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機械合金化Ni-20Cr合金的循環(huán)氧化行為
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遼寧省自然科學基金(20042010);遼寧省高等學校優(yōu)秀人才支持計劃(RC-05-15)及遼寧省教育廳項目(20060683)資助


Cyclic Oxidation Behavior of Ni-20Cr Alloy Prepared by Mechanical Alloying
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    摘要:

    結合XRD、TEM、SEM、OM等表面分析技術,研究機械合金化Ni-20Cr合金在1000 ℃空氣中的循環(huán)氧化行為,并與熔煉合金進行比較。結果表明:200 h循環(huán)氧化后,機械合金化 Ni-20Cr合金表面生成Cr2O3氧化膜,且剝落輕微;而熔煉Ni-20Cr合金表面生成由NiO和NiCr2O4組成的氧化膜,且剝落嚴重,其單位面積失重明顯大于機械合金化Ni-20Cr合金。在實驗條件下,機械合金化Ni-20Cr合金較熔煉Ni-20Cr合金具有更好地抗循環(huán)氧化性能。一方面,晶粒細化促進保護性Cr2O3膜的生成;

    Abstract:

    XRD, TEM, SEM and OM techniques are used to investigate the cyclic oxidation behavior of Ni-20Cr alloys prepared by mechanical alloying (MA ) and conventional casting (CA ) at 1000 ℃ in air. It is found that a compact Cr2O3 scale is formed with a very good adhesion for the mechanically alloying Ni-20Cr alloy, even after a cyclic oxidation at 1000 ℃for 200 h, but a slight scale spallation is observed. For the conventional casting Ni-20Cr alloy, a complex scale of NiO/NiCr2O4 is formed, and a severe scale spallation is observed with a obvious mass decrease after a cyclic oxidation at 1000 ℃ for 200 h. The results show that the MA Ni-20Cr alloy exhibits a better cyclic oxidation resistance than the CA Ni-20Cr alloy owing to the fact that the grain refinement can significantly promote the formation of Cr2O3 scale and enhance the adhesion to the scale by the thermal stress reduction and release

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付廣艷,劉 群,蘇 勇,蔡 璐.機械合金化Ni-20Cr合金的循環(huán)氧化行為[J].稀有金屬材料與工程,2009,38(7):1150~1153.[Fu Guangyan, Liu Qun, Su Yong, Cai Lu. Cyclic Oxidation Behavior of Ni-20Cr Alloy Prepared by Mechanical Alloying[J]. Rare Metal Materials and Engineering,2009,38(7):1150~1153.]
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  • 收稿日期:2008-06-24
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