Results of Long-Term Stability Tests Performed for the Eutectics Co鈥揅 and Pt鈥揅

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• 作者：T. Wang (1) wangtj@nim.ac.cn
  C. Bai (1)
  W. Dong (1)
  Z. Yuan (1)
  P. Bloembergen (1)
  F. Liu (2)
• 关键词：Metal&#8211 ; carbon eutectics &#8211 ; Metrology &#8211 ; Radiation thermometry &#8211 ; Stability &#8211 ; Temperature standards
• 刊名：International Journal of Thermophysics
• 出版时间：August 2011
• 出版年：2011
• 期刊代码：33_0195928X
• 类别：ch
• 卷：32
• 期：7-8
• 页码：1719-1731
• 数据来源：sp

摘要

The stability of the Co–C and Pt–C eutectic fixed points is investigated in this article. Six cells were employed for the testing. Two existing cells, a Co–C cell with a C/C sheet incorporated and a Pt–C cell equipped with a graphite sleeve that had been previously aged, were studied to determine the presence of anomalous drifts or degrading robustness that may possibly appear when the testing period is extended. The stability of four cells of a new design, a Co–C cell and three Pt–C cells, which were constructed in a hybrid manner, to include a sleeve, foil lining, and two of them with a cavity support, were likewise tested. Results show that different designs of Pt–C cells can exhibit good stability. However, for Co–C cells, the cavity rift remains a problem. The possible reasons for this rift and methods for increasing cell life are discussed.