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Influence of particulate morphology on microstructure and tribological properties of cold sprayed A380/Al2O3 composite coatings

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Journal of Materials Science & Technology 2020年第9期44卷 9-18页

作者： Xiang Qiu Naeem ul Haq Tariq Lu Qi Jun-Rong Tang Xin-Yu Cui Hao Du Ji-Qiang Wang Tian-Ying Xiong Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Department of Metallurgy and Materials Engineering Pakistan Institute of Engineering and Applied SciencesNiloreIslamabadPakistan

In this study,three kinds of A380/Al2O3 composite coatings were prepared by cold spray(CS)using spherical,irregular and spherical+irregular shaped Al2O3 particulates separately mixed in the original A380 alloy *** influence of Al2O3 particulates’morphology on the microstructural characteristics(*** of Al2O3 content in coatings,coating/matrix interfacial bonding,pore size distribution and morphology etc.)and wear performance of the coatings was investigated by scanning electron microscopy(SEM),X-ray computed tomography(XCT)and 3-D optical *** indicated that the spherical Al2O3 showsobvious tamping effect during deposition *** a result,the interfaceshowedawavy shape while the matrix and particulates were mechanical interlocked with much improved *** addition,the porosity of the coating was minimized and the pores exhibited curved spherical structure with reduced *** irregular Al2O3 particles predominantly displayed the embedding effect together with fragmentation of Al2O3 ***,poor coating/matrix interfacial bonding,high porosity and the formation of angular-shaped pores were resulted in the *** sliding wear tests results revealed that the wear resistance of the coating is directly related with the retained content of Al2O3 in the *** coating containing irregular Al2O3 particulates displayed superior wear performance with its wear rate one seventh of that of the pure A380 alloy *** coating containing both kinds of Al2O3 particulates showed mixed characteristics of above two kinds of Al2O3 composite coatings.

关键词： Cold spray Al2O3 particulates X-ray computed tomography wear test

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Effect of austenitization temperature on microstructure and mechanical properties of low-carbon-equivalent carbidic austempered ductile iron

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International Journal of Minerals,Metallurgy and Materials 2018年第7期25卷 770-778页

作者： vinayak dakre d.r.peshwe s.u.pathak ajay likhite Department of Metallurgical ＆ Materials Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India

The wear resistances of austempered ductile iron （ADI） were improved through intxoduction of a new phase （carbide） into the ma- txix by addition of chromium. In the present investigation, low-caxbon-equivalent ductile iron （LCEDI）（CE = 3.06%, and CE represents cax- bon-equivalent） with 2.42% chromium was selected. LCEDI was austeintized at two difl＇erent temperatures （900 and 975~C） a^ld soaked for 1 h and then quenched in a salt bath at 325~C for 0 to 10 h. Samples were analyzed using optical microscopy and X-ray diffraction. wear tests were carded out on a pin-on-disk-type machine. The efl＇ect of austenization temperature on the wear resistance, impact strength, and the mi- crostructure was evaluated. A stxucture-property correlation based on the observations is established.

关键词： low carbon equivalent ductile iron (LCEDI) caxbidic austempered ductile iron (CADI) wear test austenitization temperature impact strength

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Laser Cladding of Cold-Work Tool Steel by Pulse Shaping

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Journal of Materials Science & Technology 2011年第8期27卷 707-713页

作者： Matej Pleterski Janez Tuek Tadej Muhic Ladislav Kosec Faculty of Mechanical Engineering University of Ljubljana Akereva cesta 6 TKC D.O.O. Trnovska Ulica 8 Faculty of Natural Sciences and Engineering University of Ljubljana Akereva Cesta 12

Repair welding of cold-work tool steels in cold is very risky and almost impossible by conventional processes. The application of pulse shaping in laser cladding with wire to avoid the solidification problems in relevant steel is demonstrated. The results show that sound remelting and/or cladding can be achieved by the right selection of laser parameters and pulse shape, i.e. long pulse duration, moderate pulse peak powers and ramped-down pulse shape. Despite the defects and softening in the cladding due to the formation of retained austenite, the cladding shows better wear resistance at lower loads compared to the heat-treated base material.

