Carbide particle growth observed in a NbC-12%Ni (mass percent) sample sintered at 1420 °C was discussed using DICTRA® simulation of spherical particles immersed in a Ni matrix. It is possible to describe the liquid formation during sintering using a model that assumes a spherical region of NbC, with radius equivalent to the NbC particle distribution, surrounded by nickel. NbC volume fraction was obtained for different simulation times allowing the evaluation of the dissolution behavior in different particle sizes. Small carbides (around 1 μm in diameter) suffered total dissolution, while major carbides (10 μm in diameter) did not dissolve during the simulation. Chemical content evidenced that Nb and C from carbide dissolution segregated to liquid phase reaching levels up to 15 and 2%, respectively, showing the availability of this elements to re-precipitate in non-dissolved carbides during cooling from sintering temperature. The simulations indicate that carbide particle growth observed in NbC-12%Ni sintered sample can be a result of dissolution and re-precipitation mechanism.

使用浸入Ni基体中的球形颗粒的DICTRA®模拟，讨论了在1420°C烧结的NbC-12％Ni（质量百分比）样品中观察到的碳化物颗粒生长。可以使用一个模型来描述烧结过程中的液体形成过程，该模型假设一个球形的NbC球形区域，其半径等于NbC颗粒分布，并被镍包围。在不同的模拟时间获得了NbC体积分数，从而可以评估不同粒径下的溶解行为。在模拟过程中，小的碳化物（直径约1μm）完全溶解，而主要的碳化物（直径10μm）不溶解。化学含量表明，碳化物溶解产生的Nb和C分离到液相，分别达到15％和2％的水平，显示了从烧结温度冷却期间这些元素可在非溶解碳化物中重新沉淀的可用性。模拟表明，NbC-12％Ni烧结样品中观察到的碳化物颗粒生长可能是溶解和再沉淀机理的结果。