Effect of the number of SiO2 film coating layers on the high temperature oxidation resistance of 304 stainless steel
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School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang

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TG174.32

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    Abstract:

    In order to improve the oxidation resistance of 304 stainless steel, SiO2 thin films were prepared on the stainless steel surface by sol–gel method using tetraethyl orthosilicate (TEOS) as raw material. The effect of coating number on the high-temperature oxidation resistance of stainless steel at 900℃ was studied. X-ray diffractometer (XRD), oxidation kinetics, and scanning electron microscope (SEM) analysis results show that the SiO2 film effectively reduces the oxygen partial pressure at the interface between the substrate and the film, and promotes the selective oxidation of the stainless steel surface to produce Cr2O3 and NiCr2O4 with good high temperature resistance. Furthermore, the high temperature oxidation resistance of stainless steel is significantly improved. The sample coated with three layers of SiO2 film has the best high temperature oxidation resistance. Too many coating layers increase the internal stress of the film, which will cause cracks and peeling of the film to reduce the high temperature oxidation resistance of stainless steel.

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History
  • Received:September 06,2020
  • Revised:September 06,2020
  • Adopted:April 26,2022
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