La2O3填充PA1010复合材料的摩擦磨损性能

采用热挤压方法制备了不同La2O3含量的尼龙1010（PA1010）复合材料。测定了复合材料的密度和硬度,在MM－200型环－块试验机上考察了其摩擦磨损性能。用光学显微镜观察了材料表面磨痕和转移膜形貌。结果发现：La2O3能显著改善PA1010的摩擦学性能,尤其是填充量为15％的PA1010复合材料减摩耐磨性能最佳,其摩擦系数从未填充的0．87降到0．33,磨损率降低近1数量级。PA1010的磨损主要表现为严重犁削、粘着、疲劳和塑性变形,其转移膜不均匀,且有脱落现象。PA1010－15％La2O3复合材料的磨损主要表现为轻微犁削,其转移膜薄而致密,且均匀光滑。这与二者的耐磨性能相一致。     

Al2O3P/ZA27复合材料的高温摩擦磨损特性

借助SRV高温摩擦磨损试验机、SEM及能谱分析仪研究了Al2 O3p/ZA2 7复合材料的高温摩擦磨损特性。结果表明 :在边界润滑条件下 ,Al2 O3p/ZA2 7复合材料的高温磨损质量损失较ZA2 7合金降低 0 .0 0 5 34g ;摩擦因数随着增强颗粒体积分数的增加而降低 ,当增强颗粒的体积分数由 10 %增加到 30 %时 ,Al2 O3p/ZA2 7复合材料的摩擦因数由 0 .142降低到 0 .132 ,但均高于ZA2 7合金。其高温失效形式为犁削和疲劳磨损。     

双尺度Al_2O)3颗粒增强铝基复合材料的组织和性能

通过粉末冶金真空热压烧结法制备了双尺度(nm、μm)混杂Al2O3颗粒增强铝基复合材料,并对复合材料的组织、密度、硬度及耐磨性进行了研究。结果表明,双尺度复合材料中增强颗粒在基体中分布均匀,没有明显的团聚现象,微米颗粒含量超过20%时,复合材料的空隙增多;4%的30nm颗粒+15%的75μm颗粒的双尺度复合材料的性能最好,其硬度比基体Al-Si合金提高70%,耐磨性比基体铝硅合金提高7.22倍;双尺度混杂颗粒复合材料的耐磨性高于单一纳米或微米颗粒复合材料,其磨损机制主要为粘着磨损、犁削和磨粒磨损。     

Yb添加量对非晶态化学镀Ni-Yb-P镀层耐磨性能的影响

采用化学镀方法制备了非晶态Ni-P和Ni-Yb-P镀层,研究了稀土元素Yb添加量对镀层硬度和耐磨性能的影响。结果表明,Ni-Yb-P镀层的硬度随着Yb添加量的增加而提高,当镀液中YbN3O9.5H2O的添加量为200mg/L时,镀态下镀层的耐磨性能最佳。磨损试验发现,镀态下非晶态Ni-P镀层的磨损机制为粘着磨损和犁削磨损,其耐磨性能较差;随着稀土添加量的增加,镀层耐磨性能提高,但稀土添加量过高时,镀层耐磨性能又会下降。     

粉末注射成形制备SiCP/Cu复合材料及其摩擦磨损性能研究

采用粉末注射成形技术制备SiCP/Cu复合材料零件,研究了该复合材料的粉末注射成形工艺过程,获得了理想SiCP/Cu复合材料注射成形零件,并对该复合材料进行摩擦磨损试验.结果表明,SiCP的加入改善了材料的摩擦学性能,摩擦系数随滑动时间的延长而增加得较为平缓;含10％SiCP的复合材料磨损表面的粘着和塑性变形程度轻,有一定的磨粒磨损;含15％SiCP的该复合材料磨损表面呈典型磨粒磨损;该复合材料磨损表面存在白亮色的致密机械混合层,同时磨损试验的偶件40Cr钢环表面也被犁削而形成了平行的条纹;该复合材料磨损表面含有Cu、Si、C、Fe和O元素,这增加了钢环表面转移过来的Fe元素和表面摩擦发热造成的氧化而带来的O元素.     

