THERMODYNAMIC STABILITY OF IRON NITRIDES AT TEMPERATURES BELOW 350-DEGREES-C
THERMODYNAMIC STABILITY OF IRON NITRIDES AT TEMPERATURES BELOW 350-DEGREES-C
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DOI：
10.1103/physrevlett.72.3835
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发表时间：
1994-06-13
影响因子：
8.6
通讯作者：
SARIS, FW
中科院分区：
文献类型：
--
作者：
DEWIT, L;WEBER, T;SARIS, FW
尽管氮化铁涂层因其良好的摩擦学性能而被应用，但其在使用温度范围内的热力学稳定性尚不清楚。我们通过离子注入研究了 0 到 350 摄氏度之间的 s 和 γ' 氮化物相，并发现证据表明，虽然 (1 - x) 大于或等于 2/3 的 epsilon-Fe2N1-x 是稳定的，但 γ'-Fe4N 却不稳定。在 T 小于或等于 150 摄氏度时，离子辐照将 γ'-Fe4N 转化为 epsilon-Fe2N1-x，其中 x -0.5。然后，通过在 150 摄氏度或更高的温度下退火，这种 ε 氮化物可以转变回 γ'-Fe4N。离子照射也有助于这一过程。
Although iron nitride coatings are applied for their good tribological properties, their thermodynamic stabilities are unknown in the temperature range in which they are used. We have investigated the s and gamma' nitride phases between 0 and 350-degrees-C with ion implantation and find evidence that while the epsilon-Fe2N1-x with (1 - x) greater-than-or-equal-to 2/3 is stable, gamma'-Fe4N is not. At T less-than-or-equal-to 150-degrees-C, ion irradiation converts gamma'-Fe4N into epsilon-Fe2N1-x, with x -0.5. This epsilon nitride can then be transformed back into gamma'-Fe4N by annealing at temperatures of 150-degrees-C and higher. Ion irradiation assists this process as well.