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Microstructure of Oxide Scale

P-SijAION JCPDS 48-1615 p-Si4Al2O2N0 JCPDS 48-1616 p-SijAljOjNj JCPDS36-1333). (Reproduced with permission from Ref. [23] [Pg.114]

For Z2-1000 as well, no obvious oxide crystals could be seen, but its surface looked more porous than the surface of Zl-1000. However, for Z3-1000, the microstructure looked very different from that of Zl-1000 and Z2-1000, and there were visible agglomerates of oxide particles on the surface, and these should be mullite according to the results of XRD. [Pg.115]

After 1200 °C oxidation (see Z-1200), there were large numbers ofwhite needlelike oxides of less than 1 pm in length on the surface of Zl-1200. Combining the EDS analysis and XRD result, we are convinced that the needle-like oxides should be mullite crystals which grew in amorphous Si02. Clearly, no oxide crystals were seen on the surface of Z2-1200, except for large numbers of white spots which should be mullite oxide as same as the needle-like crystals in Zl-1200. However, their size was smaller than that in Zl-1200. For Z3-1200, we can see that the surface of the specimen was oxidized considerably. Combining the element analysis with the result of XRD, we can conclude that the oxide is mullite. [Pg.115]

When the oxidation temperature was increased to 1400 ° C (Z-1400), the needlelike mullite crystals in Zl-1400 grew up to more than about 10 pm in length. In Z2-1400, the mullite showed two kinds of shapes, needle-like crystals and agglomerates. The needle-like crystals were same as those in Zl-1400, and the agglomerates were same as those in Z3-1400. The whole surface of Z3-1400 is covered with the scale consisting of agglomerates of mullite. [Pg.115]


G. D. West, S. Birosca and R. L. Higginson, Phase determination and microstructure of oxide scales formed on steel at high temperature , J. Microscopy 217, 122-129... [Pg.252]


See other pages where Microstructure of Oxide Scale is mentioned: [Pg.113]    [Pg.393]   
See also in sourсe #XX -- [ Pg.113 ]




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