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OALib Journal期刊
ISSN: 2333-9721
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la对ni--cr--w--mo耐热合金1173k恒温氧化行为的影响
Keywords: 金属材料,ni--cr--w--mo耐热合金,稀土元素la,恒温氧化,固溶la
Abstract:
？研究了不同la含量ni--cr--w--mo耐热合金的1173k恒温氧化行为.结果表明:la能明显提高合金的抗氧化能力.不同la含量合金的抗氧化性能从劣到优依次为:la含量为0%、0.048%、0.026%、0.087%.添加超过0.026\%的合金由于析出la化合物,使la的固溶量未呈线性增加,而在0.048%处出现拐点.氧化中由于la化物不参与氧化,因此合金的抗氧化能力主要取决于la在合金中的实际固溶量,固溶的la形成lacro3是la提高合金抗氧化能力的主要原因.lacro3在氧化物晶界处的偏聚阻碍了cr3+的扩散,并可作为mncr2o4异制形核的核心,促进细小的mncr2o4生成并弥散分布于cr2o3之间,形成混合氧化膜,提高了氧化膜的粘附性,亦成为提高抗氧化能力的因素.
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