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中国腐蚀与防护学报  2001, Vol. 21 Issue (5): 257-264     
  研究报告 本期目录 | 过刊浏览 |
纳米晶Ni-Ag合金在600-700℃的空气氧化
赵泽良;牛 焱;F.Gesmundo
中科院金属所(南区)
OXIDATION BEHAVIOR OF NANOCRYSTALLINENi-Ag ALLOYS AT 600-700℃ IN AIR
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中科院金属所(南区)
全文: PDF(310 KB)  
摘要: 利用球磨和热压致密化过程,得到富Ag和富Ni相均匀分布的 纳 米晶Ni-Ag双相合金.研究了含Ni分别为50 at%和75 at%的Ni-50Ag和Ni-25Ag合金在600~70 0℃空气中的氧化.Ni-50Ag合金形成了Ni内氧化结构,最外层为连续Ag层,其氧化速率 大于纯Ni.相反,Ni-25Ag合金则形成了连续的NiO外氧化层且最外层为不连续的Ag层.Ni-25A g合金氧化初期服从抛物线速率常数关系,随后氧化速率显著减小甚至小于纯Ni.合金的双相 结构特性以及合金中极小的晶粒尺寸导致了上述结果的产生.
关键词 Ni-Ag机械合金化纳米晶氧化双相合金    
Abstract:Two Ni-Ag alloys, containing Ni of 50 at% and 75 at %, denoted as Ni-50Ag and Ni-25Ag were consolidated with hot pressing (HP) proce ssing after mechanical alloying (MA) for 80 hr. The nanocrystalline alloys have been oxidized in air at 600-700 ℃ for 24 hr.Ni-50Ag alloy undergoes an inte rna l oxidation of nickel associated with the formation of a continuous outermost la yer of silver metal and has oxidation rates larger than those of pure nickel. On the contrary, Ni-25Ag alloy forms a continuous NiO layer surmounted by a discon tinuous silver layer, while the internal oxidation is suppressed. These results are interpreted on the basis of the two-phase nature of the alloys and of their particularly small grain size.
Key wordsmechanical alloying    two-phase alloy    Ni-Ag    nanocryst alline    oxidation
收稿日期: 2000-07-05     
ZTFLH:  TG146.15  
通讯作者: 赵泽良   

引用本文:

赵泽良; 牛焱; F.Gesmundo . 纳米晶Ni-Ag合金在600-700℃的空气氧化[J]. 中国腐蚀与防护学报, 2001, 21(5): 257-264 .

链接本文:

https://www.jcscp.org/CN/Y2001/V21/I5/257

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