Characterization of Oxidation Kinetics of Mo–Si–B-Based Materials
Characterization of Oxidation Kinetics of Mo–Si–B-Based Materials
复制标题
DOI：
10.1007/s11085-016-9659-3
复制
发表时间：
2017-02
影响因子：
2.2
通讯作者：
M. Azim;B. Gorr;H. Christ;M. Heilmaier;U. Koch;M. Engelhard
中科院分区：
文献类型：
--
作者：
M. Azim;B. Gorr;H. Christ;M. Heilmaier;U. Koch;M. Engelhard
基于难熔金属（如Mo）的复合材料的氧化动力学的表征通常是非常复杂的，因为挥发性氧化物和稳定氧化物同时形成。具体而言，热重测量的比质量变化代表相反质量变化过程的总和：（i）由于挥发性氧化物物质的形成而导致的质量损失和（ii）由于固体粘附氧化物层的生长而导致的氧吸收而导致的质量增加。为了明确评估这种合金的抗氧化性，需要将这两个相反的过程分开并对其进行定量描述。在这项研究中，提出了一种新的方法，使氧化过程中使用测得的氧化层厚度的材料的量的影响确定。该方法还允许将热重数据定量分离为质量损失（氧化物蒸发）和质量增加（氧摄取）。以Mo-9 Si-8B多相材料为例，讨论了将热重曲线分为质量增加和质量损失两部分的优点。
Characterization of oxidation kinetics of composites based on refractory metals like Mo by means of thermogravimetry is often very complex, because of the simultaneous formation of both volatile and stable oxides. Specifically, thermogravimetrically measured specific mass changes represent the sum of opposite mass change processes: (i) mass loss due to the formation of volatile oxide species and (ii) mass gain as a result of oxygen uptake due to the growth of solid, adherent oxide layers. In order to unambiguously assess the oxidation resistance of such alloys, a separation of these two opposing processes and their quantitative description are needed. In this study, a novel approach is proposed that enables determination of the amount of the material affected during oxidation using the measured oxide layer thickness. This approach also permits a quantitative separation of thermogravimetric data into mass loss (oxide evaporation) and mass gain (oxygen uptake). The advantage of splitting of the thermogravimetric curve into mass gain and mass loss is discussed on the basis of the multiphase material Mo–9Si–8B.