晶须CaCO3和PTFE填充聚醚醚酮复合材料的摩擦学性能

用MM200磨损试验机和45钢环配副,研究不同含量碳酸钙(CaCO3)晶须和10%的聚四氟乙烯(PTFE)共同填充聚醚醚酮(PEEK)复合材料的摩擦磨损性能,用扫描电镜观察磨损表面形貌并分析磨损机理。结果表明,随着复合材料中晶须含量增加,摩擦系数持续降低,最低可降到纯PEEK的1/2;复合材料的磨损率随晶须含量的增加先大幅度减小后又缓慢回升,当晶须含量为15%-20%时,磨损率降至3.3×10-7mm3/Nm,仅为纯PEEK的3.6%,20?CO3/10%PTFE/PEEK综合摩擦学性价比较好。CaCO3晶须增强PEEK减少了复合材料在摩擦过程中摩擦副表面粘着和剥层,阻止基体树脂的热塑性变形,同时PTFE的优先粘着转移使得复合材料在对偶件表面形成连续、均匀的转移膜,两者协同有效降低摩擦系数和磨损率,提高材料的摩擦学性能。     

La2O3对EXD602-WC烧结涂层组织与性能的影响

采用热压烧结技术在45钢基片表面制备50EXD602-50WC复合涂层,利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)进行组织观察、成分以及物相分析,研究了La2O3对涂层组织、表面磨损形貌和耐磨性能的影响。结果表明:涂层中主要含有WC、CuSn相和富Fe相,未添加La2O3的涂层组织中存在较多缺陷,表面磨损严重。随着La2O3的加入,涂层组织和耐磨性能得到不同程度的改善。La2O3质量分数为1.0%时,涂层孔隙率最低仅为0.84%,硬度为54.8HRC,相对耐磨系数9.76。表面磨损形貌平整且无剥落坑,划痕较浅,涂层与母材结合紧密,表现出最佳的耐磨性能。     

Cu含量对Al2O3·SiO2sf/Al-Cu复合材料耐磨性能的影响

通过挤压铸造的方法制备出了不同Cu含量的系列Al2O3·SiO2sf/Al-Cu复合材料.摩擦磨损实验结果表明,Cu的加入降低了复合材料的摩擦系数;且随着Cu含量的增加,Al2O3·SiO2sf/Al-Cu复合材料的耐磨性能先增加后降低.在磨损过程中,Al2O3·SiO2纤维增强相牢固地镶嵌在基体里并形成支架,起到保护基体而提高复合材料耐磨性能的作用.Al2O3·SiO2sf/Al复合材料的磨损机制主要为黏着磨损,Al2O3·SiO2afAl-Cu复合材料的磨损机制为黏着磨损为主并伴有磨粒磨损.     

自润滑纤维织物复合材料摩擦学性能研究

目的研究MoS_2和石墨填充对自润滑纤维织物复合材料摩擦学性能的影响。方法采用玄武三号栓-盘式摩擦磨损实验机,研究了石墨和MoS_2填充PTFE/棉纤纤维织物在不同载荷条件下的摩擦磨损性能,并采用扫描电镜观察了纤维织物复合材料的磨损表面和微观结构。结果在较低载荷下,填充5%MoS_2可以更有效地降低PTFE/棉纤纤维织物复合材料的磨损率;在较高载荷下,填充10%石墨可以更有效地降低PTFE/棉纤纤维织物复合材料的磨损率。载荷为219.52 N时,5%MoS_2填充PTFE/棉纤纤维织物复合材料的磨损率由未填充的1.28×10~(-14) m~3/(N·m)降低到0.61×10~(-14) m~3/(N·m),降低了50%;10%石墨填充PTFE/棉纤纤维织物复合材料的磨损率由1.28×10~(-14) m~3/(N·m)降低到0.91×10~(-14) m~3/(N·m),降低了28%。结论石墨和MoS_2填充在摩擦过程中减轻了磨粒的嵌入和切削作用,阻碍了复合材料的磨损,提高了PTFE/棉纤纤维织物复合材料的耐磨性能。     

基于稀土调控的激光熔覆Ni60强化铝合金的高温摩擦磨损性能研究

目的 提高铝合金的综合使用性能。方法 采用激光熔覆技术对6063铝合金表面分别进行了Ni60、Ni60+4%CeO2、Ni60+5%Y2O3和Ni60+5%La2O3激光熔覆处理,然后进行了硬度和高温摩擦磨损实验,通过分析各试样的摩擦系数、磨痕轮廓、磨损量、物相、成分和磨损后微观形貌,进而分析各试样的耐磨性能和磨损机理,以及稀土对熔覆层耐磨性能和磨损机理的影响。结果 熔覆层的硬度呈梯度分布,加入稀土Ni60熔覆层的硬度明显提升。6063铝合金随着载荷和磨损温度的升高,磨损机制从二体磨粒磨损,到粘着磨损,再到严重的熔融磨损和氧化磨损,由轻微向严重磨损转变。Ni60熔覆层的磨损机制主要为剥层磨损、氧化磨损和轻微的犁削磨损,并随着载荷和磨损温度的升高,剥层磨损的程度越来越严重。添加最佳稀土含量的熔覆层随着载荷和磨损温度的升高,磨损机制逐渐由以犁削磨损为主过渡为以剥层磨损为主,并含有氧化磨损和犁削磨损。与Ni60熔覆层相比,加入最佳稀土含量的熔覆层的高温摩擦磨损性能均有明显提高。结论 对比三种稀土熔覆层,高温摩擦磨损性能由好到差的顺序为Ni60+4%CeO2熔覆层>Ni60+5%Y2O3熔覆层>Ni60+5%La2O3熔覆层。     

