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Dissolution behavior of TiN in liquid cobalt
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2020-04-27 , DOI: 10.1016/j.ijrmhm.2020.105271
Ming Zhong , Yining He , Petrus C. Pistorius , Bryan A. Webler

A confocal scanning laser microscope (CSLM) with a hot stage was used to study the dissolution of TiN in liquid cobalt under different gas atmospheres. The dissolution of cubic carbonitrides in cobalt is a key step in the formation of the cobalt enriched zone (CEZ) during cemented carbide production. A model system of cobalt + TiN was used in this work and in-situ observations were made at 1500 °C and 1550 °C in 5%H2-Ar and 5%H2-N2. Dissolution was observed in 5%H2-Ar but not 5%H2-N2. At 1550 °C in 5%H2-Ar, gas bubbles were observed in the liquid cobalt and rapid dissolution was observed. The dissolution rate of TiN was quantified at 1500 °C in 5%H2-Ar. The rate-controlling step of TiN dissolution was hypothesized to be mass transfer of nitrogen in the liquid cobalt to the liquid/gas interface. This was tested by using the shrinking core model to calculate the diffusivity of nitrogen based on the measured dissolution rates. The diffusivity was between 6.4 × 10−5 cm2/s and 5.3 × 10−4 cm2/s, which was consistent with a previous study (approximately 1 × 10−4 cm2/s). The findings of this work can be utilized in detailed models of CEZ formation during cemented carbide production.



中文翻译:

TiN在液态钴中的溶解行为

共焦扫描激光显微镜(CSLM)具有热台用来研究TiN在不同气体气氛下在液态钴中的溶解。立方碳氮化物在钴中的溶解是硬质合金生产过程中钴富集区(CEZ)形成的关键步骤。在这项工作中使用了钴+ TiN的模型系统,并在5%H 2 -Ar和5%H 2 -N 2中于1500°C和1550°C下进行了现场观察。在5%H 2 -Ar中观察到溶解,但在5%H 2 -N 2中观察不到。在1550°C在5%H 2中-Ar,在液态钴中观察到气泡并且观察到快速溶解。TiN的溶解速率在1500°C的5%H 2 -Ar中进行定量。假设TiN溶解的速率控制步骤是液钴中氮向液/气界面的传质。这是通过使用收缩核模型基于测得的溶出速率计算氮的扩散率进行测试的。扩散率为6.4×10 -5  cm 2 / s至5.3×10 -4  cm 2 / s,与先前的研究一致(约1×10 -4  cm 2/ s)。这项工作的发现可用于硬质合金生产过程中CEZ形成的详细模型中。

更新日期:2020-04-27
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