The Experts below are selected from a list of 26424 Experts worldwide ranked by ideXlab platform

Haowei Wang - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of self lubricating Coating on aluminum and its frictional behaviour
    Applied Surface Science, 2007
    Co-Authors: Haowei Wang, Hui Wang
    Abstract:

    Abstract A Self-Lubricating anodic film has been formed on aluminum by anodization in phosphoric acid–base electrolyte and a subsequent technique containing ultrasonic impregnation and heat treatment. The results show that the ultrasonic impregnation after anodization of aluminum in an electrolyte of phosphoric acid and some additives can fill some PTFE into the holes of alumina and the surface hardness decreases little within appropriate ultrasonic time. The final heat treatment technology can increase the Coating hardness greatly, especially to the alumina acquired by general anodization. With this fabricating method, the properties of anti-attrition and abrasion resistance of Self-Lubricating Coating improved greatly.

Hui Wang - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of self lubricating Coating on aluminum and its frictional behaviour
    Applied Surface Science, 2007
    Co-Authors: Haowei Wang, Hui Wang
    Abstract:

    Abstract A Self-Lubricating anodic film has been formed on aluminum by anodization in phosphoric acid–base electrolyte and a subsequent technique containing ultrasonic impregnation and heat treatment. The results show that the ultrasonic impregnation after anodization of aluminum in an electrolyte of phosphoric acid and some additives can fill some PTFE into the holes of alumina and the surface hardness decreases little within appropriate ultrasonic time. The final heat treatment technology can increase the Coating hardness greatly, especially to the alumina acquired by general anodization. With this fabricating method, the properties of anti-attrition and abrasion resistance of Self-Lubricating Coating improved greatly.

Huidi Zhou - One of the best experts on this subject based on the ideXlab platform.

  • ysz mos2 self lubricating Coating fabricated by thermal spraying and hydrothermal reaction
    Ceramics International, 2018
    Co-Authors: Shuangjian Li, Yulong An, Xiaoqin Zhao, Huidi Zhou
    Abstract:

    Abstract Thermal sprayed ceramic Coatings have extensively been used in components to protect them against friction and wear. However, the poor lubricating ability severely limits their application. Herein, yttria-stabilized zirconia (YSZ)/MoS 2 composite Coatings were successfully fabricated on steel substrate with the combination of thermal spraying technology and hydrothermal reaction. Results show that the synthetic MoS 2 powders are composed of numbers of ultra-thin sheets (about 7 ~ 8 nm), and the sheet has obvious lamellar structure. After vacuum impregnation and hydrothermal reaction, numbers of MoS 2 powders, look like flowers, generate inside the plasma sprayed YSZ Coating. Moreover, the growing point of the MoS 2 flower is the intrinsic micro-pores of YSZ Coating. The friction and wear tests under high vacuum environment indicate that the composite Coating has an extremely long lifetime (> 100,000 cycles) and possesses a low friction coefficient less than 0.1, which is lower by about 0.15 times than that of YSZ Coating. Meanwhile, the composite shows an extremely low wear rate (2.30 × 10 −7 mm 3 N −1 m −1 ) and causes slight wear damage to the counterpart. The excellent lubricant and wear-resistant ability are attributed to the formation of MoS 2 transfer films and the ultra-smooth of the worn surfaces of hybrid Coatings.

  • reusable chromium oxide Coating with lubricating behavior from 25 to 1000 c due to a self assembled mesh like surface structure
    Surface & Coatings Technology, 2017
    Co-Authors: Nairu He, Hongxuan Li, Li Ji, Huidi Zhou
    Abstract:

    Abstract The chromium oxide Coatings are deposited on Ni-based high-temperature alloy substrates through an arc ion plating system and then annealed at 1000 °C in air for 2 h. During annealing process, Ti and Cr atoms in the substrate diffuse to Coating surface and lead to the formation of a mesh-like heave structure comprised of Cr 2 O 3 and Cr 2 Ti 7 O 17 phases. The annealed Coating exhibits the excellent Self-Lubricating behavior with friction coefficients below 0.3 from 25 to 1000 °C. Friction coefficients show no evident change even in five thermal cycles, showing a great potential as Self-Lubricating Coating operated in a wide temperature range. While the mesh-like heave structure is damaged by friction, Ti and Cr atoms diffusion could continuously supplement the heave structure at the damaged locations at high temperature, enduing the mesh-like heave structure with the self-healing ability.

