铜碲硒铁合金的干摩擦磨损性能

利用环-盘式摩擦磨损试验机研究了铜碲硒铁合金的干摩擦磨损行为,分析了载荷和摩擦速度等参数对该合金摩擦磨损性能的影响,并用扫描电子显微镜对磨损形貌进行了观察.结果表明:铜碲硒铁合金的摩擦因数随载荷的增加变化不大,但随摩擦速度的增加而明显增大;合金的磨损率随载荷和摩擦速度的增加均增大;在轻载低速条件下,合金的磨损机制以犁削磨损和粘着磨损为主;在重载高速条件下,磨粒磨损和粘着磨损加剧.     

38CrSi自配副的摩擦磨损性能

采用自制的销盘式摩擦磨损试验机研究了38CrSi自配副干滑动时的摩擦因数、磨损率随滑动速度和载荷的变化规律;利用SEM观察了磨损面的微观形貌,分析了摩擦磨损机理。结果表明：其摩擦因数随着载荷和速度的增加而减小;磨损率随着载荷的增加而增大,随着速度的增加先增大后减小,和常用材料的磨损率随速度增加而增大的规律不同;磨损机理为磨粒磨损和粘着磨损。     

38CrSi自配副的摩擦磨损性能

采用自制的销盘式摩擦磨损试验机研究了38CrSi自配副干滑动时的摩擦因数、磨损率随滑动速度和载荷的变化规律;利用SEM观察了磨损面的微观形貌,分析了摩擦磨损机理。结果表明:其摩擦因数随着载荷和速度的增加而减小;磨损率随着载荷的增加而增大,随着速度的增加先增大后减小,和常用材料的磨损率随速度增加而增大的规律不同;磨损机理为磨粒磨损和粘着磨损。     

铜镍锡合金干滑动磨损行为研究*

大型装备上的铜镍锡合金工件常常工作在润滑不足或者无润滑的工况条件下,因此有必要研究铜镍锡材料在干摩擦下的性能。采用CEF-I型销-盘式磨损试验机对铜镍锡合金在不同载荷与转速条件下进行干滑动摩擦磨损试验,采用扫面电子显微镜、能谱仪和轮廓检测仪对磨损表面进行检测,研究铜镍锡合金的干滑动磨损行为,并探讨其磨损机制。结果表明：在转速一定时,平均摩擦因数随载荷增大总体呈波动下降趋势,铜镍锡合金试件磨损量先缓慢增加,在较高载荷下快速增加;在载荷一定时,平均摩擦因数随转速增大先增大后减小,铜镍锡合金试件磨损量总体呈先减小后增大趋势;随着载荷的增大,铜镍锡合金的磨损机制由轻微黏着和剥层磨损到明显的黏着和剥层磨损,再到严重的黏着和疲劳磨损,随着转速的增大,铜镍锡合金的磨损机制由磨粒磨损转变为黏着磨损再到剥层磨损。在较低载荷下,随着转速的增大,铜镍锡合金摩擦磨损性能保持很好的稳定性,因此铜镍锡合金适用在高转速较低载荷的干摩擦工况下。     

高速摆动下PTFE编织复合材料干摩擦研究

利用高速摩擦试验机对PTFE编织复合材料进行干摩擦试验,研究不同条件(载荷、速度和湿度)下PTFE编织复合材料干摩擦磨损性能;并利用扫描电子显微镜对不同条件下的磨屑形貌进行分析。结果表明:单因素变化条件下,摩擦因数随载荷和相对湿度的增大而减小,随摩擦速度的增大而增大;磨损量随载荷和速度的增大而增大,但相对湿度的增加可降低磨损;载荷及速度的增加显著影响材料磨损状况。     

浸金属碳滑板/铜银合金接触线载流摩擦磨损性能的试验研究

选取地铁刚性接触网中现役的浸金属碳滑板与铜银合金接触线为接触副,模拟地铁弓网的实际运行状况,在环-块式试验机上研究直流电流为200~400 A、法向载荷为15~40 N、滑动速度为40~120 km/h工况下浸金属碳滑板载流摩擦磨损性能。结果表明：摩擦因数随电流和滑动速度的增大而减小,随法向载荷的增大而增大;磨损量随电流和滑动速度的增大而增大,当电流较小时（如200 A）,磨损量和法向载荷之间存在一个阈值,当电流较大时（如400 A）,磨损量随法向载荷的增大而减小;滑板温度随电流的增大而增大,随法向载荷增大而减小,当电流较小时（如200 A）,滑板温度随速度的增大而增大,当电流较大时（如400 A）,滑板温度随速度的增大而减小;当电流为200~300 A时,其磨损机制主要为机械磨损,当电流为300~400 A时,其磨损机制主要为氧化磨损和电弧烧蚀。     

