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。     

AS41镁合金在不同温度的摩擦学行为

研究了AS41镁合金在不同温度时的力学和摩擦学性能及摩擦学机理。研究结果表明:随着试验温度升高,AS41镁合金的抗拉强度和屈服强度降低、延伸率增大;当温度超过150℃时,抗拉强度和屈服强度显著下降。随着载荷增大,不同试验温度的摩擦因数均呈减小趋势,而磨损率则呈增大趋势;随着滑动速度增大,不同试验温度的摩擦因数变化不大,而磨损率则呈增大趋势。在不同载荷和滑动速度下,均呈现试验温度越高,摩擦因数越小,磨损率越大的现象;在试验温度较高时,导致磨损机制由轻微磨损向严重磨损转换的载荷减小。在载荷为50N时,不同温度AS41镁合金的磨损机理分别是:室温时主要为氧化磨损和磨粒磨损,150℃时为剥层磨损和黏着磨损,而200℃时主要为材料塑性变形引起的熔融磨损。     

PCrMo钢的摩擦磨损特性实验研究

采用自制的销盘式摩擦磨损试验机、光学及扫描电子显微镜，研究了PCrMo钢配副的干滑动摩擦磨损特性。结果表明：摩擦因数随着载荷的增加而增加，随着滑动速度的增加而减小；磨损率随着载荷的增加而增加，随着滑动速度的增加先增加而后降低。PCrMo磨损失效机理主要表现为疲劳剥落和粘着磨损。     

纳米SiO2颗粒和玻璃微珠共混改性超高分子量聚乙烯复合材料的摩擦磨损性能

采用模压成型工艺制备了纳米SiO2颗粒和玻璃微珠共混改性的超高分子量聚乙烯复合材料;研究了相对滑动速度、载荷以及玻璃微珠含量对复合材料摩擦磨损性能的影响,并对磨损形貌和磨损机理进行了分析。结果表明:添加纳米SiO2颗粒和玻璃微珠可以提高复合材料的硬度、压缩弹性模量和摩擦磨损性能;相对滑动速度对复合材料摩擦因数和磨损率有很大的影响;载荷对复合材料的摩擦因数影响不明显,但磨损率随载荷的增加而增大;纳米SiO2颗粒和玻璃微珠混合改性后复合材料的磨损机理主要是粘着磨损和疲劳磨损。     

磁场条件下钢轨材料的摩擦磨损性能试验研究

基于HSR-2M高速往复摩擦磨损试验机,试验研究在永磁体磁场条件下,法向载荷、往复速度等参数对钢轨材料摩擦性能的影响,通过磨痕形貌分析其磨损机制,并与无磁场条件下的结果进行对比。试验结果表明:磁场的引入可以在一定程度上减小钢轨材料的摩擦因数、磨损率;增大滑动速度对摩擦因数和磨损率均有减小作用,增大载荷能够降低摩擦因数,但磨损率增加;磁场能够提高钢轨材料在摩擦过程中的磨损性能。无磁场时,钢轨材料磨损形式为典型的磨粒磨损,摩擦系统的磨损率和摩擦因数较大;有磁场时,磨损形式主要为黏着磨损,摩擦因数和磨损率较小。     

永磁场条件下45钢与GCr15钢摩擦磨损性能试验研究

基于HSR-2M高速往复摩擦磨损试验机,研究在永磁体磁场条件下滑动速度、载荷等参数对45#钢/GCr15钢摩擦副摩擦学性能的影响,通过磨痕形貌分析其磨损机制,并与无磁场条件下的试验结果进行对比。试验结果表明:磁场的引入可以在一定程度上减小摩擦因数和降低磨损率,证明磁场能够改善45#钢/GCr15钢摩擦副的摩擦学性能;增大滑动速度将降低摩擦因数和磨损率,增大载荷将降低摩擦因数,增加磨损率。无磁场时,摩擦副的摩擦磨损为典型的磨粒磨损,磨损系统的磨损率和摩擦因数较大;有磁场时,磨损形式主要为黏着磨损,摩擦因数和磨损率较小。     

Ni-Mo-P-Si3N4化学镀层的摩擦磨损性能研究

Q215碳素钢表面上制备一层Ni-Mo-P-Si3N4复合镀层,在MS-T3000摩擦磨损试验机上进行摩擦磨损试验,记录平均摩擦系数,测试磨痕宽度,计算磨损率,研究该化学镀层的摩擦磨损性能。分析结果表明:载荷不变时,平均摩擦系数和磨损率均随滑动速度的增大而增大;滑动速度不变时,平均摩擦系数和磨损率均随载荷的增大而增大;载荷和滑动速度不变时,平均摩擦系数和磨损率随镀层中Si3N4的体积分数先增大后减小。     

铜锡铅锌合金的摩擦磨损性能

利用MMU-200型摩擦磨损试验机研究了铜锡铅锌合金与GCr15钢对磨时的摩擦磨损特性,利用扫描电子显微镜对合金的磨损表面形貌进行了观察。结果表明:铜锡铅锌合金的磨损率随载荷和摩擦速度的增加而增大;其摩擦因数随摩擦速度的增加而减小,随载荷的增加先增大后减小;其磨损机制主要为磨粒磨损和粘着磨损;合金中的铅相起到了润滑作用,有利于提高合金的耐磨性能。     

