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英文中文

Halogen-free ionic liquid as metalworking fluid: Impact on tool wear and surface roughness in machining of Ti6Al4V alloys

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-21 DOI: 10.1016/j.wear.2025.206088

Arun Kumar Bambam , Marella Pavan Kalyan , Abinash Pradhan , Kishor Kumar Gajrani

Titanium alloys are known for their poor thermal conductivity. During dry machining of titanium alloy, significant heat is generated, which has detrimental effect on the quality of machined components and longevity of cutting tools. Therefore, metalworking fluids (MWFs) are employed during machining. Vegetable oils are currently recognised as a viable environmentally friendly alternative to petroleum based MWFs owing to their biodegradability, renewability, low toxicity, and efficient lubricating qualities. However, they are also known for poor oxidation stability and inadequate performance at low temperatures. Halogen-free ionic liquids (HF-IL) are evolves as potential additive to MWFs due to its distinct properties such as high thermal stability and oxidation stability. This work compares the effect of varying concentration of phosphonium based HF-IL in canola oil on its thermos-physical properties such as wettability and thermal conductivity. It was found that the addition of HF-IL in canola oil improves the MWFs spreadability by 40

-

45 % by compared to pure canola oil. Further, machining experiments were conducted under three different environments; dry, canola oil and phosphonium based HF-IL blended with canola oil at varying feeds. Machining responses such as cutting temperature, tool flank and rake wear, machined surface roughness and chip morphology were analysed. The findings demonstrated that the use of HF-IL as additives led to drop in cutting temperature by 68

-

93 % and reduction in surface roughness by 24

-

61 % at different feeds compared to dry machining. Furthermore, scanning electron microscopy and energy dispersive spectroscopy examinations elucidated the wear mechanism on tools under different machining environments. HF-IL environment showed the lowest tool flank and rake wear. These data corroborate the effectiveness of HF-IL as MWFs additive to improve tool life and surface finish.

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引用次数: 0

Critical parameters on sliding wear behavior in abradable sealing coatings

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-21 DOI: 10.1016/j.wear.2025.206072

Cong Li , Zhili Tang , Yadong Chai , Shouyin Wei , Fei Du , Li Yang , Yichun Zhou

The abradability of ceramic-based abradable sealing coatings (ASCs) is exhibited as a sliding wear. We constructed a formula for the dimensionless function of wear rate based on the

π

theorem. The interaction coefficient

μ

, the actual intrusion depth

h_{r}

, and the porosity

p_{A S C}

are the main variables influencing wear rate. The abradable process of the sealing coating was investigated by numerical finite element simulations and wear experiments. It was observed that the intrusion depth and wear rate show a trend of increasing and then decreasing with increasing porosity, while a similar trend is shown with wear rate. Both strain energy (

W_{n}

) and friction work (

W_{f}

) affect the wear rate. The wear rate of low-porosity coatings largely depends on strain energy, while that of high-porosity coatings is mainly influenced by friction work. This study has extracted key parameters that affect the high-temperature wear of sealing coatings, providing theoretical and experimental evidence for the preparation and performance assessment of coatings.

{"title":"Critical parameters on sliding wear behavior in abradable sealing coatings","authors":"Cong Li , Zhili Tang , Yadong Chai , Shouyin Wei , Fei Du , Li Yang , Yichun Zhou","doi":"10.1016/j.wear.2025.206072","DOIUrl":"10.1016/j.wear.2025.206072","url":null,"abstract":"<div><div>The abradability of ceramic-based abradable sealing coatings (ASCs) is exhibited as a sliding wear. We constructed a formula for the dimensionless function of wear rate based on the <span><math><mrow><mi>π</mi></mrow></math></span> theorem. The interaction coefficient <span><math><mrow><mi>μ</mi></mrow></math></span>, the actual intrusion depth <span><math><mrow><msub><mi>h</mi><mi>r</mi></msub></mrow></math></span>, and the porosity <span><math><mrow><msub><mi>p</mi><mrow><mi>A</mi><mi>S</mi><mi>C</mi></mrow></msub></mrow></math></span> are the main variables influencing wear rate. The abradable process of the sealing coating was investigated by numerical finite element simulations and wear experiments. It was observed that the intrusion depth and wear rate show a trend of increasing and then decreasing with increasing porosity, while a similar trend is shown with wear rate. Both strain energy (<span><math><mrow><msub><mi>W</mi><mi>n</mi></msub></mrow></math></span>) and friction work (<span><math><mrow><msub><mi>W</mi><mi>f</mi></msub></mrow></math></span>) affect the wear rate. The wear rate of low-porosity coatings largely depends on strain energy, while that of high-porosity coatings is mainly influenced by friction work. This study has extracted key parameters that affect the high-temperature wear of sealing coatings, providing theoretical and experimental evidence for the preparation and performance assessment of coatings.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"574 ","pages":"Article 206072"},"PeriodicalIF":5.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the running-in tribological performance and mechanism of the valve plate with surface texture for axial piston pumps 轴向柱塞泵带表面纹理阀板的磨合摩擦学性能和机理研究