旋耕机旱地刀的摩擦磨损性能试验研究

利用HSR-2M高速式往复摩擦磨损试验机,试验干态条件下,往复速度、法向载荷和往复行程等对旋耕机旱地刀的摩擦因数和磨损量的影响,通过磨痕形貌分析其磨损机制。试验结果表明：摩擦因数均随往复速度和法向载荷的增大而减小;磨损量则随往复速度的增大先减小后增大,且随法向载荷和往复行程的增大而增大;干态条件下,磨损机制主要以磨粒磨损为主。     

聚四氟乙烯工程材料的摩擦磨损性能研究

用MPV-200型摩擦磨损试验机研究了干摩擦条件下磨损时间、滑动速度、载荷、填料等对聚四氟乙烯(PTFE)工程塑料摩擦磨损性能的影响，结果表明：PTFE材料的摩擦因数和磨损率先随速度的增大而减小，然后又随着速度的增大而增大；随磨损时间的增长而降低，最后趋于稳定值；另外，摩擦因数大体上随载荷的增大而减小，磨损量则随载荷的增大而增加；填料可将PTFE的磨损量降低2个数量级，其中石墨使PTFE的摩擦因数降低，玻璃纤维和碳纤维则增大了PTFE的摩擦因数，而MoS2对PTFE摩擦因数的影响较小。对PTFE工程塑料的摩擦磨损特性进行系统分析，为优化设计提供理论基础。     

Inconel718与硬质合金摩擦磨损特性的实验研究

利用UMT-2多功能摩擦磨损试验机对镍基合金Inconel 718与硬质合金刀具对偶时的摩擦磨损特性进行研究,揭示法向载荷和滑动速度对摩擦副摩擦因数的影响,通过SEM观察试样摩擦形貌并分析磨损机制.研究结果表明:摩擦副的摩擦因数随着法向载荷的增大而减小,随滑动速度的增大而增大;Inconel 718镍基合金与硬质合金对偶时的磨损机制主要为黏着磨损、磨粒磨损和氧化磨损.     

旋耕机湿地弯刀的摩擦磨损性能试验研究

利用HSR-2M高速式往复摩擦磨损试验机,研究湿态条件下,湿地弯刀表面粗糙度、往复速度和法向载荷等对旋耕机湿地弯刀摩擦因数和磨损量的影响,并通过磨痕形貌分析其磨损机制。试验结果表明:摩擦因数和磨损量随着旋耕机湿地弯刀表面粗糙度的增大而增大;磨损量随法向载荷的增大而增大,而随往复速度的增大先减小后增大;摩擦表面温度随着法向载荷和相对运动速度的增大而增大;湿态条件下湿地弯刀的磨损机制以磨粒磨损为主,局部有点蚀现象出现。     

Tribological Behaviors of Self-lubricating Coating Prepared by Electrospark Deposition

Cu/h-BN self-lubricating coating was prepared on AISI1045 steel by electrospark deposition. The friction coefficient and wear rates were measured using the ball-on-disk method, and the tribological behaviors were discussed. Results showed that the friction coefficient decreased with an increase in sliding speed and load. The wear rate decreased with an increase in sliding speed and increased with an increase in load. The self-lubricating coating exhibited much lower friction coefficient and wear rate than the uncoated mild steel under the test condition. SEM micrographs show that the main wear mechanisms of the self-lubricating coating are abrasive wear and fatigue wear.     

Tribological properties of flame sprayed Fe–Ni–RE alloy coatings under reciprocating sliding

Fe–Ni–RE self-fluxing alloy powders were flame sprayed onto 1045 carbon steel. The tribological properties of Fe–Ni–RE alloy coatings under dry sliding against SAE52100 steel at ambient conditions were studied on an Optimol SRV oscillating friction and wear tester in a ball-on-disc contact configuration. Effects of load and sliding speed on tribological properties of the Fe–Ni–RE coatings were investigated. The worn surfaces of the Fe–Ni–RE alloy coatings were examined with a scanning electron microscopy(SEM) and an energy-dispersive spectroscopy(EDS). It was found that the Fe–Ni–RE alloy coatings had better wear resistance than the SAE52100 steel. An adhered oxide debris layer was formed on the worn surface in friction. Area of the friction layer varied with variety of sliding speed, but did not vary with load. The oxide layer contributed to decreased wear, but increased friction. Wear rate of the material increased with the load, but dramatically decreased at first and then slightly decreased the sliding speed. The friction coefficient of the material was 0.40-0.58, and decreased slightly with the load, but increased with sliding speed at first, and then tended to be a constant value. Wear mechanism of the coatings was oxidation wear and a large amount of counterpart material was transferred to the coatings.     

