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首页> 外文学位 >Modeling of the reaction-based processing of aluminum oxide (RBAO) and alumina-aluminide alloys (3A).
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Modeling of the reaction-based processing of aluminum oxide (RBAO) and alumina-aluminide alloys (3A).

机译：对氧化铝（RBAO）和氧化铝-铝化物合金（3​​A）的基于反应的处理进行建模。

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Transient material and energy balances have been utilized to model the reaction-bonded aluminum oxide (RBAO) and alumina-aluminide alloys (3A) processes. The model for the RBAO process considers the diffusion of a gas-phase reactant into a porous solid followed by a solid-gas reaction, while the 3A model considers a solid-solid reaction taking place within a porous solid. The modeling work on the RBAO process reveals that the process may proceed via an ignition/extinguishment phenomenon with thermal runaway. It is believed that this type of behavior can lead to stress development, and subsequent sample cracking. Thus, the model is used to determine conditions under which RBAO bodies may be fired in a controlled manner (i.e., avoiding the runaway reaction). A complimentary experimental study, utilizing simultaneous thermogravimetry (TG) and differential thermal analysis (DTA), in-situ temperature measurements, and analysis of samples fired in a box furnace, verifies the predicted reaction behavior and shows that by controlling the reaction, high Al content powders can be used to produce crack-free RBAO samples. The modeling work on the 3A process demonstrates the effects of various processing parameters on the general reaction behavior. After considering the general behavior, the model is used to predict the reaction behavior of the {dollar}TiOsb2/Al{dollar} system. A reaction sequence for the {dollar}TiOsb2/Al{dollar} system (based on XRD data) is proposed and used to model the system. The effects of the heating rate, the convective heat transfer coefficient, and sample size are investigated.
机译：瞬态材料和能量平衡已用于模拟反应结合的氧化铝（RBAO）和氧化铝-铝合金（3A）的过程。 RBAO过程的模型考虑了气相反应物向多孔固体中的扩散，然后发生固-气反应，而3A模型考虑了在多孔固体中发生的固-固反应。 RBAO过程的建模工作表明，该过程可能会通过带有热失控的着火/熄灭现象进行。据信，这种行为可导致应力发展和随后的样品破裂。因此，该模型被用于确定可以以受控方式（即，避免失控反应）发射RBAO物体的条件。一项免费的实验研究，利用同时热重分析（TG）和差热分析（​​DTA），原位温度测量以及在箱式炉中燃烧的样品分析，验证了预测的反应行为，并表明通过控制反应，高铝含量高的粉末可用于生产无裂纹的RBAO样品。 3A过程的建模工作证明了各种工艺参数对一般反应行为的影响。在考虑了一般行为之后，该模型被用于预测{TiO 2} / TiO 3 / Al体系的反应行为。提出了美元的TiOsb2 / Al {美元}体系的反应序列（基于XRD数据），并将其用于系统建模。研究了加热速率，对流传热系数和样本量的影响。

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