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-18 DOI: 10.1016/j.wear.2025.206085

Shiqi Xia , Chao Huang , Shaogan Ye , Wanxin Jiao , Yimin Xia , Zongming Zhu

The textured valve plate pair's tribological performance directly determines axial piston pumps' efficiency and lifespan. The tribological parameters are significantly impacted by the running-in process. In this paper, ring-on-block testing with three types of textures was conducted to analyze the friction coefficients, running-in time, wear rates, and micrographs under two running-in conditions. In addition, the specific textures were applied during the pump's running-in tests. Results show that the lowest friction coefficient and wear rate of textured specimens are reduced by approximately 29.11 % and 74.88 %, respectively, compared to untextured specimens. The wear mechanism of the textured valve plate pair is primarily abrasive wear. Higher pressure and speed are beneficial in reducing friction and wear during the running-in process.

纹理阀板对的摩擦学性能直接决定了轴向柱塞泵的效率和使用寿命。摩擦学参数受磨合过程的影响很大。本文采用三种纹理对阀板进行了环形测试，分析了两种磨合条件下的摩擦系数、磨合时间、磨损率和显微照片。此外，还在泵的磨合试验中使用了特定的纹理。结果表明，与未纹理试样相比，纹理试样的最低摩擦系数和磨损率分别降低了约 29.11 % 和 74.88 %。纹理阀板对的磨损机理主要是磨料磨损。在磨合过程中，较高的压力和速度有利于减少摩擦和磨损。

引用次数: 0

Modelling of tool wear incorporating various feeds in micro-drilling of carbon fibre-reinforced polymer (CFRP) composites

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-17 DOI: 10.1016/j.wear.2025.206086

Szilárd Seprős, Balázs Markó, Norbert Geier

Micro-drilling of carbon fibre-reinforced polymer (CFRP) composites is gaining importance in high-end applications like aerospace to optimize the aerodynamic properties of structural components. However, the micro-drilling process in CFRPs remains challenging, particularly due to the complex and underexplored wear mechanisms of micro-drills. In the case of micro-drilling, the size effect plays a significant role, the ploughing dominancy is considerable and affects the chip formation mechanisms and the tool loading conditions, which are not strictly proportional to the rate of the tool wear. Consequently, the progression and modelling of wear of micro-drills in CFRPs cannot be directly implemented from macro-scale experiences. This study aims to develop a predictive model for flank wear of industrially used uncoated solid carbide micro-drills during CFRP machining. Thousands of holes were drilled to construct a general flank wear model, which was subsequently validated using additional experiments involving hundreds of holes. Tool wear was characterized through digital and scanning electron microscopy, while the influence of feed was analysed through analysis of variances (ANOVA). The developed general model incorporates feed and cutting length to predict micro-drills' flank wear accurately. The proposed model demonstrated high accuracy (maximum 13 % of main absolute percentage error) and robustness, offering a valuable tool for engineers to enhance process planning, maintain machining quality, predict remaining tool lifetime, and improve efficiency in composite micro-drilling operations.