Friction and wear properties of short carbon fiber reinforced aluminum matrix composites

The friction and wear properties of short carbon fibers (SCFs) reinforced aluminum matrix composite were studied. The influences of the fiber volume fraction, load applied, rotating speed, and wear mechanism were discussed. The results indicated that SCFs/Al composite had better tribological properties than Al alloy. The friction coefficient and wear mass loss decreased with the fiber volume fraction increased, but increased as the load and rotating speed increased, respectively. SCF reduced direct contact between the matrix and counterpart and improved the wear resistance of SCFs/Al composite greatly. The wear displayed a linear evolution in all the range of load. Surfaces before and after wear tests were characterized using scanning electron microscopy (SEM) and energy-dispersive analysis of X-ray (EDAX) spectroscopy.     

Tribocorrosion behavior of Ni-17.5Si-29.3Cr alloy in sulfuric acid solution

The tribocorrosion property of a Ni-17.5Si-29.3Cr alloy against a Si₃N₄ ball was studied in comparison with AISI321 stainless steel using a ball-on-disk reciprocating tribotester in 1 M sulfuric acid (H₂SO₄) solution. The effects of load and sliding speed on the tribocorrosion properties of the alloy were investigated. The results indicated that the wear rate of the alloy increased while the friction coefficient decreased with increasing load. The wear rate of the alloy increased linearly with increasing sliding speed and the friction coefficient increased in the initial stages and then remained constant with increasing sliding speed. The wear mechanisms were mainly microploughing, uniform corrosion and pitting corrosion. Under the experimental conditions of the present study, the Ni-17.5Si-29.3Cr alloy showed excellent corrosion-resistence and anti-wear ability compared with AISI321 stainless steel.     

Friction and wear behavior of Ni-P coated Si3N4 reinforced Al6061 composites

Al6061 matrix composite reinforced with nickel coated silicon nitride particles were manufactured by liquid metallurgy route. Microstructure and tribological properties of both matrix alloy and developed composites have been evaluated. Dry sliding friction and wear tests were carried out using pin on disk type machine over a load range of 20-100 N and sliding velocities of range 0.31-1.57 m/s. Results revealed that, nickel coated silicon nitride particles are uniformly distributed through out the matrix alloy. Al6061-Ni-P-Si₃N₄ composite exhibited lower coefficient of friction and wear rate compared to matrix alloy. The coefficient of friction of both matrix alloy and developed composite decreased with increase in load up to 80 N. Beyond this, with further increase in the load, the coefficient of friction increased slightly. However, with increase in sliding velocity coefficient of friction of both matrix alloy and developed composite increases continuously. Wear rates of both matrix alloy and developed composites increased with increase in both load and sliding velocity. Worn surfaces and wear debris was examined using scanning electron microscopy (SEM) for possible wear mechanisms. Energy dispersive spectroscope (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscope (XPS) techniques were used to identify the oxides formed on the worn surfaces and wear debris.     

Ti6Al4V/WC-Co干摩擦性能研究

利用Optimal SRV高温摩擦磨损试验机,研究干摩擦条件下钛合金(Ti6Al4V)对硬质合金(WC-Co)的摩擦学性能.研究了载荷、温度与滑动速度对摩擦过程的影响,通过磨损区微观形貌表征分析了磨损机理.结果表明:Ti6Al4V与WC-Co的摩擦系数波动剧烈,产生了严重的黏滑摩擦,且随着载荷、温度与滑动速度的增加,黏...     

Friction and wear properties of Babbitt alloy 16-16-2 under sea water environment

The tribological behaviors of Babbitt alloy 16-16-2 sliding against aluminum bronze ZCuAl9Mn2 lubricated by sea water were systematically investigated in this paper. The results indicated that the friction coefficient decreased as the load increased to 30 N and then remained at a steady level at high loads, but decreased with increase in sliding speed. The wear rate increased with load, but decreased with sliding speed. The formation of basic lead carbonate Pb₃(OH)₂(CO₃)₂ during the sliding process played a critical role in the remaining low friction coefficient in sea water.