关键词： Laser cladding Repair welding Tool steel wear test

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TRIBOLOGICAL AND HIGH SPEED TURNING PERFORMANCE IN Ti_(1-x)Al_(x)N COATINGS PREPARED BY CLOSE-FIELD UNBALANCED MAGNETRON SPUTTERING

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 254-260页

作者： P.W.Shum M.Escursell T.H.Wong K.Y.Li Z.F.Zhou Y.G.Shen Advanced Coatings Applied Research Laboratory(ACARL) Department of Manufacturi ng Engineering and Engineering ManagementCity University of Hong KongKowloonHong KongChina

Titanium-aluminium-nitride(Ti_(1-x)Al_(x)N)coatings were deposited by close-field un balanced magnetron sputtering on M42 steel substrates and WC-6wt%Co inserts at 450℃.The tribological behavior was analyzed by sliding against steel and WC-6wt%Co balls,while the turning performance was evaluated by a conventional tu rning machine at high cutting speeds without using *** the tribological tests,the formation of transfer layer and the variations of hardness of the co atings played an important role for sliding against steel *** the coating s sliding against WC-6wt%Co balls,the Ti-Al-N coatings showed a similar frictio n coefficient,but the TiN coating exhibited a lower *** difference could be explained by the tri-oxidation wear *** the turning tests,a super ior cutting performance of the coating was found at x=0.45,which endured 38 min utes before the tool flank wear reached the maximum value of 0.3mm,whereas only 20 minutes were endured for the TiN *** excellent performance of the c oatings in the turning tests could be explained by the enhanced mechanical prope rties and oxidation/diffusion resistance of the coatings.

关键词： hardness Ti-Al-N coating tribology turning test wear test

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Experimental Study on Surface Deterioration of Hot Rolling Mill Rolls under Near Service Conditions

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Journal of Iron and Steel Research International 1996年第1期3卷 46-50页

作者： Cui Peiyong Central Iron and Steel Research Institute MMI

With specially designed hot rolling test equipment,the surface deterioration process of hot rolling mill rolls can be simulated and representative samples were *** a series of micro-analyses can be done onto the sample's worn surface,including wear loss,worn surface morphology,wear mode,oxidation and other influences from environment conditions.A leading study has been done with a high chromium cast iron to show the rolling test conditions and the methodologies of follow-up investigations for all the above-mentioned *** results have shown that high chromium iron roll may undergo complex degrading mechanism,and most of them can be investigated with the help of this research method-

关键词： wear test surface deterioration hot wear rolling mill roll chromium iron

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Study on Preparation and Engine Bench test of Friction-Reducing and Repairing Additive to Lubricating Oils

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China Petroleum Processing & Petrochemical Technology 2003年第4期5卷 57-62页

作者： ShiPeijing QiaoYulin XuBinshi MaShining NationalKeyLaboratoryforRemanufacturing ArmoredForceEngineeringInstituteBeijing100072

A new kind of friction-reducing and repairing additive containing nano-scale copper and rare earth compounds were prepared by means of synthesis and compounding methods. The performance of the said additive was investigated by engine bench test, and was compared to the performance of similar domestic and imported additives. The deterioration of lube oils containing additives over different time intervals was studied by means of plasma spectrometry and mass spectrometry, and the effect of additive package on engine power was also studied. test results have revealed that the synthetic additive package can provide good anti-wear performance to the tribo-pairs. In particular, after 300 hour application of the said additive package the connection rod shaft and copper sleeve showed 'zero wear' to achieve the in situ dynamic repairing of tribo-pairs. Application of the said synthetic additive can effectively improve the engine power performance and extend the engine service life.

关键词： rare earths additive copper wear test

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Comparison of wear behaviour of LM13 Al−Si alloy based composites reinforced with synthetic(B_(4)C)and natural(ilmenite)ceramic particles

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3613-3625页

作者： Rahul GUPTA Tarun NANDA O.P.PANDEY Mechanical Engineering Department Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia School of Physics and Materials Science Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia

Dry sliding wear behaviour of stir-cast aluminium matrix composites(AMCs)containing LM13 alloy as matrix and ceramic particles as reinforcement was *** different ceramic particle reinforcements were used separately:synthetic ceramic particles(B_(4)C),and natural ceramic particles(ilmenite).Optical micrographs showed uniform dispersion of reinforced particles in the matrix *** particles refined the grain size of eutectic silicon and changed its morphology to globular type.B_(4)C reinforced composites(BRCs)showed maximum improvement in hardness of *** reinforced composites(IRCs)showed maximum reduction in coefficient of friction values due to strong matrix−reinforcement interfacial bonding caused by the formation of interfacial *** sliding wear behaviour of composites was significantly improved as compared to base *** low density and high hardness of B_(4)C particles resulted in high dislocation density around filler particles in *** the other hand,the low thermal conductivity of ilmenite particles resulted in early oxidation and formation of a tribo-layer on surface of ***,both types of reinforcements led to the improvement in wear properties of AMCs,though the mechanisms involved were very ***,the low-cost ilmenite particles can be used as alternative fillers to the high-cost B_(4)C particles for processing of wear resistant composites.