  • method for plating high temperature self lubricating Coating on metal surface through laser
    2010
    Co-Authors: Baogang Guo, Shitang Zhang, Huidi Zhou, Jiansong Zhou
    Abstract:

    The invention discloses a method for plating high-temperature Self-Lubricating Coating on metal surface through laser. The method adopts nickel coated hexagonal boron nitride as a lubricating phase, adopts a metal alloy as a sticking phase, and adopts the technical route of pre-melting powder with weak standard and preparing the Coating with strong standard to plate the high-temperature Self-Lubricating Coating on metal surface. The plating technique of the invention is stable, and basically has no splashing; boron nitride particles are uniformly distributed in the Coating and basically have no burning loss; and the sticking phase is compact and continuous without defaults. The method for plating high-temperature Self-Lubricating Coating on metal surface through laser can be applied to mechanical rubbing pairs running under high-temperature severe conditions like guide vane of turbine engine, distributing valve holder, etc.

Zhen Li - One of the best experts on this subject based on the ideXlab platform.

  • effect of silver vanadate on the lubricating properties of nicraly laser cladding Coating at elevated temperatures
    Surface & Coatings Technology, 2016
    Co-Authors: Youjun Yu, Jiansong Zhou, Lingqian Wang, Zhen Li
    Abstract:

    Abstract Self-Lubricating Coating NiCrAlY/Cr3C2 (NiCr)/V2O5/Ag2O was prepared by laser cladding. Two different kinds of contrast samples were prepared in order to verify the excellent tribological properties of the composite Coating. The composition and microstructure of the composite Coating were characterized by X-ray diffractometry, scanning electron microscopy with energy spectrum analyzer (SEM-EDS). The tribological behavior of the Coating from 25 °C to 800 °C was evaluated by a ball-on-disk tribometer and dual-mode 3D surface profiler, the corresponding wear mechanism of the composite Coating was investigated by Raman spectroscopy. It has been found that the composite Coating shows better tribological properties than the compared Coatings when the temperature higher than 400 °C, the friction coefficient of composite Coating was 0.143 and the wear rate was 2.86 × 10− 5 mm3/Nm at 800 °C. All these can be attributed to formation of the self-lubricant Ag3VO4 and AgVO3 with lamella structure on the worn surface. The wear mechanism of the composite Coating is dominated by plastic deformation, delamination and adhesive wear at elevated temperature.

Jiansong Zhou - One of the best experts on this subject based on the ideXlab platform.

  • effect of silver vanadate on the lubricating properties of nicraly laser cladding Coating at elevated temperatures
    Surface & Coatings Technology, 2016
    Co-Authors: Youjun Yu, Jiansong Zhou, Lingqian Wang, Zhen Li
    Abstract:

    Abstract Self-Lubricating Coating NiCrAlY/Cr3C2 (NiCr)/V2O5/Ag2O was prepared by laser cladding. Two different kinds of contrast samples were prepared in order to verify the excellent tribological properties of the composite Coating. The composition and microstructure of the composite Coating were characterized by X-ray diffractometry, scanning electron microscopy with energy spectrum analyzer (SEM-EDS). The tribological behavior of the Coating from 25 °C to 800 °C was evaluated by a ball-on-disk tribometer and dual-mode 3D surface profiler, the corresponding wear mechanism of the composite Coating was investigated by Raman spectroscopy. It has been found that the composite Coating shows better tribological properties than the compared Coatings when the temperature higher than 400 °C, the friction coefficient of composite Coating was 0.143 and the wear rate was 2.86 × 10− 5 mm3/Nm at 800 °C. All these can be attributed to formation of the self-lubricant Ag3VO4 and AgVO3 with lamella structure on the worn surface. The wear mechanism of the composite Coating is dominated by plastic deformation, delamination and adhesive wear at elevated temperature.

  • method for plating high temperature self lubricating Coating on metal surface through laser
    2010
    Co-Authors: Baogang Guo, Shitang Zhang, Huidi Zhou, Jiansong Zhou
    Abstract:

    The invention discloses a method for plating high-temperature Self-Lubricating Coating on metal surface through laser. The method adopts nickel coated hexagonal boron nitride as a lubricating phase, adopts a metal alloy as a sticking phase, and adopts the technical route of pre-melting powder with weak standard and preparing the Coating with strong standard to plate the high-temperature Self-Lubricating Coating on metal surface. The plating technique of the invention is stable, and basically has no splashing; boron nitride particles are uniformly distributed in the Coating and basically have no burning loss; and the sticking phase is compact and continuous without defaults. The method for plating high-temperature Self-Lubricating Coating on metal surface through laser can be applied to mechanical rubbing pairs running under high-temperature severe conditions like guide vane of turbine engine, distributing valve holder, etc.