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Interface characteristics and wear resistance of Ni-B_(4)C plated ZTA reinforced high chromium cast iron composite

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China Foundry 2023年第3期20卷 253-262页

作者： Ke-liang Li Wei Li Yan-liang Yi Institute of Advanced wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China National Joint Engineering Research Center of High Performance Metal wear Resistant Materials Technology Jinan UniversityGuangzhou 510632China

A chemical composite plating of Ni-B_(4)C was used to prepare the surface-modified zirconia toughened alumina(ZTA)ceramic *** ceramic preforms were prepared by the plated ZTA and sodium silicate solution binder,followed by casting infiltration to prepare the ZTA particles reinforced high chromium cast iron(HCCI)*** result reveals that a distinct interface layer forms at the ZTA/HCCI interface,which consists of phases of ZrB_(2),FeB,Fe_(2)B,and NaSiO_(4).The interfacial wettability between ZTA and HCCI is improved by the diffusion and reaction of Ni and B_(4)*** wear test reveals that the Ni-B_(4)C plated ZTA particles can effectively improve the wear resistance of the ZTA/HCCI composite,and the wear rate of the composite is decreased to 11.6%of HCCI.

关键词： ZTA composite high chromium cast iron interface layer three-body abrasive wear

Tribology of multilayer coatings for wear reduction: A review

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Friction 2017年第3期5卷 248-262页

作者： Mahdi KHADEM Oleksiy V.PENKOV Hee-Kyung YANG Dae-Eun KIM Department of Mechanical Engineering Yonsei University Seoul 03722 Republic of KoreaCenter for Nano-Wear Yonsei University Seoul 03722 Republic of Korea Center for Nano-wear Yonsei University Seoul 03722 Republic of Korea Department of Mechanical Engineering Yonsei University Seoul 03722 Republic of Korea

Friction and wear phenomena encountered in mechanical systems with moving components are directly related to efficiency,reliability and life of the ***,minimizing and controlling these phenomena to achieve the desired system performance is *** the numerous strategies developed for reducing friction and wear,coatings have been successfully utilized in various engineering applications to mitigate tribological *** of the benefits of coatings is that they may be fabricated using a variety of materials in several different forms and structures to satisfy the requirements of the operating *** many types,coatings that are comprised of a combination of materials in the form of a multilayer have been gaining much interest due to the added degree of freedom in tailoring the coating *** this paper,the properties and development status of multilayer coating systems for tribological applications were reviewed with the aim to gain a better understanding regarding their advantages and ***,focus was given to Ti-based and Cr-based coatings since Ti and Cr were identified as important elements in multilayer coating *** was given to materials,design concepts,mechanical properties,deposition method,and friction and wear characteristics of these types of coatings.

关键词： multilayer coating friction wear tribology

60 years of Rabinowicz' criterion for adhesive wear

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Friction 2018年第3期6卷 341-348页

作者： Elena POPOVA Valentin L.POPOV Dae-Eun KIM Institute of Mechanics Technische Universit?t Berlin School of Mechanical Engineering Yonsei University Center for Nano-wear Yonsei University

60 years ago, in 1958, Ernest Rabinowicz published a 5 page paper titled "The effect of size on the looseness of wear fragments" where he suggested a criterion determining the minimum size of wear particles. The criterion of Rabinowicz is based on the consideration of the interplay of elastic energy stored in "asperities" and the work of separation needed for detaching a wear particle. He was probably the first researcher who explicitly emphasized the role of adhesion in friction and wear. In a recent paper in Nature Communications, Aghababaei, Warner and Molinari confirmed the criterion of Rabinowicz by means of quasi-molecular dynamics and illustrated the exact mechanism of the transition from plastic smoothing to formation of wear debris. This latter paper promoted the criterion of Rabinowicz to a new paradigm for current studies of adhesive wear. The size arguments of Rabinowicz can be applied in the same form also to many other problems, such as brittle-ductile transition during indentation, cutting of materials or ultimate strength of nano-composites.

