氧化铝陶瓷在海水润滑下的摩擦学行为研究

采用UMT-3摩擦实验机研究氧化铝陶瓷在海水润滑条件下的摩擦学行为,并与其在干摩擦和纯水润滑条件下的摩擦学行为进行比较。利用扫描电子显微镜和X-射线光电子能谱观察并分析氧化铝陶瓷磨损表面形貌以及磨损表面主要元素的化学状态,探讨氧化铝陶瓷在海水中的摩擦化学特性。结果表明,氧化铝陶瓷在干摩擦时具有最大的摩擦因数和最小的磨损率,在海水润滑条件下具有最小的摩擦因数和最大的磨损率,这是氧化铝在海水中发生了摩擦化学反应的结果。氧化铝陶瓷在干摩擦时的磨损主要表现为轻微的脆性剥落,在纯水润滑条件下表现为严重的脆性剥落,而在海水润滑条件下表现为摩擦化学磨损以及极轻微的脆性剥落。     

水润滑条件下等离子陶瓷涂层的磨损机理研究

针对纯水液压柱塞泵工况，研究了滴水润滑条件下五种等离子陶瓷涂层和整体烧结氧化铝配对的摩擦磨损情况，考察了摩擦系数和试环的磨损量随时间的变化规律，利用SEM、X射线能量色散谱仪等设备观察和分析了磨损表面的形貌和化学元素组成。     

不同环境介质下氧化铝陶瓷与耐蚀金属摩擦磨损行为

为优选海水淡化高压泵关键零部件耐磨性能材料,以Al_2O_3陶瓷与TC4钛合金、316不锈钢、2205双相不锈钢组成的配对摩擦副作为研究对象,利用立式万能摩擦磨损试验机开展干摩擦、纯水及海水3种环境介质下配对材料的摩擦磨损试验,定量得到各摩擦副摩擦因数、磨损量,并对摩擦试样的表面形貌进行分析;采用正交试验法分析载荷、转速、环境介质对摩擦因数和磨损量的影响规律。结果表明:在相同的条件下,TC4钛合金与陶瓷配副摩擦因数较小,2205双相不锈钢与陶瓷配副磨损量较小;环境介质对摩擦因数影响较大,载荷对磨损量的影响较大;海水环境下2205双相不锈钢和316不锈钢磨痕较浅,磨损机制为疲劳磨损、磨粒磨损和腐蚀磨损的交互作用。     

3Y-TZP陶瓷在水润滑条件下磨损特性的研究

采用销-盘式摩擦磨损试验机在水润滑条件下对3Y—TZP／（Mg,Y）-PSZ陶瓷摩擦副的磨损性能进行了试验研究。结果表明,3Y—TZP陶瓷的磨损率随着载荷和滑行速度的增加而增大。在低载低速下3Y—TZP陶瓷发生的是微量磨损,其磨损过程相当于抛光;随着载荷与滑动速度的增加,发生的是轻微磨损,相应的磨损机制为塑性变形和微犁削。在高载荷条件下发生了严重磨损,磨损的主要机制是表面断裂。     

陶瓷刀具切削加工时的磨损与润滑

结合国内外的研究现状 ,对陶瓷刀具切削加工时的磨损、润滑以及陶瓷刀具与加工对象的最佳匹配问题进行了综合评述     

车削氧化铝陶瓷刀具磨损有限元仿真研究

基于修正的Johnson-Cook本构模型,在DEFORM中进行氧化铝陶瓷的切削仿真,分析了切削速度、切削深度及切削路程对刀具磨损量的影响。研究结果表明,刀具的最大磨损深度随切削速度的增大而减小、随切削深度的增加而增加。磨损深度随切削路程变化的仿真结果表明,切削过程中的刀具磨损可分为3个阶段,即初期磨损阶段,正常磨损阶段及急剧磨损阶段。     

氧化铝基陶瓷刀切削可靠性研究：基于磨损的刀具可靠性

以氧化铝基陶瓷刀具磨损寿命的随机特性分析为基础，提出并验证了基于磨损的陶瓷刀具可靠性的理论模型。结果表明：其磨损寿命很好地服从对数正态分布；可以用刀具磨损寿命变异系数来评价基于磨损的氧化名基陶瓷刀具的切削可靠性。     

