纳米SiC含量对Ti3SiC2/Al复合材料摩擦磨损特性的影响

采用SPS方法制备出SiC和Ti3SiC2双相增强Al基复合材料,并在MM-200型摩擦磨损实验机上进行干摩擦试验。研究了不同含量SiC对Ti3SiC2/Al复合材料组织及耐磨性的影响,结果表明,颗粒体积分数及磨损载荷对复合材料摩擦磨损特性有显著影响。复合材料具有良好的摩擦磨损性能,烧结温度为550℃,SiC的体积分数从0.5%上升到2%时,复合材料的摩擦系数从0.34降到0.285,降低16.2%。烧结温度为400℃,SiC的体积分数从0.5%上升到2%时,复合材料的磨损量从0.0079降到0.0039,降低50.63%。     

水润滑条件对UHMWPE复合材料的摩擦行为影响研究

为研究不同水润滑条件对超高分子量聚乙烯/橡胶复合材料摩擦过程的影响,通过高温混炼和热压成型制备不同橡胶填充不同UHMWPE复合材料.利用Mrh-3型环块摩擦实验机,通过控制变量法定量研究不同组分复合材料的摩擦磨损性能,从而优选出最终UHMWPE复合材料.针对选定材料研究3种水润滑工况对摩擦过程的影响,同时利用SEM分析磨损表面,从微观层面探究摩擦机理.实验结果表明,水润滑条件对UHMWPE复合材料摩擦磨损性能指标影响显著,对应的磨损机理迥异,润滑条件的改善可使磨合期变短,稳定磨损期变长.从微观和定量方面综合评估了舰艇水润滑轴承材料在不同水润滑条件下的磨损状况,可为工况规划与实际应用提供理论指导.     

三维编织碳/环氧复合材料的摩擦学特性

为研究三维编织复合材料的摩擦学行为，采用RTM工艺制备了三维编织碳纤维增强环氧树脂复合材料，讨论了纤维体积比、纤维表面处理和润滑条件等因素对复合材料摩擦磨损性能的影响。结果表明，随着纤维含量的增加，复合材料的摩擦系数先降后升，在35％时有最小值；磨损率则一直下降。纤维表面处理使复合材料的磨损率降低，耐磨性提高，水润滑条件下复合材料的摩擦磨损性能远优于干摩擦条件下的性能。干摩擦条件下复合材料的磨损机制主要为黏着磨损，水润滑条件下则以磨粒磨损为主。     

Cu-Fe基摩擦片摩擦磨损性能的研究

为探究带式运输机铜基摩擦片的摩擦学行为,采用粉末冶金工艺制备Cu-Fe基摩擦材料。在干式制动条件下用环-块摩擦磨损试验机研究摩擦片的摩擦学行为。探索铁元素对铜基复合材料摩擦片摩擦行为和磨损机理的作用。结果表明,与铜-石墨复合材料相比添加了铁元素的铜-石墨复合材料在高载荷下表现出更好的摩擦学性能,其在摩擦表面上形成的富含石墨的机械混合层(MML)更加稳定。     

SiC颗粒填充单体浇铸尼龙的摩擦学性能

为了研究 Si C颗粒作为填料对单体浇铸尼龙 (MC尼龙 )的摩擦磨损性能的影响 ,选用两种材料在 MM- 2 0 0摩擦磨损试验机上进行了试验研究 ,并借助于扫描电镜观察了磨损形貌 ,探讨了磨损机理。研究结果表明 ,在干摩擦条件下 ,Si C颗粒填充 MC尼龙的摩擦学性能与载荷和滑动速度的乘积 (Pv)值的大小有关 ,复合材料的摩擦因数比纯尼龙的大 ,当 Pv值较低时 ,复合材料的耐磨性能比纯尼龙好 ,其磨损机理主要是磨粒磨损和粘着磨损 ;当 Pv值较高时 ,复合材料的耐磨性能不如纯尼龙 ,其磨损机理主要是疲劳剥落 ,并有磨粒磨损和粘着磨损。在水润滑条件下 ,Si C颗粒填充 MC尼龙表现出较好的耐磨性能 ,其摩擦学性能受 Pv值的影响小 ,磨损机理主要是磨粒磨损     