关键词： adhesion plasticity wear Archard's law of wear Rabinowicz criterion surface topography history of Tribology

Microstructure and wear resistance of highchromium cast iron containing niobium

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China Foundry 2014年第3期11卷 179-184页

作者： Zhang Zhiguo Yang Chengkai Zhang Peng Li Wei Department of Materials Science and Engineering Jinan University Engineering Research Center for wear Resistant Materials Jinan University

In the paper, the effect of niobium addition on the microstructure, mechanical properties and wear resistance of high chromium cast iron has been studied. The results show that the microstructure of the heattreated alloys is composed of M7C3 and M23C6 types primary carbide, eutectic carbide, secondary carbide and a matrix of martensite and retained austenite. NbC particles appear both inside and on the edge of the primary carbides. The hardness of the studied alloys maintains around 66 HRC, not significantly affected by the Nb content within the selected range of 0.48%-0.74%. The impact toughness of the alloys increases with increasing niobium content. The wear resistance of the specimens presents little variation in spite of the increase of Nb content under a light load of 40 N. However, when heavier loads of 70 and 100 N are applied, the wear resistance increases with increasing Nb content.

关键词： high chromium cast irons NbC,hardness impact toughness wear resistance

Study on dry friction and wear resistance of a WC-Co particle reinforced iron matrix composite material

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China Foundry 2013年第3期10卷 135-140页

作者： Zhang Peng Zeng Shaolian Zhang Zhiguo Li Wei Department of Materials Science and Engineering Jinan University Engineering Research Centre of wear Resistant Materials Jinan University

In order to select a suitable material for the rolling mill guide application, the dry sliding friction and wear resistance of a tungsten carbide combining cobalt (WC-Co) particle reinforced chromium cast iron composite material were studied. In particular, the wear resistance was discussed in detail. The results showed that the composite material demonstrates 25 times the wear resistance of high Cr cast iron, and 9 times the wear resistance of heat resistant steel. However, the average friction factor in the stable friction stage showed a relationship of μComposites/45#steel>μHigh chromium cast iron/45#steel>μHeat resistant steel/45 # steel. The wear resistance mechanism of the composite material was associated with the reinforcing particles, which protruded from the worn surface to bear the friction load when the matrix material surface was worn, thereby reducing the abrasive and adhesive wear. In addition, the matrix material possessed suitable hardness and toughness, providing a support to the reinforcements.

关键词： particle reinforcement composite material high Cr cast iron friction and wear

Friction of Alloys at High Temperature

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Journal of Materials Science & Technology 1994年第5期10卷 313-320页

作者： M.B.Peterson (wear Sciences, 925 Mallard Circle, Arnold Maryland 21012, USA)(To whom correspondence should be addressed)S.J.Calabrese (Rensselaer Polytechnic Institute, Troy, NY, USA)Shizhuo LI and Xiaoxia JIANG (Institute of Metal Research, Chinese Acad wear Sciences Arnold United States

A brief review is given about the friction and wear properties of high temperature alloys. Above a critical temperature, if the oxide becomes ductile, it will flow over the surface and prevent metal-to-metat contact. In order to study the tribology of oxide lubrication. a series of tests were carried out using Cu(ReO4)2 as a lubricant. The effects of time. Surface finish. substrates. load and temperature were investigated. A mechanism of lubrication is proposed in which the surface slip predominates along with mechanical attachment of oxide to the surface.

关键词： Re Cu Friction of Alloys at High Temperature ADA Ni

Friction and wear Properties of High-velocity Oxygen Fuel Sprayed WC-17Co Coating under Rotational Fretting Conditions

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Chinese Journal of Mechanical Engineering 2016年第3期29卷 515-521页

作者： LUO Jun CAI Zhenbing MO Jiliang PENG Jinfang ZHU Minhao Tribology Research Institute Southwest Jiaotong UniversityChengdu 610031China Engineering Research Center for Materials Protection of wear and Corrosion of Guizhou Provincial Universities Guiyang University Guiyang 550005China