{"title":"Modelling of tool wear incorporating various feeds in micro-drilling of carbon fibre-reinforced polymer (CFRP) composites","authors":"Szilárd Seprős, Balázs Markó, Norbert Geier","doi":"10.1016/j.wear.2025.206086","DOIUrl":"10.1016/j.wear.2025.206086","url":null,"abstract":"<div><div>Micro-drilling of carbon fibre-reinforced polymer (CFRP) composites is gaining importance in high-end applications like aerospace to optimize the aerodynamic properties of structural components. However, the micro-drilling process in CFRPs remains challenging, particularly due to the complex and underexplored wear mechanisms of micro-drills. In the case of micro-drilling, the size effect plays a significant role, the ploughing dominancy is considerable and affects the chip formation mechanisms and the tool loading conditions, which are not strictly proportional to the rate of the tool wear. Consequently, the progression and modelling of wear of micro-drills in CFRPs cannot be directly implemented from macro-scale experiences. This study aims to develop a predictive model for flank wear of industrially used uncoated solid carbide micro-drills during CFRP machining. Thousands of holes were drilled to construct a general flank wear model, which was subsequently validated using additional experiments involving hundreds of holes. Tool wear was characterized through digital and scanning electron microscopy, while the influence of feed was analysed through analysis of variances (ANOVA). The developed general model incorporates feed and cutting length to predict micro-drills' flank wear accurately. The proposed model demonstrated high accuracy (maximum 13 % of main absolute percentage error) and robustness, offering a valuable tool for engineers to enhance process planning, maintain machining quality, predict remaining tool lifetime, and improve efficiency in composite micro-drilling operations.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"574 ","pages":"Article 206086"},"PeriodicalIF":5.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-performance polymer composites for dust-tolerant extreme environment bearings for lunar exploration

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-16 DOI: 10.1016/j.wear.2025.206084

Jack Sorrell , Emerson Escobar Nunez , Andreas A. Polycarpou

The current study evaluates the tribological performance of vitrimer Aromatic thermosetting copolyester (ATSP), polyether ether ketone (PEEK), and Polyimide (PI) as high-performance polymers (HPPs) blended with different solid lubricants, such as Polytetrafluoroethylene (PTFE) and graphite (G), and reinforced with fillers such as Zylon, carbon nanotubes (CN), and carbon fibers (CF), as alternative materials for tribological components used during lunar exploration. Tribological experiments were performed using a pin-on-disk configuration under a dust environment to simulate the abrasive lunar regolith conditions encountered by different tribopairs under a normal load of 5 N, sliding speed of 0.25 m/s and unlubricated conditions in a N₂ environment at room temperature. Polymer-on-metal and polymer-on-polymer were the tribopairs employed to evaluate the friction, wear resistance, and capacity to mitigate the effect of dust during lunar exploration. Experimental results showed that vitrimer ATSP-based composites provide higher wear resistance and dust mitigation capacity as well as acceptable friction behavior, compared to other tribopair combinations.

{"title":"High-performance polymer composites for dust-tolerant extreme environment bearings for lunar exploration","authors":"Jack Sorrell , Emerson Escobar Nunez , Andreas A. Polycarpou","doi":"10.1016/j.wear.2025.206084","DOIUrl":"10.1016/j.wear.2025.206084","url":null,"abstract":"<div><div>The current study evaluates the tribological performance of vitrimer Aromatic thermosetting copolyester (ATSP), polyether ether ketone (PEEK), and Polyimide (PI) as high-performance polymers (HPPs) blended with different solid lubricants, such as Polytetrafluoroethylene (PTFE) and graphite (G), and reinforced with fillers such as Zylon, carbon nanotubes (CN), and carbon fibers (CF), as alternative materials for tribological components used during lunar exploration. Tribological experiments were performed using a pin-on-disk configuration under a dust environment to simulate the abrasive lunar regolith conditions encountered by different tribopairs under a normal load of 5 N, sliding speed of 0.25 m/s and unlubricated conditions in a N<sub>2</sub> environment at room temperature. Polymer-on-metal and polymer-on-polymer were the tribopairs employed to evaluate the friction, wear resistance, and capacity to mitigate the effect of dust during lunar exploration. Experimental results showed that vitrimer ATSP-based composites provide higher wear resistance and dust mitigation capacity as well as acceptable friction behavior, compared to other tribopair combinations.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"574 ","pages":"Article 206084"},"PeriodicalIF":5.3,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The polishing surface quality of single crystal diamond with GO green-enhanced diamond hybrid slurry and material removal mechanism analysis

