Properties of TiN-matrix coating deposited by reactive HVOF spraying

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Abstract

TiN-matrix coating was prepared by reactive high velocity oxygen fuel (HVOF) spraying on carbon steel based on the self-propagating high temperature synthesis (SHS) technique in air. The phase composition, structures, and properties of TiN-matrix coating were analyzed using XRD, EDS, SEM and Vickers microhardness equipment. The anti-corrosion property in nearly neutral 3.5 wt% NaCl electrolytic solution was measured. The Weibull distribution of Vickers microhardness at different loads and their linear fitting were analyzed. The apparent fracture toughness of the coating was also calculated. The coating is composed of main phases (TiN, TiN0.3), minor phases (Ti2O3, TiO2), and porosity. The anti-corrosion property of an HVOF-sprayed TiN-matrix coating in electrolytic solution is superior to that of AISI 316L stainless steel. The microhardness values from 1137HV0.05 to 825HV1 are relatively high and have indentation size effect (ISE). With the increment of m, which increases with the increment of applied load, the microhardness values are more concentrated. The average value of apparent fracture toughness K IC is \( 4.62\,\hbox{MPa} \cdot m^{{\frac{1} {2}}} \). It is higher than that of reactive plasma sprayed (RPS) TiN coating, which reflects the good toughness of a TiN-matrix coating deposited by reactive HVOF spraying.

Keywords

Reactive high velocity oxygen fuel (HVOF) spraying TiN-matrix coating Vickers microhardness Weibull distribution Apparent fracture toughness Polarization curve 
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Notes

Acknowledgments

The authors are grateful to Mr. W. Tang for the depositing of the coating and the XRD analysis by Mr. H. B. Han in the instrumental analysis center of Shanghai Jiaotong University. This work was financially supported by the Opening Fund Program of China (No. KFJJ07-2). The authors are also thankful for the hard work of editors and reviewers on the paper.

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Copyright information

© FSCT and OCCA 2008

Authors and Affiliations

  1. 1.State Key Laboratory of Metal Matrix CompositesShanghai Jiaotong UniversityShanghaiPeople’s Republic of China
  2. 2.State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijingPeople’s Republic of China
  3. 3.Material InstituteHebei University of Science and TechnologyShijiazhuangPeople’s Republic of China

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