氧化铝基陶瓷刀具切削可靠性研究——基于磨损的刀具可靠性

以氧化铝基陶瓷刀具磨损寿命的随机特性分析为基础,提出并验证了基于磨损的陶瓷刀具可靠性的理论模型。结果表明：其磨损寿命很好地服从对数正态分布;可以用刀具磨损寿命变异系数来评价基于磨损的氧化铝基陶瓷刀具的切削可靠性。     

钢／钢,工程陶瓷／钢系统的摩擦,磨损和润滑的研究

采用Ｔｉｍｋｅｎ摩擦试验机在空气、水及润滑剂中，对钢、热等静压烧结氮化硅（ＨＩＰ－Ｓｅ３Ｎ４）及掺硼碳化硅（ＳｉＣ－Ｂ）陶瓷材料的摩擦机理进行了研究。试验中，对各种参数，包括速度、滑动距离和各种润滑剂进行了比较。     

全油膜润滑条件下磨粒磨损特性的实验研究

本文应用最新研制的ＭＭＵ－５型流体润滑摩擦磨损试验机，对全油膜润滑条件下三体磨粒磨损的特性进行了一些实验研究。     

Lubrication of Si3N4 and Al2O3 in water with and without addition of silane coupling agents in the range of 0.05–0.10 mol/l

To improve water lubrication of ceramics at a lower sliding velocity, the effect of the addition of silane coupling agents was investigated. Si₃N₄ and Al₂O₃ were slid against themselves in water with and without the addition of silane coupling agents in amounts ranging from 0.05 to 0.10 mol/l. Silane coupling agents containing one or more amino groups were effective in reducing the friction of Si₃N₄ and Al₂O₃ in water. Si₃N₄ also showed significant wear reduction but not Al₂O₃. However, the addition of a silane coupling agent containing an epoxy group increased both friction and wear of Si₃N₄. Improved lubricative characteristics of Si₃N₄ in water and in silane coupling agent solutions were obtained when Si₃N₄ contained smaller amounts of sintering additives. The adsorption behaviour of a silane coupling agent on ceramics was examined using both Fourier transform infrared spectroscopy and thin layer chromatography to clarify the interaction between the silane coupling agent and the ceramics. The role of polysiloxane film formation on ceramics is discussed to demonstrate the lubrication properties of ceramics.     

纳米ZrO2/SiC-WSi2/MOSi2复相陶瓷的显微结构与耐磨性

将纳米ZrO2和SiC颗粒与微米WSi2／MoSi2颗粒进行球磨分散、混合，通过热压烧结制备ZrO2／SiC-WSi2／MoSi2复相陶瓷，研究了它的显微结构与耐磨性并与MoSi2材料进行了对比。结果表明：SiC、ZrO2纳米颗粒的复合化以及钨的合金化能使复相陶瓷晶粒细化，复相陶瓷的硬度较MoSiz陶瓷明显提高，耐磨性优于MoSiz陶瓷，磨损机制主要为粘着磨损兼有疲劳微断裂。     

Wear behaviour of Al/(Al2O3p+SiCp) hybrid composites

In this study, dry sliding metal–metal and metal–abrasive wear behaviours of the aluminium matrix hybrid composites produced by pressure infiltration technique were investigated. These composites were reinforced with 37 vol% Al₂O₃ and 25 vol% SiC particles and contained up to 8 wt% Mg in their matrixes. While matrix hardness and compression strength increased, amount of porosity and impact toughness decreased with increasing Mg content of the matrix. Metal–metal and metal–abrasive wear tests revealed that wear resistance of the composites increased with increasing Mg addition. On the other hand, abrasive resistance decreased with increasing test temperature, especially above 200 °C.     

