Phase equilibria on Ni-Al interface under low oxygen pressure

Chin Guo Kuo, Wern Dare Jehng, Sheng Jen Hsieh, Chien Chon Chen*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

Seventeen phases of the Ni-Al-O system at high temperatures were analyzed using thermodynamic calculations. An Ni-Al-O isothermal stability diagram was obtained from the thermochemical data. The diagram describes the interface equations for Ni/Al intermetallic compounds, Al/Al2O3, and Al2O3/AlXNiY compounds, and their corresponding regions. Four univariant equilibria points and ten bivariant equilibria lines below 1126 K were obtained. The equations for the coexistence points and interface lines were also obtained. A three-domain diagram of Ni-Al-O phase arrangement at temperatures between 900 and 1191 K is shown. Thermodynamic calculations confirmed that the formation of nickel aluminate spinel (NiAl2O4) requires a threshold NiO activity (log aNiO = -205.3/T - 0.347) and the partial pressure of oxygen (log PO2 = - 24622 / T + 8 atm) . In the Ni-Al-O system, aNiO < 0.266 at 900 K, the compounds in the Ni/Al interface are formed in the order Al3Ni(s) → Al3Ni2(s) → AlNi(s) → AlNi3(s) → Al2O3(α). When aNiO < 0.351 at 1911 K, the compounds in the Ni/Al interface are formed in the order AlNi(s) → Al2O3(α).

原文英語
頁(從 - 到)299-305
頁數7
期刊Journal of Alloys and Compounds
480
發行號2
DOIs
出版狀態已發佈 - 2009 七月 8

ASJC Scopus subject areas

  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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