Abrasive wear characteristics and mechanisms of Al2O3／PA1010 composite coatings

The abrasive wear characteristics of Al2O3/PA1010 composite coatings on the surface of quenched and low-temperature temper steel 45 were tested on the tumplate abrasive wear testing machine and the same uncoated steel 45 was used as a reference material. Experimental results showed that the abrasive wear resistance of Al2O3/PA 1010 composite coatings has a good linear relationship with the volume fraction of Al2O3 particles in Al2O3/PA1010 composite coatings, and the linear correlative coefficient is 0.979. Under the experimental conditions, the size of Al2O3 particles (40.5-161.0μm) has little influence on the abrasive wear resistance of Al2O3/PA1010 composite coatings. By treating the surface of Al2O3 parti-cles with a suitable bonding agent, the distribution of Al2O3 particles in matrix PA1010 is more homogeneous and the bonding state between Al2O3 particles and matrix PA1010 is better. Therefore, the Al2O3 particles in Al2O3/PA1010 compos-ite coatings make the Al2O3/PA1010 composite coatings have better abrasive wear resistance than PA1010 coatings. The wear resistance of Al2O3/PA1010 composite coatings is about 45% compared with that of steel 45.     

硼酸镁晶须增强6061铝基复合材料的干摩擦磨损行为(英文)

研究搅拌铸造工艺制备的硼酸镁晶须增强6061铝基复合材料在干滑动条件下的摩擦磨损性能。复合材料的体积分数为2%,根据增强体种类,材料分别记为:Al基体、Mg2B2O5w/6061Al、ZnO/Mg2B2O5w/6061Al和CuO/Mg2B2O5w/6061Al;讨论磨损速率和摩擦因数之间的关系。结果表明:在4种材料中,ZnO/Mg2B2O5w/6061Al复合材料的磨损率最低。随着载荷和滑动速度的增大,基体和复合材料的摩擦因数和磨损率降低,摩擦磨损机制由轻微磨损机制转向严重磨损机制。     

La2O3对激光熔覆铁基JG-8合金组织与性能的影响

采用激光熔覆技术在27SiMn钢基体表面成功制备了不同La_2O_3含量的铁基JG-8合金复合涂层,系统地研究了添加La_2O_3对铁基JG-8合金复合涂层组织及性能的影响。利用X射线衍射仪(XRD)和配有能谱仪(EDS)的扫描电子显微镜(SEM)对铁基JG-8合金复合涂层的物相结构和显微组织进行分析测试,通过显微硬度仪和摩擦磨损试验机对铁基JG-8合金复合涂层的硬度以及摩擦学性能进行分析评估。结果表明,La_2O_3的添加可有效细化组织,使晶粒由原本的柱状晶转变为细小的胞状结构。铁基JG-8合金复合涂层的硬度随着La_2O_3含量的增加呈现先增大后减小的趋势,其中0.8%La_2O_3(质量分数)铁基JG-8合金复合涂层的硬度(HV0.3)(5327MPa)最高,与未添加La_2O_3的铁基JG-8涂层相比,0.8%La_2O_3铁基JG-8合金复合涂层的硬度提升了19.4%。在摩擦磨损过程中未添加La_2O_3的铁基JG-8涂层主要磨损机制为粘着磨损和疲劳磨损,0.8%La_2O_3铁基JG-8合金复合涂层的主要磨损机制为磨粒磨损,0.8%La_2O_3铁基JG-8合金复合涂层的体积磨损量最低,为27SiMn钢基体的22.9%。     

Friction and wear properties of ultra-high molecular mass polyethylene reinforced with Al2O3 nano-particle

The ultra-high molecular mass polyethylene (UHMMPE) as an artificial joint acetabular material was filled with nano-powder of Al2O3 of various mass fractions. The effect of Al2O3 mass fraction on the hardness, wetting property and tribological properties of the Al2O3-UHMMPE composites under dry friction sliding against both stainless steel and Ti-6Al-4V alloy was investigated. The morphologies of the worn surfaces of composites were observed with optical microscope. The results show that, wetting property and wear resistance of the composites are improved by filling Al2O3, while the friction coefficient is decreased largely under dry friction as compared with that of the unfilled UHMMPE. This is attributed to the reinforcing function of the nano-powder of Al2O3 in the composites. The wear of UHMMPE is dominated by plowing, plastic deformation and fatigue wear; while the Al2O3-UHMMPE composites are characterized by the mild fatigue wear.     