Dry sliding wear mechanism for P/M austenitic stainless steels and their composites containing Al2O3 and Y2O3 particles

Austenitic stainless steels are used in applications demanding general corrosion resistance at room or moderate operating temperatures. However, their use is often limited by the relative softness of these materials and their suceptibility to wear and galling. The present investigation deals with the dry sliding wear behaviour of two P/M austenitic stainless steels (AISI 304L and 316L) and their composites containing two different ceramic particles (Al₂O₃ and Y₂O₃) and two different sintering activators (BN and B₂Cr). Unlubricated pin-on-disc wear tests were carried out. Wear mechanisms were analysed by means of scanning electron microscopy and X-ray diffraction. A plastic deformation and particle detachment wear mechanism was revealed. Plasticity during sliding induced an austenite to martensite transformation. The presence of ceramic particles (Al₂O₃ and Y₂O₃) and sintering activators (B₂Cr, BN) improved significantly the wear resistance (especially the combination Al₂O₃ and B₂Cr). Ceramic particles limited plastic deformation while sintering activators decreased final porosity.     

Wear properties of two-phase Al2O3/ZrO2 (Y2O3) ceramics at temperatures from 296 to 1073 K

Reciprocating sliding friction experiments were conducted with various two-phase, directionally solidified Al₂O₃/ZrO₂ (Y₂O₃) pins sliding on B₄C flats in air at temperatures of 296, 873, and 1073 K under dry sliding conditions. Results indicate that all the Al₂O₃/ZrO₂ (Y₂O₃) ceramics, from highly Al₂O₃-rich to ZrO₂-rich, exceed the main wear criterion requirement of 10⁻⁶ mm³ N⁻¹ m⁻¹ or lower for effective wear-resistant applications. Particularly, the eutectics and Al₂O₃-rich ceramics showed superior wear properties. The composition and microstructure of Al₂O₃/ZrO₂ (Y₂O₃) ceramics played a dominant role in controlling the wear and friction properties. The controlling mechanism of the ceramic wear, friction, and hardness was an intrinsic effect involving the resistance to shear fracture of heterophase bonding and cohesive bonding and the interlocking microstructures at different scales in the ceramics.     

润滑条件对Al2O3基陶瓷材料摩擦磨损性能的影响

本文对Al2O3基陶瓷材料/45#钢摩擦副的摩擦系数与45#钢/45#钢的摩擦系数作了对比滑动摩擦试验研究,观测分析了Al2O3基陶材料磨痕形貌,并就干摩擦,油润滑状态下Al2O3基陶瓷材料的磨损机理进行了分析。结果表明,分别在干摩擦和20#机油润滑下,Al2O3基陶瓷材料/45#钢的摩擦系数均比45#钢自配副时的低,在干摩擦条件下,Al2O3基陶瓷材料的磨损机理是脆性微剥落和磨粒磨损,油润滑条件下,该材料的磨损机理是脆性脱落和耕犁,但磨损量小于干摩擦条件下的磨损量,说明油润滑对Al2O3基陶瓷材料有明显的减磨作用。     

HIP-Si3N4陶瓷/45#钢副干摩擦和水润滑下摩擦学性能

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。     

Influence of Al2O3 reinforcement on the abrasive wear characteristic of Al2O3/PA1010 composite coatings

In the present study, the abrasive wear characteristics of Al₂O₃/PA1010 composite coatings were tested on the turnplate abrasive wear testing machine. Steel 45 (quenched and low-temperature tempered) was used as a reference material. The experimental results showed that when the Al₂O₃ particles have been treated with a silane coupling agent (γ-aminopropyl-triethoxysilane), the abrasive wear resistance of Al₂O₃/PA1010 composite coatings has a good linear relationship with the volume fraction of Al₂O₃ particles in Al₂O₃/PA1010 composite coatings and the linear correlation coefficient is 0.979. Under the experimental conditions, the size of Al₂O₃ particles (40.5-161.0 μm) has little influence on the abrasive wear resistance of Al₂O₃/PA1010 composite coatings. By treating the surface of Al₂O₃ particles with the silane coupling agent, the distribution of Al₂O₃ particles in PA1010 matrix is more homogeneous and the bonding state between Al₂O₃ particles and PA1010 matrix is better. Therefore, the Al₂O₃ particles make the Al₂O₃/PA1010 composite coatings have better abrasive wear resistance than PA1010 coating. The wear resistance of Al₂O₃/PA1010 composite coatings is about 45% compared with that of steel 45.