Journal of Materials Science

, Volume 44, Issue 1, pp 227–233 | Cite as

Fabrication and properties of a lubrication composite coating based on poly(p-hydroxybenzoic acid) (PHBA)

  • Wang JianEmail author
  • Zhao Wenzhen
  • Guo Chaowei


The present paper describes an approach for fabricating smooth, compact and homogeneous composite coatings of PHBA/PA/MoS2 on test blocks. The tribological behaviors were tested on a ring-block machine. For the PHBA/PA 6,6/MoS2 coating of 20 wt.% PA 6,6 and 30 wt.% MoS2 with the thickness of 20–40 μm, the steady friction coefficient was approximately 0.04 with the lowest wear loss while sliding against AISI 1045 steel ring. The PHBA in coating was synthesized in situ at 200 °C for the first step and 260 °C for the second. The chemical structures and thermal properties of the obtained PHBA were characterized by means of Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry/thermogravimetry (DSC/TG). The results showed that the chemical structure of the obtained PHBA was identical to that of the commercial PHBA powder despite that the decomposition temperature and the crystal transition temperature of the former were approximately 10–20 °C lower than that of the latter. The influence of nominal pressure and sliding velocity on the friction coefficient (μ) and wear volume loss of the coatings was investigated. The results displayed that μ increased with the increase of sliding velocity, while it decreased when the nominal pressure was increased. For the volume loss, it increased with both the increase of speed and pressure.


Friction Coefficient MoS2 Composite Coating Test Block Nematic Phase 



Poly(p-hydroxybenzoic acid)


Decomposition temperature


Crystal transition temperature


Melting temperature


Optical microscope

PA 6,6

Polyamide 6,6


p-acetoxybenzoic acid


p-hydroxybenzoic acid




Fourier transform infrared spectroscopy


Glass transition temperature


Differential scanning calorimetry


Thermogravity analysis

\( \bar{D}_{\text{p}} \)

Mean polymerization degree

\( \bar{M}_{\text{w}} \)

Mean relative molecular weight


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.State Key Laboratory for Mechanical Behavior of Materials, School of Material Science and EngineeringXi’an Jiaotong UniversityXi’anChina
  2. 2.School of Chemistry & Chemical EngineeringYangzhou UniversityYangzhouChina

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