干摩擦条件下金刚石复合膜摩擦学性能

在干摩擦条件下利用 SRV磨损试验机比较了在硬质合金基体上金刚石薄膜、石墨 /金刚石复合膜以及硬质合金 3种试样的摩擦学性能。利用扫描电子显微镜观察了试样和磨痕的表面形貌。利用表面形貌仪测试了磨损体积。研究了振动频率对试样的摩擦学性能影响。结果表明 ,在干摩擦条件下 ,金刚石薄膜与石墨 /金刚石复合膜的摩擦学性能差别不大 ,二者的磨损机理均为微断裂磨损。在干摩擦条件下 ,高频时金刚石薄膜的耐磨性是硬质合金耐磨性的 8～ 10倍 ,其原因是硬质合金的磨损机理存在着从粘着磨损到微断裂磨损的转变     

SiC_p/Al_2O_(3f) 混杂增强 2024Al 复合材料摩擦磨损性能的研究

研究了２０２４铝合金、ＳｉＣｐ／Ａｌ２Ｏ３ｆ混杂增强２０２４Ａｌ复合材料与汽车刹车材料对磨时的摩擦磨损性能．借助扫描电镜对磨损形貌的观察,分析了材料的磨损机理．在本研究的试验条件下,２０２４铝合金的磨损极为严重,ＳｉＣｐ／Ａｌ２Ｏ３ｆ混杂增强２０２４Ａｌ复合材料的耐磨性能良好．由于ＳｉＣｐ／Ａｌ２Ｏ３ｆ混杂增强２０２４Ａｌ复合材料的密度较低,因而该材料在汽车工业中有广泛的应用前景．     

Friction and Wear Behaviors of C/C-Si C Composites under Water Lubricated Conditions

C/C-SiC composites have the potentiality to be applied in shield pumps of nuclear reactors as the bearing material because of their low density, good mechanical properties and excellent tribological properties. The C/C-SiC composites are fabricated via reactive melt infiltration(RMI) using silicon liquid infiltrated in C/C matrix composites. Friction and wear behaviors of C/C-SiC composites under water lubricated conditions are investigated using the block-on-ring test at room temperature, and compared with those of the resin graphite which is used as the bearing material in shield pumps at present. In addition, friction and wear mechanisms of C/C-SiC composites under water lubricated conditions have been discussed. Results show that tensile strengths of C/C-SiC composites are 150-210 MPa, and compressive strengths are 403-536 MPa. Friction and wear behaviors of C/C-SiC composites are closely related to the load and the speed. The time to reach a stable friction status decreases with the increase of the speed. Though the friction coefficient of C/C-SiC composites under water lubricated conditions is slightly higher than that of graphite, the wear rate of C/C-SiC composites is much lower, which suggests that the C/C-SiC composites can sustain a longer life during operation.     

TiC/ZA43复合材料耐磨性能的试验研究

采用原位接触反应法制备了ＴｉＣ／ＺＡ４３复合材料,并对其在干摩擦和预先滴油润滑条件下的摩擦摩损性能进行了试验研究,同时还用扫描电子显微镜对试样磨损表面形貌进行了观察,进而对材料的磨损机理作为分析与讨论,结果表明,随着ＴｉＣ质量分数的增大,ＴｉＣ／ＺＡ４３复合材料的耐磨性能提高,ＺＡ４３合金的磨损机理是以严重的犁削和磨损为主,而ＴｉＣ／ＺＡ４３复各材料的磨损机理则以轻微的犁削和氧化磨损为主。     

C/SiC复合材料摩擦性能及储油性能分析

复合材料因性能独特而备受关注,但其自身结构复杂且受到诸多因素的影响,因而对其摩擦学性能的研究仍有待进一步加强。为了对比不同摩擦配副对C/SiC复合材料摩擦性能及储油性能的影响,以C/SiC复合材料为研究对象,运用销盘摩擦学试验方法,研究了C/SiC复合材料与45#钢以及C/SiC复合材料与ZrO₂材料摩擦配副的摩擦学性能,采用三维形貌仪等仪器对C/SiC复合材料摩擦后的表面进行表征分析,研究其摩擦后的表面质量及其储油性能。结果表明,C/SiC复合材料与45#钢磨损剧烈,摩擦后表面储油性能严重下降;其与ZrO₂对磨则摩擦系数较低,磨损量较小,摩擦后的表面仍保持了较好的承载性能及储油性能,是一种良好的摩擦配副。研究结果为拓展C/SiC复合材料的应用及揭示其摩擦学特性提供了有力支撑。     

