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首页> 外文期刊>Journal of Manufacturing Processes >Impact of convection and radiation on direct/hybrid heating stability of field assisted sintering
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Impact of convection and radiation on direct/hybrid heating stability of field assisted sintering

机译：对流与辐射对现场辅助烧结直接/混合加热稳定性的影响

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摘要

Field assisted sintering (FAST) processes allow a direct transmission of the heating energy to the specimen (through the electric, magnetic fields or the electrical current). FAST allows higher heating rates, faster sintering response and a better control of the sintered microstructures. However, FAST suffers high heating instability in direct heating configurations which generally takes the form of a hot spot. The origin of these hot spots is well known and is correlated to the convective/radiative cooling at the specimen surfaces and the thermal dissipation in the specimen. Nevertheless, the impact of these cooling fluxes evolves with the sample dimensions, thermal insulation, heating rate and hybrid heating conditions and there is not clear quantification of the relative importance of these fluxes in regards to the previous cited heating conditions. In this work we develop a finite element (FE) tool which can easily explore the heating stability of an "Equivalent Thermal Cavity" (ETC). We illustrate the ETC concept by the case study of the microwave sintering of zirconia. We show that the dominant heat transfer is radiative, but the convective fluxes have a high importance for the temperatures homogenization, in particular in the case of a hybrid heating configuration.
机译：现场辅助烧结（快速）工艺允许将加热能量直接传递给样品（通过电气，磁场或电流）。快速允许更高的加热速率，更快的烧结响应和更好地控制烧结微观结构。然而，在直接加热配置中快速遭受高加热不稳定，这通常采用热点的形式。这些热点的起源是众所周知的，与样品表面的对流/辐射冷却以及样品中的热耗散相关。然而，这些冷却通量的影响随着样品尺寸，绝热，加热速率和混合加热条件的影响，并且没有明确定量这些通量对先前引用的加热条件的相对重要性。在这项工作中，我们开发了一个有限元（Fe）工具，可以容易地探索“等效热腔”（ETC）的加热稳定性。我们通过氧化锆微波烧结的情况说明了ETC概念。我们表明主导的传热是辐射的，但对流助熔剂对温度均匀化具有很高的重要性，特别是在混合加热配置的情况下。

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