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首页> 外文期刊>Journal of Materials Science >Effect of the La2O3 sol–gel coating on the alumina scale adherence on a model Fe–20Cr–5Al alloy at 1100 °C
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Effect of the La2O3 sol–gel coating on the alumina scale adherence on a model Fe–20Cr–5Al alloy at 1100 °C

机译:La 2 O 3 溶胶-凝胶涂层在1100°C下对模型Fe-20Cr-5Al合金氧化铝垢附着力的影响

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摘要

The effect of lanthanum sol–gel coatings was studied in order to improve the alumina scale adherence during the model Fe–20Cr–5Al alloy oxidation, at 1100 °C, in air. Various sol–gel coating procedures were applied. Argon annealing of the lanthanum sol–gel coating was tested at temperatures ranging between 600 and 1000 °C. The coating crystallographic nature was characterized by X-ray diffraction (XRD) depending on the annealing temperature. The oxidation process has been examined at 1100 °C by in situ XRD on blank Fe–20Cr–5Al, sol–gel coated and argon-annealed specimens. This study shows that the coating argon annealing at 1000 °C leads to the preferential formation of LaAlO3 instead of La2O3. This coating procedure leads to an alumina scale formation showing the best adherence under thermal cycling conditions at 1100 °C.
机译:为了提高模型Fe-20Cr-5Al合金在1100°C的空气中氧化过程中对氧化铝鳞片的附着力,研究了镧溶胶-凝胶涂层的作用。应用了各种溶胶-凝胶涂布程序。镧溶胶-凝胶涂层的氩退火在600至1000°C的温度范围内进行了测试。取决于退火温度,通过X射线衍射(XRD)表征涂层的晶体学性质。已经在空白的Fe-20Cr-5Al,溶胶-凝胶涂层和氩气退火的样品上通过原位XRD在1100°C下检查了氧化过程。这项研究表明,在1000°C的条件下进行涂层氩气退火会优先形成LaAlO 3 而不是La 2 O 3 。该涂覆过程导致形成氧化铝垢,在1100℃的热循环条件下显示出最佳的粘附性。

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