高石墨铜基复合自润滑材料的组织结构与性能

以Cu-Ni粉末为基体,添加定量的W,SiC,Y2O3和MoS2相,以粉末冶金方法制备石墨质量分数分别为3%,3.5%,4%,4.5%和5%的高石墨含量铜基复合自润滑材料.利用金相显微镜、扫描电镜、X射线衍射仪、共聚焦成像仪和摩擦试验机对样品的组织结构和性能进行分析.结果表明:材料的最佳烧结温度为910℃,烧结时间为4 h;材料的组织由铜的α固溶体,Cu0.8Ni0.19,WMoS2,SiC和石墨等组成.力学性能随着石墨含量的增加而降低,但自润滑效果比较好.在保证材料基体具有高力学性能的基础上,提高材料中固体润滑相的含量,是制备高耐磨自润滑材料的关键因素.     

Influence of applied load on wear behavior of C/C-Cu composites under electric current

Using carbon fiber needled fabrics with Cu-mesh and graphite powder as the preform, Cu mesh modified carbon/carbon(C/C-Cu) composites were prepared by chemical vapor deposition (CVD) with C3H6 and impregnation-carbonization (I/C) with furan resin. C/C composites, as a comparison, were also prepared. Their microstructures and wear morphologies were observed by optical microscopy (OM) and scanning electron microscope (SEM), respectively. Wear behavior of C/C and C/C-Cu composites under different applied loads were investigated on a pin-on-disc wear tester. The results show that Cu meshes are well dispersed and pyrolytic carbon is in rough laminar structure. Both C/C and C/C-Cu composites had good wear properties. The current-carrying capacity of C/C-Cu composites increases and the arc discharge is hindered as the applied load increases from 40 N to 80 N. Both C/C and C/C-Cu composites had good wear properties. The mass wear rate of C/C-Cu composites under 80 N was only 4.2% of that under 60 N. In addition, C/C-Cu composites represent different wear behaviors because wear mechanisms of arc erosion, abrasive wear, adhesive wear, and oxidative wear are changing under different applied loads.     

SiC颗粒增强铁基粉末冶金复合材料的研究

采用粉末冶金方法制备了ＳｉＣ颗粒增强铁基复合材料,考察了ＳｉＣ颗粒含量与铁基粉末冶金复合材料的显微组织、相对密度、力学性能及磨损性能之间的关系,并探讨了其摩擦磨损机理。结果表明,合适的ＳｉＣ含量能在基本不降低材料强度的基础上大幅度提高耐磨性能。     

颗粒对液-固二相润滑摩擦和温度特性影响的试验研究

文章研究了润滑油中含有固体颗粒时对摩擦副摩擦和温度特性的影响,试验在HDM20端面摩擦磨损试验机上进行,试验采用3种微米级的固体颗粒添加剂,即Al2O3、MoS2和石墨粉, 在线测量了温度的变化过程和摩擦系数;结果表明,较软的MoS2和石墨粉降低了温度,减小摩擦系数,较硬的Al2O3颗粒升高了温度,容易使摩擦副擦伤;颗粒加入量对温度和摩擦特性有明显影响,在该文研究工况下,1.5 μm的石墨粉质量分数控制在5%以内对润滑有一定改善作用,在1%时效果最好.选用1.5 μm、2.3 μm、4.0 μm、10 μm、15 μm、30 μm粒径的石墨颗粒进行了试验研究,发现从1.5 ～4.0 μm时,随着颗粒粒径的增大温度变高,摩擦系数变大,从4 ～30 μm时,随着颗粒粒径的增大温度变低,摩擦系数变小.     

Influence of sulfides on the tribological properties of composites produced by pulse electric current sintering

Self-lubricating Al₂O₃-15wt% ZrO₂ composites with sulfides, such as molybdenum disulfide (MoS₂) and tungsten disulfide (WS₂) serving as solid lubricants, were fabricated by using the pulse electric current sintering (PECS) technique. The coefficient of friction (COF) of the Al₂O₃-15wt% ZrO₂ composite without/with sulfides was in the range of 0.37–0.48 and 0.27–0.49, respectively. As the amount of sulfides increased, the COF and the wear rate decreased. The reduction in COF and wear rate of the sulfide-containing composite is caused by a reduction in shear stresses between the specimen and the tribological medium due to the formation of a lubricating film resulting from the lamellar structure of sulfides located on the worn surface.     

