High Temperature Oxidation Behavior of FeCrAl/La2Zr2O7 Composites Prepared by Mechanical Alloying and Spark Plasma Sintering
Composite materials with different Al content Fe-Cr-xAl/La2Zr2O7(x=4,8 and 10,mass fraction,％)were prepared by mechanical alloying and spark plasma sintering technique.Then the oxida-tion behavior of the composite materials in air at 1000℃ is studied via mass change measurement,scan-ning electron microscope(SEM),energy dispersive spectroscope(EDS)and X-ray diffractometer(XRD).The results show that in the initial oxidation stage,the oxidation rate of the composite materials gradually increases with the increase of Al content.However,in the stable oxidation stage,the oxidation rates of the three composite materials are similar to each other.During the oxidation process,the formed oxide scale on the composite containing 4％Al remains as stable α-Al2O3 with slow growth rate.On the compos-ite containing 8％Al,metastable θ-Al2O3 with faster growth rate is generated on the surface while FeAl phase is precipitated in the initial oxidation stage,which accelerates the oxidation.The higher the Al con-tent,the more the FeAl phase precipitated and the obvious higher the oxidation acceleration.With the prolonging oxidation time,θ-Al2O3 gradually transforms into α-Al2O3,and the oxidation behavior of the three composite materials is similar.The results of this study may provide a reliable reference for the de-velopment of the perforated head of long-life and high-reliability for making seamless steel pipes.
FeCrAl/La2Zr2O7 compositesperforated headhigh temperature oxidationoxidation kinetics
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