关键词： aluminium matrix composites ilmenite boron carbide particle-reinforcement wear test tribolayer XRD analysis SEM−EDS

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Rheological,mechanical,thermal,tribological and morphological properties of PLA-PEKK-HAp-CS composite

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Journal of Central South University 2021年第6期28卷 1615-1626页

作者： GURCHETAN Singh RANVIJAY Kumar RUPINDER Singh MD MUSTAFIZUR Rahman SEERAM Ramakrishna Department of Production Engineering Guru Nanak Dev Engineering CollegeLudhiana 141106India Department of Mechanical Engineering University Center for Research and DevelopmentChandigarh UniversityMohali 140413India Department of Mechanical Engineering National Institute of Technical Teachers Training and ResearchChandigarh 160019India Department of Mechanical Engineering Universiti Malaysia PahangPahang 26600Malaysia Department of Mechanical Engineering National University of Singapore119077Singapore

The present study reports investigations on rheological,mechanical,thermal,tribological and morphological properties of feedstock filaments prepared with polylactic acid-polyether ketone ketone-hydroxyapatite-chitosan(PLA-PEKK-HAp-CS)composite for 3D printing of functional *** study consists of a series of melt processing operations on melt flow index(MFI)setup as per ASTM D-1238 for melt flow certainty followed by fixation of reinforcement composition/proportion as 94%PEKK-4%HAp-2%CS(B)by mass in PLA matrix(A).The blending of reinforcement and preparation of feedstock filament for fused deposition modeling(FDM)set up has been performed on commercial twin screw extruder(TSE).The results of study suggest that feedstock filaments prepared with blend of 95%A-5%B(by mass)at 200℃processing temperature and 100 r/min rotational speed on TSE resulted into better tensile properties(35.9 MPa peak strength and 32.3 MPa break strength)with 6.24%surface porosity,42.67 nm surface roughness(R_(a))and acceptable heat capacity(2.14 J/g).However as regards to tribological behavior,the minimum wear of 316μm was observed for sample with poor tensile *** regards to crash application for scaffolds the maximum toughness of 1.16 MPa was observed for 85%A-15%B(by mass)at 200℃processing temperature and 150 r/min rotational speed on TSE.

关键词： polylactic acid-polyether ketone ketone-hydroxyapatite-chitosan(PLA-PEKK-HAP-CS) twin screw extruder(TSE) differential scanning calorimetry(DSC) melt flow index(MFI) wear test

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A Comparative Study on Dry Sliding wear Characteristics of Al₂O₃ and Bone Powder Filled Hybrid Composites

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Journal of Minerals and Materials Characterization and Engineering 2016年第2期4卷 164-180页

作者： Sudeep Deshpande T. Rangaswamy Department of Mechanical Engineering SKSVMACET Laxmeshwar India Department of Mechanical Engineering G. E. C. Hassan India

The aim of the research was to develop E-glass/jute fiber reinforced epoxy composites with an addition of Al2O3 and bone powder by using hand layup technique and to compare tribological properties of these composites under similar test conditions. The wear experiments were designed according to Taguchi’s (L27) orthogonal array with three control variables such as sliding velocity, filler content and normal load. The results indicated that the normal load for Al2O3 and filler content for bone powder emerged as the significant factors affecting specific wear rate of hybrid composites. An addition of 10 wt% of bone powder or Al2O3 into E-glass/jute fiber reinforced epoxy composites increased the wear resistance considerably, and natural waste bone powder can be used instead of ceramic filler Al2O3 in hybrid composites. After the analysis of control factors, an optimal factor setting has been suggested for specific wear rate and coefficient of friction. Further, the scanning electron microscopy (SEM) images for worn surfaces of hybrid composites were studied. Finally, a confirmation test was carried out to validate the results.

关键词： Al2O3 Bone Powder wear test Taguchi Analysis SEM

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Topside Axial Bearing wear Under the Eccentric Load of a Single-Anchor Leg Mooring System in Bohai Bay

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Journal of Marine Science and Application 2021年第2期20卷 371-380页

作者： Shuo Yang Offshore Department Bureau VeritasShanghai 200011China

Because the applications of single-anchor leg mooring yoke systems(SYSs)are rarely studied in the offshore industry,the design of such systems features some *** paper investigated the effect of eccentricity on the wear of the topside axial bearing of a *** eccentricity of the topside was verified by on-site inspection,and the axial bearing wear was found to be far more serious than the original *** contact status between the axial bearing and flange surface was studied on the basis of the actual topside load by using nonlinear finite element *** tests of the topside bearing under uniform and eccentric loads were also performed to study the effect of eccentric loads on the wear *** key parameters obtained from numerical simulations and experimentation were used to calculate the wear depth via a simplified linear wear model based on the product of the pressure and sliding *** showed that eccentric loads are the main factor responsible for the excessive wear of topside axial bearings.

关键词： Single-anchor leg mooring Yoke system Nonlinear finite element analysis wear test Topside axial bearing

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