MOSi2-淬火45#钢在油润滑下的摩擦学特性

利用M-200型磨损试验机考察了MoSi2-淬火45针仪分析讨论其磨损机理.结果表明:润滑油明显改善了MoSi2材料的摩擦学性能;MoSi2与淬火45#钢对摩在120～150 N载荷范围内表现出较好的摩擦磨损综合性能;其磨损机制主要表现为疲劳磨损、磨粒磨损和轻微粘着磨损.图4,参10.     

Effect of Al<Subscript>2</Subscript>O<Subscript>3sf</Subscript> addition on the friction and wear properties of (SiC<Subscript>p</Subscript>+Al<Subscript>2</Subscript>O<Subscript>3sf</Subscript>)/Al2024 composites fabricated by pressure infiltration

Aluminum (Al) 2024 matrix composites reinforced with alumina short fibers (Al₂O_3sf) and silicon carbide particles (SiC_p) as wear-resistant materials were prepared by pressure infiltration in this study. Further, the effect of Al₂O_3sf on the friction and wear properties of the as-synthesized composites was systematically investigated, and the relationship between volume fraction and wear mechanism was discussed. The results showed that the addition of Al₂O_3sf, characterized by the ratio of Al₂O_3sf to SiC_p, significantly affected the properties of the composites and resulted in changes in wear mechanisms. When the volume ratio of Al₂O_3sf to SiC_p was increased from 0 to 1, the rate of wear mass loss (K_m) and coefficients of friction (COFs) of the composites decreased, and the wear mechanisms were abrasive wear and furrow wear. When the volume ratio was increased from 1 to 3, the COF decreased continuously; however, the K_m increased rapidly and the wear mechanism became adhesive wear.     

不同载荷下C/C复合材料往返式滑动摩擦行为

以GCr钢球为对偶,在UMT-3微摩擦试验机上测试2种具有不同基体炭结构的C/C复合材料长时间往返式滑动摩擦磨损行为。研究结果表明:在相同载荷下,具有粗糙层热解炭基体的材料A的平均摩擦因数高于具有光滑层/树脂炭基体的材料B平均摩擦因数;在60N时,材料A的平均摩擦因数出现最大值,为0.193;而材料B的平均摩擦因数出现最低值,为0.120;随着载荷的增加,2种材料的平均摩擦因数均出现较大的波动,其中:材料A的平均摩擦因数变化趋势为先升后降,材料B的平均摩擦因数先降后升,但二者的差值随载荷增加先增后减;随着时间的延长,所有试样的摩擦因数均逐渐趋于稳定;材料A的摩擦表面膜较完整、致密,但存在大块摩擦膜剥落或交替堆叠;材料B的摩擦表面较粗糙,形成纤维与基体炭分开堆积成膜形貌。     

气缸套表面微织构填充的摩擦学性能实验研究

为了探究气缸套表面微级织结构(简称微织构)填充的摩擦学性能,在其试样表面进行微织构并分别填充蛇纹石和二硫化钼微纳米粉。在高载和低载条件下,通过往复式摩擦磨损试验机进行实验,利用SEM、EDX观察试样表面形貌和元素成分,探索表面微织构填充气缸套试样的摩擦行为和磨损机理。结果表明:微织构填充气缸套试样的摩擦学性能在高载荷和低载荷条件下都好于单微织构及机械珩磨的气缸套试样,其减摩耐磨性能是微织构和填充物质协同作用的结果;并且较大尺寸的微坑内径对摩擦系数的影响效果更明显;二硫化钼对摩擦系数的改善效果好于蛇纹石。     

Effect of Al_2O_(3sf) addition on the friction and wear properties of(SiC_p+Al_2O_(3sf))/Al2024 composites fabricated by pressure infiltration

Aluminum(Al) 2024 matrix composites reinforced with alumina short fibers(Al_2O_(3sf)) and silicon carbide particles(SiC_p) as wear-resistant materials were prepared by pressure infiltration in this study. Further, the effect of Al_2O_(3sf) on the friction and wear properties of the as-synthesized composites was systematically investigated, and the relationship between volume fraction and wear mechanism was discussed. The results showed that the addition of Al_2O_(3sf), characterized by the ratio of Al_2O_(3sf) to SiC_p, significantly affected the properties of the composites and resulted in changes in wear mechanisms. When the volume ratio of Al_2O_(3sf) to SiC_p was increased from 0 to 1, the rate of wear mass loss(K_m) and coefficients of friction(COFs) of the composites decreased, and the wear mechanisms were abrasive wear and furrow wear. When the volume ratio was increased from 1 to 3, the COF decreased continuously; however, the K_m increased rapidly and the wear mechanism became adhesive wear.