Microstructure and high-temperature corrosion behavior of a Cr-Al-C composite
Microstructure and high-temperature corrosion behavior of a Cr-Al-C composite
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DOI：
10.1111/j.1551-2916.2007.02059.x
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发表时间：
2007-12-01
影响因子：
3.9
通讯作者：
Zhou, Yanchun
中科院分区：
文献类型：
--
作者：
Lin, Zhijun;Li, Meishuan;Zhou, Yanchun
A Cr-Al-C composite was successfully synthesized by a hot-pressing method using Cr, Al, and graphite as starting materials. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy analyses revealed that the composite contained Cr2AlC, AlCr2, Al8Cr5, and Cr7C3. The orientation relationships and atomic-scale interfacial microstructures among Cr2AlC, AlCr2, and Al8Cr5 are presented. This composite displays both excellent high-temperature oxidation resistance in air and hot-corrosion resistance against molten Na2SO4 salt. The parabolic rate constants for the oxidation in air at 1000 degrees, 1100 degrees, and 1200 degrees C are 3.0 x 10(-12), 6.2 x 10(-11), and 6.2 x 10(-10) kg(2) (m(4).s)(-1), respectively, while the linear weight gain rates for the hot corrosion of Na2SO4-coated samples at 900 degrees and 1000 degrees C are, respectively, 1.2 x 10(-3) and 4.4 x 10(-3) mg (cm(2).h)(-1). The mechanism of the excellent high-temperature corrosion resistance can be attributed to the formation of a protectively alumina-rich scale.
