TaC/Ni 复合材料的氧化机制

Yuanyang Zhu, Qian Qi, Lujie Wang, Yueyang Zhao, Kaiyue Zheng
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摘要

本文以 Ta、Ni 和石墨为原料,采用反应烧结法制备了原位 TaC/Ni 复合材料,并通过静态循环氧化法研究了它们在 873、973 和 1073 K 空气中的氧化行为。结果表明,复合材料的氧化行为符合线性动力学规律。在 873 K 时,TaC 和 Ni-Ta 基体氧化生成 NiO、Ta2O5、TaO2 和 NiTa2O6。由于镍离子通过 Ta2O5 中的氧化离子空位进行扩散,氧化尺度由双层连续层组成,包括外层 NiO 和内层 Ta2O5。氧气沿着 TaC 和 Ni-Ta 基质之间的界面向内扩散,然后溶解在 TaC 中,取代 C 位生成 Ta 氧化物。973 K 时,由于 Ta 离子加速扩散,更多的 Ta 氧化物占据了氧化鳞片,形成了 NiO 和 Ta 氧化物的交替分布。在 1073 K 时,氧化鳞片主要由 NiTa2O6 占据,并含有少量 NiO。Ta2O5 和 NiTa2O6 的形成反应显示出接近 2 的高 Pilling Bedworth 比,从而导致氧化鳞片的膨胀和压应力。复合材料的氧化主要受控于氧气的内向扩散,从而导致表面形成带有气孔和裂纹的非保护性氧化鳞片。提高 TaC/Ni 复合材料抗氧化性的一个有效方法是限制 Ta2O5 和 NiTa2O6 的形成,以抑制氧化鳞片中裂纹的出现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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The Oxidation Mechanism of TaC/Ni Composites

In this paper, the in situ TaC/Ni composites were prepared by reactive sintering method using Ta, Ni and graphite as raw materials, and their oxidation behavior at 873, 973 and 1073 K in air is investigated by static cyclic oxidation method. The results present that the oxidation behavior of composites conforms to the linear kinetic law. At 873 K, the oxidation of TaC and Ni–Ta matrix generate NiO, Ta2O5, TaO2 and NiTa2O6. The oxide scale is consisted by double continuous layers, including the outer NiO and inner Ta2O5 layer, due to the diffusion of Ni ion through the oxide ion vacancies in Ta2O5. The Oxygen inward diffuse along the interface between TaC and Ni–Ta matrix, and then dissolves in TaC and replaces C sites to generate Ta oxides. At 973 K, more Ta oxides occupy the oxide scale, forming the alternative distribution of NiO and Ta oxides, resulted from the accelerated diffusion of Ta ions. At 1073 K, the oxide scale is mainly taken up by NiTa2O6 with slight NiO. The formation reaction of Ta2O5 and NiTa2O6 shows high Pilling Bedworth ratio near to 2, resulting in the expansion and compressive stress in oxide scale. The oxidation of composites is primarily controlled by the inward diffusion of Oxygen, leading the formation of non-protective oxide scale with pores and cracks on surface. One effective method to improve the oxidation resistance of TaC/Ni composites is to restrict the formation of Ta2O5 and NiTa2O6, to inhibit the appearance of cracks in oxide scale.

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