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为了提高AVIKO系列钢球检测系统中展开轮的服役寿命及检测精度,在增大表面摩擦因数的同时减少磨损,将表面微结构应用于展开轮,研究其摩擦磨损特性。利用激光在试件周向外表面加工三种不同直径参数的凹坑微结构,并用自主设计的摩擦磨损试验机进行试验,得到摩擦因数与磨损量,通过数值模拟得到应力分布图和磨损深度图,与光滑表面试件进行对比和分析。结果表明,在干滑动摩擦条件下,微结构表面试件均比光滑表面试件的摩擦因数更大且磨损量更小,微结构表面通过改变应力分布和分散磨损点位置减少了磨损并提高了耐磨性。所建立的数值模拟磨损模型可用于预测微结构表面磨损深度,为微结构表面展开轮的寿命预测提供了基础理论。 相似文献
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SiCp增强铝基复合材料与Kevlar增强摩擦材料摩擦副摩擦磨损机理研究 总被引:1,自引:0,他引:1
采用盘销式摩擦磨损试验机,对SiCp含量为20vol%的铝基复合材料和Kevlar增强摩擦材料组成的摩擦副在于摩擦条件下的摩擦磨损机理进行了实验研究。结果表明:摩擦副在跑合过程中,铝基复合材料中的SiCp颗粒对较软的有机复合材料产生犁削和微观切削效应,磨损机理为铝基复合材料的硬质颗粒对较软的有机复合材料的磨粒磨损;在跑合后的磨损试验中,摩擦材料磨损表面呈现出粘着磨损和塑性变形特征,随着转动速度的增加,塑性流动加剧;摩擦副接触表面发生材料的相互转移,并在铝基复合材料表面形成转移膜,且在较高速度下转移膜更易形成;在高速条件下,摩擦材料表面可见从铝基复合材料的铝合金基体中脱离的SiCp颗粒和熔融迹象;摩擦材料的磨损机理主要为磨粒磨损、粘着磨损和塑性变形。 相似文献
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在自行研制的高速列车制动缩比试验台上,对四种不同安装方向下的三角形摩擦块进行拖曳制动试验,研究了摩擦块的切入端特征对制动界面特性的影响,并采用有限元方法分析不同摩擦切入端特征下摩擦块的接触压力分布特点,探讨了摩擦块表面接触压力分布与其表面热分布、振动噪声特性的内在关联。结果表明:在摩擦制动过程中,摩擦块的切入端存在应力集中现象,尤其是当摩擦切入端是一个角的两条边时,摩擦切入端的角附近区域应力集中更为明显,从而引起制动系统产生高强度的振动噪声并导致摩擦块表面局部高温现象。 相似文献
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HIP-Si3N4陶瓷/45#钢副干摩擦和水润滑下摩擦学性能 总被引:2,自引:0,他引:2
利用MPX-2000型盘销式摩擦磨损试验机考察了HIP—Si3N4陶瓷/45^#钢副在干摩擦和水润滑下的摩擦磨损性能;用扫描电子显微镜观察了试件表面的磨损状态;采用X射线电子能谱仪分析了摩擦表面的化学成分:结果表明:干摩擦条件下,HIP—Si3N4陶瓷的磨损速率比45^#钢小,45^#钢发生粘着磨损,HIP—Si3N4陶瓷发生了脆性断裂和脱落;水润滑条件下,摩擦表面产生了Si(OH)4反应膜,降低了磨损,主要是化学腐蚀磨损。 相似文献
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采用多功能销-盘摩擦磨损试验机,开展铜基粉末冶金/Q235-B摩擦副的摩擦磨损试验,在载流和无载流的工况下,研究接触压力(0.4、0.7、1.0和1.3 MPa)对铜基粉末冶金材料闸片磨损表面形貌的影响。结果表明:在无载流工况下,随着接触压力的增大,摩擦因数和磨损率均缓慢上升,试样表面损伤加剧,粗糙度升高,主要的损伤机制为磨粒磨损和剥层;在载流工况下,0.4 MPa时的摩擦因数和磨损率最大,损伤最严重,粗糙度最高,当接触压力增大到0.7 MPa后,表面形貌损伤的变化趋势与无载流工况一致,磨损机制在磨粒磨损和剥层的基础上增加了电弧烧蚀;载流工况下材料表面的粗糙度普遍高于无载流工况下,表面损伤更为严重。 相似文献
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苯系列傅里叶变换红外(FT-IR)光谱的研究 总被引:2,自引:0,他引:2
从红外光谱学原理角度出发,将挥发性苯系列化合物的FT-IR谱图的性质加以分析,与仪器联用的计算机检索软件中的标准谱图进行了对比,列举了苯系列样品(色谱标准物)可能官能团的位置,并讨论了温度的影响。 相似文献
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Pícoli LC Dias FJ Issa JP Ogawa K Ciena A Iyomasa MM Lopes RA Watanabe IS 《Microscopy research and technique》2011,74(12):1154-1160
The fine structure of submandibular glands of mouse were analyzed using light microscopy (LM), high resolution scanning electron microscopy (HRSEM), and transmission electron microscopy (TEM) methods. For LM, the specimens were embedded in Spurr resin, stained by toluidin blue solutions. For TEM, the tissues of submandibular salivary glands were fixed with modified Karnovsky solution and postfixed with osmium tetroxide. For HRSEM, the tissues were fixed with 2% osmium tetroxide solution in 1/15M sodium phosphate buffer (pH 7.4). The samples were immersed successively in dymethylsulphoxide and freeze cracked. The maceration was made in diluted osmium tetroxide for 24-48 h. The samples were examined by high resolution scanning electron microscopy. The intracellular components of acinar and ductal cells revealed clearly the Golgi apparatus, rough endoplasmic reticulum, secretory granules, and mitochondria. The end bulbs of Golgi lamellae and flattened cisterns of rough endoplasmic reticulum showed the luminal surface. A few mitochondria were identified intermingling between the rough endoplasmic reticulum and the mitochondriales cristae in three-dimensional HRSEM images. Secretory granules were numerous and presented different sizes. Small granules of ribosomes were attached on cistern surface, measuring 20-25 nm in diameter. Numerous arranged microvilli were found on the luminal surface of secretory canaliculus. The contact surfaces of acinar cells revealed complicated interdigitations by cytoplasmic processes. The mitochondria of duct cells were disposed vertically and surrounded by basal infoldings of plasma membranes. Basement membrane showed a spongy-like structure having an irregular surface with various strands and meshes of fine collagen fibrils. 相似文献
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Three different low friction coatings on steel (electrolytically deposited cadmium, PTFE solid lubricant in epoxy resin and PTFE solid lubricant in polyimide resin) were studied in order to relate their fretting behaviour with mechanical properties. Particular importance was given to adhesion which was measured using a scratch test. Fretting tests were carried out on the steel substrate and on the coatings under the same conditions. The major parameters of the tribological system were identified and then quantified. The values of the parameters obtained for each coating were compared with the corresponding values for uncoated steel. The mechanical characteristics of the coatings and their fretting parameters were plotted using a polar diagram in order to give an overview of the fretting behaviour of each coating. Differences were noted and the corresponding parameters were identified. The influence of the adherence of the coating and of the fretting test load on the lifetime of the coating was determined. 相似文献
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关于我国摩擦学发展战略的初步思考 总被引:1,自引:0,他引:1
简要回顾了40年来摩擦学的发展历程,综述了近两年来摩擦学研究的最新进展和发展趋势以及英国摩擦学研究的现状。在此基础上,分析了摩擦学面临的挑战,并初步提出了我国摩擦学的发展战略。 相似文献