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-15 DOI: 10.1016/j.wear.2025.206083

Zixuan Wang , Xueyan Hou , Ji Zhao , Jie Yao , Tianbiao Yu , Sheng Qu , Jun Zhao

Single crystal diamonds, which have extremely high hardness and brittleness, can provide lower power consumption and higher frequencies for electronic devices compared with other semiconductor materials. The chemical mechanical polishing method is usually used to realize the flattening of single crystal diamond workpiece. However, the conventional oxidants may cause damage to polishing tools and experimental equipment, and even lead to environmental pollution. Therefore, a graphene oxide green-enhanced diamond hybrid slurry was introduced in this study for single crystal diamond polishing with quartz glass as a polishing disk. The effect of graphene oxide on polishing surface quality was analyzed, and the polishing experiments were carried out with different polishing pressures and durations to investigate the influence of varying process parameters. The molecular dynamics method was used to simulate the formation and removal process of graphene oxide-induced degraded layer on single crystal diamond surface. The scratched morphologies on single crystal diamond surfaces were obtained, and the amorphization degree was analyzed to reveal the subsurface damage mechanism. The simulation shows that the oxygen-containing functional groups from graphene oxide chemically react with the carbon atoms on the single crystal diamond surface, removing in the form of CO, CO₂, or adhering to the abrasive grains. Also, the chemical adsorption reduced the activation energy of carbon atoms in single crystal diamond, and made it more loosely arranged and easier to be removed by mechanical scratching, which explained the experimental results.

{"title":"The polishing surface quality of single crystal diamond with GO green-enhanced diamond hybrid slurry and material removal mechanism analysis","authors":"Zixuan Wang , Xueyan Hou , Ji Zhao , Jie Yao , Tianbiao Yu , Sheng Qu , Jun Zhao","doi":"10.1016/j.wear.2025.206083","DOIUrl":"10.1016/j.wear.2025.206083","url":null,"abstract":"<div><div>Single crystal diamonds, which have extremely high hardness and brittleness, can provide lower power consumption and higher frequencies for electronic devices compared with other semiconductor materials. The chemical mechanical polishing method is usually used to realize the flattening of single crystal diamond workpiece. However, the conventional oxidants may cause damage to polishing tools and experimental equipment, and even lead to environmental pollution. Therefore, a graphene oxide green-enhanced diamond hybrid slurry was introduced in this study for single crystal diamond polishing with quartz glass as a polishing disk. The effect of graphene oxide on polishing surface quality was analyzed, and the polishing experiments were carried out with different polishing pressures and durations to investigate the influence of varying process parameters. The molecular dynamics method was used to simulate the formation and removal process of graphene oxide-induced degraded layer on single crystal diamond surface. The scratched morphologies on single crystal diamond surfaces were obtained, and the amorphization degree was analyzed to reveal the subsurface damage mechanism. The simulation shows that the oxygen-containing functional groups from graphene oxide chemically react with the carbon atoms on the single crystal diamond surface, removing in the form of CO, CO<sub>2</sub>, or adhering to the abrasive grains. Also, the chemical adsorption reduced the activation energy of carbon atoms in single crystal diamond, and made it more loosely arranged and easier to be removed by mechanical scratching, which explained the experimental results.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"574 ","pages":"Article 206083"},"PeriodicalIF":5.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of tribological behavior of atmospheric plasma sprayed (Ni-5wt% Al)-Bi coating at room temperature to 800 °C

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-14 DOI: 10.1016/j.wear.2025.206082

Huwei Sun , Peiying Shi , Benbin Xin , Juanjuan Chen , Gewen Yi , Shanhong Wan , Yu Shan , Wangjun Song

