HIGH-TEMPERATURE OXIDATION PROPERTIES OF THEFe20Cr45Al MICROCRYSTALLINE COATING ANDTHE COATING WITH DISPERSED Y2O3 OXIDE PARTI CLES

J Chin Soc Corr Pro

2002, Vol. 22

Issue (2): 72-78 DOI:

Research Report

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HIGH-TEMPERATURE OXIDATION PROPERTIES OF THEFe20Cr45Al MICROCRYSTALLINE COATING ANDTHE COATING WITH DISPERSED Y2O3 OXIDE PARTI CLES

Huibin Qi;Hongmei Pang;Yedong He;Deren Wang

北京科技大学腐蚀与防护中心〓北京市腐蚀、磨蚀与表面技术重点实验室

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Abstract A Fe20Cr45Al microcrystalline coating an d a Fe20Cr45Al-Y2O3 oxide dispersed microcystalline coating have been prep ared on the Fe20Cr45Al alloy by high frequency electro-spark deposition techni que with home-made equipement.Isothermal oxidation tests of the coated and uncoa ted specimens at 1000℃ and 1100℃ in air were carried out for 200h.The results show that the microcrystalline coatings with Y2O3 dispersed oxide particles el iminated the wrinkles emerged on the Al2O3 oxide scale completely,reduced th e oxide grain size,improved the spalling resistance and enhanced the compactness and the adhesion of oxide scales significantly.In the case of specimens with th e single microcrystalline coating,the wrinkles on oxide scales were only eliminat ed partly and oxide scales were composed of mixtures of wrinkled oxides and micr ocrystallized oxides.The effect of the coatings on oxidation kinetics relied on temperature,or the growing rate of oxide scales.At 1000℃ the weight-gain of all coated specimens reduced;while at 1100℃ the effects of both coatings on oxidat ion kinetics were trivial.It was proved that the microcrystalline structure and the dispersed Y2O3 oxide particles in the coatings have synergetic effects o n improving the protection of Al2O3 oxide scales.

Key words: high frequency electro-spark deposition microc rystalline coating and microcrystalline coating with

Received: 03 December 2001

ZTFLH:

TG172.82

Corresponding Authors: Hongmei Pang

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Huibin Qi; Hongmei Pang; Yedong He; Deren Wang. HIGH-TEMPERATURE OXIDATION PROPERTIES OF THEFe20Cr45Al MICROCRYSTALLINE COATING ANDTHE COATING WITH DISPERSED Y2O3 OXIDE PARTI CLES. J Chin Soc Corr Pro, 2002, 22(2): 72-78 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I2/72

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