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首页> 外文期刊>RSC Advances >Mechanical and tribological performance of a hybrid MMC coating deposited on Al-17Si piston alloy by laser composite surfacing technique
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Mechanical and tribological performance of a hybrid MMC coating deposited on Al-17Si piston alloy by laser composite surfacing technique

机译：通过激光复合表面沉积在Al-17Si活塞合金上的混合MMC涂层的机械和摩擦学性能

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摘要

Laser composite surfacing (LCS) is a photon driven manufacturing technology that can be utilized for depositing hybrid metal matrix composite coatings (HMMC) on softer Ti/Al/Mg alloys to enhance their tribo-mechanical properties. LCS offers the advantages of higher directionality, localized microstructural refinement and higher metallurgical bonding between coating and substrate. The current research presents the tribo-mechanical evaluation and characterization of solid lubricant based Ni-WC coatings deposited by LCS on Al-Si piston alloy by varying the concentration of graphite between 5-to-15-weight percentage. The tribological behavior of LCS samples was investigated using a ball-on-plate tribometer. Results indicate that the surface hardness, wear rate and friction coefficient of the Al-Si hypereutectic piston alloy were improved after LCS of graphite based HMMC coatings. The maximum surface hardness of 781Hv was acquired for the Ni-WC coating containing 5 wt% graphite. The friction coefficient of Al-Si under dry sliding conditions was reduced from 0.47 to 0.21. The reduction in the friction coefficient was attributed to the formation of a shearable transfer layer, which prevented delamination and reduced adhesion, abrasion and fatigue cracking.
机译：激光复合表面（LCS）是光子驱动的制造技术，可用于沉积在更软的Ti / Al / Mg合金上的杂种金属基质复合涂层（HMMC），以增强其摩擦机械性能。 LCS提供了较高方向性，局部微观结构细化和涂层和基材之间更高的冶金键合的优点。目前的研究介绍了通过在Al-Si活塞合金上沉积的LCS沉积的固体润滑剂基Ni-WC涂层的摩擦力评价和表征，通过改变5％至15重量％的石墨浓度。使用球形摩擦计研究了LCS样品的摩擦学行为。结果表明，在基于石墨的HMMC涂层的LCS之后，改善了Al-Si过度化活塞合金的表面硬度，磨损率和摩擦系数。获得含有5wt％石墨的Ni-WC涂层的781HV的最大表面硬度。干式滑动条件下Al-Si的摩擦系数从0.47降低至0.21。摩擦系数的降低归因于形成可覆离的转移层，其防止分层和降低的粘附性，磨损和疲劳裂化。

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  • 来源
    《RSC Advances》 |2018年第13期|共12页
  • 作者

    Quazi M. M.; Ishak M.; Arslan A.; Fazal M. A.; Yusof Farazila; Sazzad B. S.; Bashir M. Nasir; Jamshaid M.;

  • 作者单位

    Univ Malaysia Pahang Dept Mech Engn Fac Engn Pekan 26600 Malaysia;

    Univ Malaysia Pahang Dept Mech Engn Fac Engn Pekan 26600 Malaysia;

    Univ Malaya Dept Mech Engn Fac Engn Kuala Lumpur 50603 Malaysia;

    Univ Malaya Dept Mech Engn Fac Engn Kuala Lumpur 50603 Malaysia;

    Univ Malaya Dept Mech Engn Fac Engn Kuala Lumpur 50603 Malaysia;

    Int Univ Business Agr &

    Technol Dept Mech Engn Dhaka Bangladesh;

    Univ Malaya Dept Mech Engn Fac Engn Kuala Lumpur 50603 Malaysia;

    Univ Malaya Dept Mech Engn Fac Engn Kuala Lumpur 50603 Malaysia;

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  • 正文语种 eng
  • 中图分类 化学;
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