Rotational fretting which exist in many engineering applications has incurred enormous economic loss. Thus, accessible methods are urgently needed to alleviate or eliminate damage by rotational fretting. Surface engineering is an effective approach that is successfully adopted to enhance the ability of components to resist the fretting damage. In this paper, using a high-velocity oxygen fuel sprayed（HVOF） technique WC-17 Co coating is deposited on an LZ50 steel surface to study its properties through Vickers hardness testing, scanning electric microscope（SEM）, energy dispersive X-ray spectroscopy（EDX）, and X-ray diffractrometry（XRD）. Rotational fretting wear tests are conducted under normal load varied from 10 N to 50 N, and angular displacement amplitudes vary from 0.125° to 1°. wear scars are examined using SEM, EDX, optical microscopy（OM）, and surface topography. The experimental results reveal that the WC-17 Co coating adjusted the boundary between the partial slip regime（PSR） and the slip regime（SR） to the direction of smaller amplitude displacement. As a result, the coefficients of friction are consistently lower than the substrate＇s coefficients of friction both in the PSR and SR. The damage to the coating in the PSR is very slight. In the SR, the coating exhibits higher debris removal efficiency and load-carrying capacity. The bulge is not found for the coating due to the coating＇s higher hardness to restrain plastic flow. This research could provide experimental bases for promoting industrial application of WC-17 Co coating in prevention of rotational fretting wear.

关键词： fretting wear rotational fretting WC-17Co coating LZ50 steel HVOF

Vascular emergencies in cholelithiasis and cholecystectomy: our experience with two cases and literature review

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Hepatobiliary & Pancreatic Diseases International 2008年第2期7卷 217-220页

作者： Narasimhaiah Srinivasaiah Maneesh Bhojak Ralph Jackson Sean Woodcock Department of Surgery North Tyneside General Hospital Tyne and Wear UK Department of Radiology Freeman Hospital Tyne and Wear UK

BACKGROUND:Complications from gallstones and laparoscopic cholecystectomy can be serious and fatal if there is a delay in recognition and treatment. We aim to present two unusual, life threatening vascular complications as a result of gallstones and laparoscopic cholecystectomy. Their management is highlighted with a brief review of literature. METHODS:Data for the article were gathered from clinical case note review. Radiology database was used for images. A brief literature review was undertaken using Pubmed search. The keyword used included hemobilia, pseudoaneurysm, arterio-biliary fistula and laparoscopic cholecystectomy. RESULTS:The article highlights two individual case reports. The first case constitutes an 81-year woman who had cystic arterial erosion causing hematemesis, while the second patient was a 57-year man who presented with hemobilia from a pseudoaneurysm of right hepatic artery (RHA) following laparoscopic cholecystectomy. Cystic arterial erosion was treated with subtotal cholecystectomy with duodenal defect closure while the pseudoaneurysm underwent radiological intervention. CONCLUSIONS:Cystic artery erosion and pseudoaneurysm causing arteriobiliary fistula are rare vascular complications related to the biliary tree. A high index of suspicion and timely intervention is important. Trauma to arteries should be avoided during laparoscopic cholecystectomy.

关键词： laparoscopic cholecystectomy hemobilia hematemesis pseudoaneurysm

wear behavior and nano-structure of surface layers of Hadfield steel under impact loading

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Progress in Natural Science:Materials International 2001年第6期11卷 49-55页

作者：许云华陈瑜眉朱金华 China China Institute of wear Resistance Materials State Key Laboratory for Mechanical Behavior of Materials Xi’an 710055 Xi’an Jiaotong University Xi’an University of Architecture and Technology Xi’an710049

Under high energy impact contact loading, a turning on the weight loss-impact cycle ( WL-N) curve has been found, which results from the formation of nano-sized grains embedded in amorphous in the surface layers of Hadfield steel. As the impact energy increases, the wear rate, dWL/dN, first increases then decreases. The nano-structure due to the accumulation of plastic deformation is composed of nano-sized grains spanning 10 - 50 atoms and amorphous structures.

关键词： Hadfield steel impact wear nano-sized grains amorphous structure.