In this study, bismuth (Bi) was incorporated in a plasma sprayed Ni-5wt% Al coating. The results demonstrate that Bi reacts with ambient oxygen and the Ni matrix during spraying to produce δ-Bi₂O₃ and NiBi₃. The lubricity of Bi and δ-Bi₂O₃ enables the coating to exhibit low friction at 25 °C. However, the soft properties of Bi, δ-Bi₂O₃, and NiBi₃ reduce the hardness and low-temperature wear resistance of the coating. In particular, at 200 °C, the soft and brittle NiBi₃ increases the wear rate of the coating. Above 400 °C, with the phase transition from NiBi₃ to NiBi and intense tribo-oxidation reaction, the worn surface gradually forms a highly strong and tough tribo-layer, comprising NiBi, α-Bi₂O₃, δ-Bi₂O₃, NiO, Al₂O₃, and Bi₂₄Al₂O₃₉. Consequently, friction and wear decrease as the temperature increases. By 800 °C, the coating achieves optimal friction reduction and exhibits an antiwear behavior. Moreover, the tribo-layer formed at 800 °C provides a continuous antiwear effect even when the temperature drops below 400 °C.

{"title":"Study of tribological behavior of atmospheric plasma sprayed (Ni-5wt% Al)-Bi coating at room temperature to 800 °C","authors":"Huwei Sun , Peiying Shi , Benbin Xin , Juanjuan Chen , Gewen Yi , Shanhong Wan , Yu Shan , Wangjun Song","doi":"10.1016/j.wear.2025.206082","DOIUrl":"10.1016/j.wear.2025.206082","url":null,"abstract":"<div><div>In this study, bismuth (Bi) was incorporated in a plasma sprayed Ni-5wt% Al coating. The results demonstrate that Bi reacts with ambient oxygen and the Ni matrix during spraying to produce δ-Bi<sub>2</sub>O<sub>3</sub> and NiBi<sub>3</sub>. The lubricity of Bi and δ-Bi<sub>2</sub>O<sub>3</sub> enables the coating to exhibit low friction at 25 °C. However, the soft properties of Bi, δ-Bi<sub>2</sub>O<sub>3</sub>, and NiBi<sub>3</sub> reduce the hardness and low-temperature wear resistance of the coating. In particular, at 200 °C, the soft and brittle NiBi<sub>3</sub> increases the wear rate of the coating. Above 400 °C, with the phase transition from NiBi<sub>3</sub> to NiBi and intense tribo-oxidation reaction, the worn surface gradually forms a highly strong and tough tribo-layer, comprising NiBi, α-Bi<sub>2</sub>O<sub>3</sub>, δ-Bi<sub>2</sub>O<sub>3</sub>, NiO, Al<sub>2</sub>O<sub>3</sub>, and Bi<sub>24</sub>Al<sub>2</sub>O<sub>39</sub>. Consequently, friction and wear decrease as the temperature increases. By 800 °C, the coating achieves optimal friction reduction and exhibits an antiwear behavior. Moreover, the tribo-layer formed at 800 °C provides a continuous antiwear effect even when the temperature drops below 400 °C.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"574 ","pages":"Article 206082"},"PeriodicalIF":5.3,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of friction products and wear mechanism of plasma transfer arc welding Ni-WC coating at 200 °C and different load conditions

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-13 DOI: 10.1016/j.wear.2025.206080

Kuangxin Luo , Qi Yang , Guoping Li , Jing Lu , Hao Ma , Jiayi He , Ning Wu , Fenghua Luo

Ni-WC coating was prepared by plasma transfer arc welding. According to the application scenario of the pinch roll, the evolution of the friction products and wear mechanism of the coating when countering against the H13 steel under different friction loads at 200 °C was investigated. The results showed that at a friction load of 10–40 N, the main friction product was iron oxide generated on the H13 steel, and the oxides were transferred to the friction surface of the coating. When the load was 30 N, due to severe material transfer, the wear rate of the coating reached a maximum value of 13.73 × 10⁻⁵ mm³/(N·m). But when the load was 40 N, the formation of compacted oxide layer hindered the formation of stress concentration layer and reduced wear. When the load was 50 N, a continuous adhesive layer of iron-carbon oxide was formed, which further suppressed the formation of oxides and material transfer, thereby reducing the wear rate to 1.79 × 10⁻⁵ mm³/(N·m). When the friction load increased from 10-20 N–30 N, 40 N, and 50 N, the wear mechanism shifted from abrasive wear to oxidative and abrasive wear, oxidative wear, and adhesive wear in sequence.

