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石墨含量對(duì)鎳基高溫合金在900 oC氧化行為的影響
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Effect of Graphite Addition on Oxidation Behavior of Ni-Cr-Based Superalloy at 900 oC
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Project Supported by Qing Lan Project of Jiangsu Province

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    摘要:

    采用粉末冶金方法制備不同石墨含量(0 %、3 %、6 %)的鎳基高溫合金，研究合金材料在900 ℃和100 h下的恒溫氧化行為，用掃描電鏡和X射線衍射對(duì)其氧化表面形貌和成分進(jìn)行觀察和分析。結(jié)果表明: 石墨含量較低(0%，3%)時(shí)，鎳基合金氧化動(dòng)力學(xué)符合拋物線規(guī)律，表面氧化膜無(wú)剝落；石墨含量為0%的合金氧化膜由Cr2O3 和NiCr2O4 組成，石墨含量為3%的合金氧化膜由Cr2O3組成，當(dāng)石墨含量增加到6%時(shí)，大量石墨的氧化分解導(dǎo)致合金初始氧化嚴(yán)重，石墨分解后的孔洞加速氧化反應(yīng)過(guò)程。根據(jù)氧化膜的組成分析了

    Abstract:

    Nickel-based alloys with different contents of graphite were prepared by powder metallurgy method. High temperature oxidation resistance of these alloys was studied by high temperature test at 900 ℃ for 100 h in static air. Morphology of oxides was studied by SEM and their composition was analyzed by XRD. The result shows that the kinetic curves of oxidation for nickel-based alloys with lower content of graphite obey the parabolic law. The oxide films consist of Cr2O3 and NiCr2O4 when the alloy contains no graphite. The oxide film consists of Cr2O3 when the alloy contains 3% graphite. If graphite content increases to 6%, the oxidative decomposition of graphite leads to severe initial oxidation, and mass gain takes place significantly; the cavity after decomposition of graphite accelerates the process of oxidation reaction. The oxidation mechanism of the alloy has also been suggested by the phase composition analyses of oxide film

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薛茂權(quán).石墨含量對(duì)鎳基高溫合金在900 oC氧化行為的影響[J].稀有金屬材料與工程,2009,38(7):1146~1149.[Xue Maoquan. Effect of Graphite Addition on Oxidation Behavior of Ni-Cr-Based Superalloy at 900 oC[J]. Rare Metal Materials and Engineering,2009,38(7):1146~1149.]
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  • 收稿日期:2008-06-25
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