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High-temperature tribological performance of functionally graded Stellite 6/WC metal matrix composite coatings manufactured by laser-directed energy deposition

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Friction 2024年第3期12卷 522-538页

作者： Marta OSTOLAZA Alaitz ZABALA Jon Inaki ARRIZUBIETA Iñigo LLAVORI Nagore OTEGI aitzol lamikiz Department of Mechanical Engineering University of the Basque Country UPV/EHUPlaza Torres Quevedo 1Bilbo 48013Spain Faculty of Engineering Mechanics and Industrial ProductionMondragon UnibertsitateaLoramendi 4Mondragon 20500Spain

Wear-driven tool failure is one of the main hurdles in the *** issue can be addressed through surface coating with ceramic-reinforced metal matrix ***,the maximum ceramic content is limited by *** this work,the tribological behaviour of the functionally graded WC-ceramic-particlereinforced Stellite 6 coatings is *** that end,the wear resistance at room temperature and 400°C is ***,the tribological analysis is supported by crack sensitivity and hardness evaluation,which is of utmost importance in the processing of composite materials with *** indicate that functionally graded materials can be employed to increase the maximum admissible WC content,hence improving the tribological behaviour,most notably at high ***,a shift from abrasive to oxidative wear is observed in high-temperature wear testing.

关键词： friction coating metal matrix composite functionally graded materials high temperature laserdirected energy deposition

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Vibrations characterization in milling of low stiffness parts with a rubber-based vacuum fixture

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Chinese Journal of Aeronautics 2021年第6期34卷 54-66页

作者： Antonio RUBIO-MATEOS Mikel CASUSO Asuncion RIVERO Eneko UKAR aitzol lamikiz TECNALIA Basque Research and Technology Alliance(BRTA)Paseo Mikeletegi 7Pcirque TecnologicoE-20009 San SebastianSpain University of the Basque Country(UPV/EHU) ETTSII–Department of Mechanical EngineeringC/Alameda de Urquijo s/nE-48013 BilbaoSpain

Fixtures are a critical element in machining operations as they are the interface between the part and the *** components are responsible for the precise part location on the machine table and for the proper dynamic stability maintenance during the manufacturing *** these two features are deeply related,they are usually studied *** the one hand,diverse adaptable solutions have been developed for the clamping of different variable ***,the stability of the part has been long studied to reduce the forced vibration and the chatter effects,especially on thin parts machining operations typically performed in the aeronautic field,such as the skin panels *** present work proposes a commitment between both features by the presentation of an innovative vacuum fixture based on the use of a vulcanized rubber *** solution presents high flexibility as it can be adapted to different geometries while providing a proper damping capacity due to the viscoelastic and elastoplastic behaviour of these ***,the sealing properties of these elastomers provide the perfect combination to transform a rubber layer into a flexible vacuum ***,in order to validate the suitability of this fixture,a test bench is manufactured and tested under uniaxial compression loads and under real finish milling conditions over AA2024 part ***,a roughness model is proposed and analysed in order to characterize the part vibration sources.

关键词： AA2024 aeronautic skin Chatter Damping Finish milling Rubber characterization Vacuum clamping

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