聚氨酯/Q235钢配副滚动摩擦磨损行为

采用自行研制的双盘摩擦磨损试验机对不同硬度聚氨酯与Q235钢组成的配副进行滚动摩擦磨损试验,探讨了载荷、转速以及聚氨酯的硬度对聚氨酯摩擦因数的影响,并研究了载荷和聚氨酯的硬度对聚氨酯磨损率的影响。结果表明:载荷对聚氨酯摩擦因数的影响较为明显,摩擦因数随着载荷的增大而减小;转速对聚氨酯摩擦因数的影响不大,也无明显的变化规律;随着聚氨酯硬度的升高,摩擦因数略有增大,但其变化幅度很小;磨损率随聚氨酯硬度的增大而减小,随载荷的增大而增大。     

受流条件下碳碳复合材料的摩擦学特性研究

以碳碳复合材料和铬青铜作为配副,研究了受流条件下碳碳复合材料的摩擦学特性.结果表明:速度、载荷和电流是影响受流条件下碳碳复合材料摩擦学特性的重要因素.在电流一定的条件下,碳碳复合材料的摩擦因数和磨损率随速度的增大而增大;摩擦因数随载荷的增加而增大,而磨损率随载荷的增加而减小.在载荷一定条件下,随着电流的增加,碳碳复合材料的摩擦因数减小而磨损率增大.与一般条件下的摩擦学特性相比较,碳碳复合材料在受流条件下的摩擦因数明显降低,而磨损率却明显提高.     

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.     

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.     

载流条件下的1Cr18Ni9Ti/浸金属碳摩擦磨损性能研究

在销-盘摩擦磨损试验机上试验了载荷、速度、电流对1Cr18Ni9Ti/浸金属碳对磨时的摩擦因数、磨损量及磨损形貌的影响。试验结果表明,载荷对1Cr18Ni9Ti/浸金属碳摩擦副的摩擦因数和销试样的磨损率有显著影响:载荷越大,摩擦因数越大,磨损率越低;摩擦因数、磨损率与速度的关系受载荷的制约。当低载时,以电流影响为主。销试样的磨损表面出现了粘着磨损,氧化磨损和电弧烧蚀。     

Tribological properties of Ni3Al-Cr7C3 composite coating under water lubrication

The tribological properties of Ni₃Al-Cr₇C₃ composite coating under water lubrication were examined by using a ball-on-disc reciprocating tribotester. The effects of load and sliding speed on wear rate of the coating were investigated. The worn surface of the coating was analyzed using electron probe microscopy analysis (EPMA) and X-ray photoelectron spectroscopy (XPS). The results show the friction coefficient of the coating is decreased under water lubrication. The wear rate of the coating linearly increases with the load. At high sliding speed, the wear rate of the coating is dramatically increased and a large amount of the counterpart material is transferred to the coating worn surface. The low friction of the coating under water lubrication is due to the oxidizing of the worn surface in the wear. The wear mechanism of the coating is plastic deformation at low normal load and sliding speed. However, the wear mechanism transforms to microfracture and microploughing at high load with low sliding speed, and oxidation wear at high sliding speed. It is concluded that the contribution of the sliding speed to an increase in the coating wear is larger than that of the normal load.     

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.     

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 Behavior of Steels under Different Reciprocating Sliding Conditions

The friction and wear behavior of ISO 100Cr6 steel ball sliding against conventionally hardened carbon and low-alloy steels was studied. The effect of hardness, hardening capacity, normal load, and sliding speed on the coefficient of friction and friction energy was investigated. Friction tests were carried out, without lubrication and under ambient conditions, on a reciprocating friction tester in which a ball-on-flat contact configuration was adopted. The results showed that there is a relative tendency for the friction properties to decrease with increased hardening capacity and decreased hardness. The results showed that increasing normal load decreases the coefficient of friction for the two steel nuances. However, increasing sliding speed increases the coefficient of friction of low-alloy steel and decreases the coefficient of friction of carbon steel. The oxidation of wear debris influences the wear mechanisms and friction behavior.     

腐蚀介质条件下NiCrBSi/WC喷熔层的摩擦学性能研究

采用氧-乙炔火焰喷熔工艺,制备了碳化钨颗粒增强镍基合金喷熔层(NiCrBSi/WC),研究了它在腐蚀介质条件下的摩擦磨损行为与机理,并考察了载荷、滑动速度对其摩擦磨损性能的影响规律。研究结果表明:NiCrBSi/WC具有良好的耐腐蚀磨损性能,且当WC含量为20%时,腐蚀磨损率最低;WC含量超过20%后,由于喷熔层存在“腐蚀原电池”效应,其腐蚀磨损率增大。NiCrBSi/WC的腐蚀磨损率随载荷增加而变大,随速度增大而减小。载荷的增加使喷熔层的犁削磨损加剧,导致摩擦系数和磨损率增大;速度的增大造成摩擦界面温度上升,可生成摩擦转移膜,从而降低了喷熔层的磨损率。