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首页> 外文期刊>Optics and Lasers in Engineering >Examination of temperature distribution and the thermal effects on Si_3N_4 engineering ceramics during fibre laser surface treatment
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Examination of temperature distribution and the thermal effects on Si_3N_4 engineering ceramics during fibre laser surface treatment

机译：光纤激光表面处理过程中温度分布及其对Si_3N_4工程陶瓷的热效应的检查

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摘要

The thermal effects of fibre laser surface treatment on a Si_3N_4 engineering ceramic were studied using a computational finite element analysis (FEA). Temperature increases on the surface of the Si_3N_4 during fibre laser processing were measured using an infra-red thermometer; temperature distributions in the bulk were measured with specifically located thermocouples. A computational model by using FEA was then developed to model the flow and the distribution of the radiated heat resulting from the fibre laser treatment of the Si_3N_4 ceramic. By utilising data obtained from a TG-DSC analysis the FEA model predictions of the temperature distribution were used to map phase transformations and significant events occurring during the fibre laser surface treatment of the Si_3N_4. The TG-DSC analysis also indicated that the fibre laser surface treatment generally resulted in a phase transformation of the Si_3N_4 from α-phase to β-phase modification as elongated rod-like grains were found.
机译：使用计算有限元分析（FEA）研究了光纤激光表面处理对Si_3N_4工程陶瓷的热效应。使用红外测温仪测量光纤激光加工过程中Si_3N_4表面的温度升高；使用特定位置的热电偶测量大块中的温度分布。然后开发了一个使用FEA的计算模型，以对通过Si_3N_4陶瓷的纤维激光处理产生的辐射热的流动和分布进行建模。通过利用从TG-DSC分析获得的数据，将温度分布的FEA模型预测用于映射相变和Si_3N_4的光纤激光表面处理期间发生的重要事件。 TG-DSC分析还表明，光纤激光表面处理通常导致Si_3N_4的相变从α相转变为β相，因为发现了细长的棒状晶粒。

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