Wear and transfer characteristics of carbon fiber reinforced polymer composites under water lubrication

The tribological characteristics of carbon fiber reinforced polymer composites under distilled-water-lubricated-sliding and dry-sliding against stainless steel were comparatively investigated. Scanning electron microscopy (SEM) was utilized to examine composite microstructures and modes of failure. The typical chemical states of elements of the transfer film on the stainless steel were examined with X-ray photoelectron spectroscopy (XPS). Wear testing and SEM analysis show that all the composites hold the lowered friction coefficient and show much better wear resistance under water lubricated sliding against stainless steel than those under dry sliding. The wear of composites is characterized by plastic deformation, scuffing, micro cracking, and spalling under both dry-sliding and water lubricated conditions. Plastic deformation, scuffing, micro cracking, and spalling, however, are significantly abated under water-lubricated condition. XPS analysis conforms that none of the materials produces transfer films on the stainless steel counterface with the type familiar from dry sliding, and the transfer of composites onto the counterpart ring surface is significantly hindered while the oxidation of the stainless steel is speeded under water lubrication. The composites hinder transfer onto the steel surface and the boundary lubricating action of water accounts for the much smaller wear rate under water lubrication compared with that under dry sliding. The easier transfer of the composite onto the counterpart steel surface accounts for the larger wear rate of the polymer composite under dry sliding.     

(WC+SiCw)/Cu-Al2O3复合材料载流摩擦磨损行为

目的 研究相同载流条件下纳米Al2O3颗粒、微米WC颗粒和SiC晶须对(WC+SiCw)/Cu-Al2O3复合材料表面摩擦磨损性能的影响.方法 采用粉末冶金法和内氧化法相结合的方式,制备了(WC+SiCw)/Cu-Al2O3复合材料,并利用HST-100高速载流摩擦试验机进行载流摩擦磨损性能测试.采用透射电镜和扫描电镜...     

Friction and wear properties of N+ ion implanted nylon 1010

The PA1010 was implanted with 450 keV N ions to three doses of 5× 1014 cm-2 , 2.5× 1015 cm-2 and 1.25 × 1016 cm-2. The friction and wear behaviors of the ion implanted PA1010 disks rubbing with two ceramic (ZrO2 and Si3N4) balls were studied using a pin-on-disk tribometer under dry friction. The results shows that the wear resistance of PA1010 is increased with the increasing implantation doses. The adhesion, plastic deformation and plow groove are wearing mechanisms for un-implanted PA1010, while abrasive wear for implanted PA1010.     

尼龙1010/n-SiO2复合涂层摩擦学性能研究

探讨了纳米SiO2（n-SiO2）对火焰喷涂尼龙（Nylon）1010涂层干摩擦磨损性能的影响，采用MRH-3型环-块摩擦磨损试验机对不同n-SiO2含量的尼龙1010涂层的干摩擦磨损性能进行了测试；并利用扫描电子显微镜（SEM）对复合涂层的磨损表面进行观察。结果表明：n-SiO2的加入能明显提高尼龙涂层的耐磨性，降低摩擦因数，疲劳磨损、粘附磨损及犁切现象明显减轻，当n-SiO2含量为1．5％时复合涂层综合性能较好。     

Relationship Between the Integrity of Lubricating Film and the Tribological Behavior on TiAl-Ag Self-Lubricating Composites

To explore the relationship between the integrity of the lubricating film and the tribological behavior of a metal matrix self-lubricating composite, the friction and wear experiments of TiAl-Ag self-lubricating composites were carried out with a ball-on-disk configuration. Besides, an approximate model was developed for analyzing the relationship based on Blau’s theory. The research results suggest that the friction and wear behavior of the TiAl-Ag self-lubricating composites changes in accordance with the formation conditions of the Ag-rich lubricating film. Specifically, the friction coefficients and wear rates of the TiAl-Ag self-lubricating composites decreased from high levels at full composite–counterface ball contact to low levels at full-film lubrication. Hence, the integrity of the lubricating film is a possible criterion for the self-lubricating property of the self-lubricating composites.     

碳纤维含量对Al2O3+C/ZL109混杂复合材料摩擦磨损性能的影响

利用挤压铸造法制备了A1203 C／ZLl09短纤维混杂金属基复合材料，并探讨了A1203纤维体积分数为12％时，C纤维含量对该混杂复合材料摩擦磨损性能的影响。结果表明：随着C纤维体积分数的增加，复合材料的摩擦因数和磨损率逐渐降低。12％A1203和4％C短纤维的协同作用使复合材料从轻微磨损到急剧磨损的临界转变载荷比基体合金提高了1倍。当载荷低于临界载荷时，复合材料的主要磨损机制为犁沟磨损和层离，C纤维的加入有利于磨损表面裂纹尺寸的减小。但随着载荷的逐渐增加并发生严重磨损时，基体和复合材料的磨损机制均为严重的粘着磨损甚至局部熔化磨损。