using scanning electron microscopy,fourier transform infrared spectroscopy,and X‐ray photoelectron spectroscopy

In this article, abrasion performance of commercial nylon 6 and nylon 6/montmorillonite (MMT) nanocomposites was studied. The polymer nanocomposites showed poor abrasion resistance compared to the neat polymer. The wear loss increased linearly with clay concentration. Changes in surface morphology, composition, and structure were investigated by scanning electron microscopy (SEM), Fourier transform infrared (FTIR)‐attenuated total reflection spectroscopy, and X‐ray photoelectron spectroscopy (XPS). SEM images showed that all the abraded surfaces contained fractured particles. However, the abraded nanocomposite surfaces had much deeper grooves compared to the homopolymer. FTIR results showed an increase in the amount of α crystals and a decrease in the amount of γ crystals on all the surfaces after abrasion. This was attributed to the strain‐induced γ to α crystal transformation. The largest amount of α crystals was formed in the abraded surface of pure nylon 6, and the amount of α crystals formed decreased with increasing MMT content. XPS results showed an increase in the [Si]/[N] elemental ratio for all nanocomposites after abrasion, indicating an increase in the clay content of the surface. Abrasive wear mechanism is as follows: (1) tensile tearing is the dominant wear mechanism for all the samples; (2) the cutting mechanism becomes more important when MMT content increases; (3) the polymer matrix is easier to be removed than clay during the abrasion process; (4) in nylon 6/MMT systems, the poor abrasion resistance is attributed to defects at the clay‐polymer interface, resulting in greater wear of the polymer matrix. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

芳纶浆粕增强丁腈橡胶复合材料的摩擦磨损性能

利用开炼机制备了丁腈橡胶(NBR)/芳纶浆粕(PPTA-pulp)复合材料。研究了在干摩擦和水润滑条件下,纤维含量、摩擦时间以及载荷对NBR/PPTA-pulp复合材料摩擦磨损性能的影响,并分析了磨损机理。结果表明,芳纶浆粕的加入能够很好地改善复合材料的力学性能和摩擦磨损性能,在相同条件下,当纤维质量分数为20%时,复合材料的综合性能最佳;在干摩擦条件下,随着摩擦时间延长,复合材料的摩擦系数下降,磨耗量增大;随着载荷增加,摩擦系数和磨耗量增大;水润滑条件下,复合材料的摩擦系数和磨耗量较干摩擦大幅度降低且比较稳定,时间和载荷对其影响很小;干摩擦时,复合材料的磨损机理主要为磨粒磨损和疲劳磨损;水润滑时,主要为轻微磨粒磨损。     

镁合金化学镀Ni-Cu-P合金耐磨性研究

在AZ91D镁合金上直接化学镀Ni-Cu-P合金,得到了均匀、致密的镀层,有良好的结合力,其耐磨试验结果表明:Ni-Cu-P镀层的磨损量仅为基体的43%。X-射线衍射图表明热处理后,Ni-Cu-P合金镀层结构发生了变化,耐磨性有所提高,其磨损量仅为基体的15%。     

无溶剂液体环氧涂层耐磨性的研究

通过对无溶剂液体环氧涂层耐磨性的研究,验证了影响环氧涂层耐磨性的主要因素是耐磨填料、固化剂种类和涂层的固化程度。     

Corrosion and wear resistant electrodeposited composite coatings

Composite electroplating is a method allowing to co-deposit fine particles of metallic or non metallic compounds into the plated layers in order to improve the surface properties. The aim of the present work was to compare the performance of pure nickel and Ni-SiC nano-structured composite coatings as far as corrosion, wear and abrasion resistance were concerned. The characteristics of the coatings were assessed by scanning electron microscopy, micro hardness test, Taber Abrader test, electrochemical impedance spectroscopy and wear corrosion measurements. Additionally accelerated salt spray tests were performed. The results obtained in this study indicate that the co-deposition of nickel and SiC nano-particles leads to uniform deposits possessing better abrasion, wear and corrosion properties.     

遥传脉冲器磨损机理研究

遥传脉冲器转子在使用过程中存在磨损现象,这些磨损直接导致泥浆脉冲器无法实现随钻仪器采集的各种井下参数的上传。根据泥浆脉冲器转子本体磨损标准,分析泥浆脉冲器转子橡胶材质的性能、泥浆中岩屑摩擦以及外围部件缺陷所导致的泥浆脉冲器转子磨损。从设备管理过程中增加动平衡测试、改进橡胶性能、改进生产到应用过程中橡胶的存放等方法被提出,这些方法有助于降低磨损风险。研制了新型金属耐磨套替换方案,水循环和角度测试表明新型泥浆脉冲器转子性能明显改进。     

四种环氧胶粘涂层磨粒磨损性能研究

在环氧树脂胶粘涂层中加入填料,可提高其耐磨粒磨损性能。配制四种不同的胶粘涂层,通过改变磨料的粒度和磨损行程对其进行磨粒磨损性能测试。推荐了具有较好耐磨粒磨损能力的环氧树脂纳米胶粘涂层的最佳配方,为其在胶粘领域推广应用积累基础数据。     

无釉砖和有釉砖耐磨性标准的统一化探析

耐磨性是陶瓷砖的一项关键性能指标,目前GB/T 4100—2015《陶瓷砖》规定无釉砖和有釉砖采用不同的试验方法.利用耐深度磨损试验机、陶瓷砖釉面耐磨试验机和Taber试验机对无釉砖和有釉砖进行耐磨性的测定,研究同一种试验方法是否能同时对两种陶瓷砖作精确的评判.结果表明,无釉砖耐磨深度法和Taber耐磨试验法可通过磨损...