Deguo Wang

By Yanbao Guo and Deguo Wang

This review introduced the preparation and structural characterization of polyelectrolyte multilayers in recent years and also summarized the tribology research progress of the polyelectrolyte multilayers, including tribological properties, surface adhesion characteristics, and wear resistance properties. Statistics analysis indicated that nanoparticles‐doped polyelectrolyte multilayers present better friction and wear performance than pristine polyelectrolyte multilayers. Furthermore, the in situ growth method resulted in improved structural order of nanoparticles composite molecular deposition film. In situ nanoparticles not only reduced the molecular deposition film surface adhesion force and friction force but also significantly improved the life of wear resistance. That was due to the nanoparticles that possessed a good load‐carrying capacity and reduced the mobility of the polymer‐chain segments, which can undergo reversible shear deformation. Based on this, further research direction of in situ nanoparticles molecular deposition film was proposed.

Part of the book: Nanoscaled Films and Layers

By Kai Zhang, Zhenquan Wang and Deguo Wang

Among anti-wear technologies, hardbanding is the most effective measure to reduce the wear of drill pipe and casing. Many new hardbanding materials are introduced constantly, and the varieties of hardbandings are becoming more and more abundant. In this paper, the research history and status quo of the hardbanding materials in tool joint are reviewed. And the advantages and disadvantages of all kinds of wear-resisting materials are introduced. Finally, the development orientation in hardbanding materials in drill joint was pointed out.

Part of the book: Strength of Materials