通过等离子体转移电弧焊制备了 Ni-WC 涂层。根据夹辊的应用情况，研究了涂层在 200 ℃ 下与 H13 钢在不同摩擦载荷下的摩擦产物演变和磨损机理。结果表明，当摩擦载荷为 10-40 N 时，主要的摩擦产物是 H13 钢上产生的氧化铁，氧化物被转移到涂层的摩擦表面。当载荷为 30 N 时，由于材料转移严重，涂层的磨损率达到最大值 13.73 × 10-5 mm3/（N-m）。但当载荷为 40 N 时，压实氧化层的形成阻碍了应力集中层的形成，降低了磨损。当载荷为 50 N 时，形成了连续的铁碳氧化物粘附层，进一步抑制了氧化物的形成和材料的转移，从而将磨损率降低到 1.79 × 10-5 mm3/（N-m）。当摩擦载荷从 10-20 N 增加到 30 N、40 N 和 50 N 时，磨损机制依次从磨料磨损转变为氧化磨损、磨料磨损、氧化磨损和粘合磨损。

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引用次数: 0

Improving tribological performance of 3D-printed PEEK and CFR-PEEK composites by combining optimized deposition strategies and post-processing conditions

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-12 DOI: 10.1016/j.wear.2025.206079

Zhongcheng Cui , Wurikaixi Aiyiti , Ayiguli Kasimu , Lanlan Dong , Ru Jia , Cijun Shuai

Controlling the tribological performance of fused filament fabrication (FFF) components remains a challenge, which depends on the understanding of their wear mechanisms. In this study, the effects of deposition strategies (Top, Front, and Side, corresponding to sliding surfaces perpendicular to the building, transverse, and scanning directions, respectively) and annealing temperatures (200 °C, 250 °C, and 300 °C) on the anisotropic tribological performance of FFF-printed polyether ether ketone (PEEK) and short carbon fiber-reinforced PEEK (CFR-PEEK) were investigated. We used a 316 L stainless steel ball as the counterpart for reciprocating sliding wear tests under water-lubricated conditions, detailing how the shift in the wear mechanism is attributed to the combined effect of the interfacial weld strength of the deposited layers, the fiber-matrix bonding strength, and the matrix crystallinity. The results show that the specific combination of deposition strategy and annealing temperature can effectively improve the wear performance of FFF-PEEK composites. For CFR-PEEK, the wear performance of Top specimens was best at the annealing temperature of 200 °C, Front specimens at 300 °C, and Side specimens were unsatisfactory at all annealing temperatures. Furthermore, fiber orientation is the predominant factor in determining the anisotropic tribological performance of CFR-PEEK, but the effect of the deposited layer orientation on the anisotropy should not be neglected. The findings offer critical insights for optimizing the design and fabrication of FFF-PEEK components for tribological applications.

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引用次数: 0

Statistical modeling of multi-asperity wear and transfer in polymer-metal interfaces

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear

Pub Date : 2025-04-12 DOI: 10.1016/j.wear.2025.206078

Jiang Wei , Kun Liu , Xiaojun Liu , Yi Feng , Jiaxin Ye

Existing first-principle-based models have primarily addressed single-asperity interactions; however, the behavior of multiple contacting asperities remains inadequately understood. This study investigates the adhesive wear behavior and material transfer mechanisms of a multi-asperity interface in dry friction conditions, focusing on an alumina/polytetrafluoroethylene (PTFE) composite. By applying Rabinowicz's critical size criterion and Monte Carlo simulations, we analyzed the statistical wear characteristics of asperities. Our findings indicate that the simulated wear coefficient approximates 10⁻⁴, aligning well with experimental values. Additionally, the asperity size, material property, and their distribution strongly affect polymer wear behavior and material flow during the steady-state wear period. This research offers novel insights into the complex interactions at dry friction interfaces, paving the way for optimized material design and performance.

引用次数: 0

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