Strength prediction and optimization for microwave sintering of large-dimension lithium hydride ceramics: GA-BP-ANN modeling

• Published in: Nuclear materials and energy Vol. 41; p. 101801
• Main Authors: Yan, Hongzhou, Chen, Huayan, Zhang, Wenyan, Shuai, Maobing, Huang, Bin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2024; Elsevier
• Subjects: GA-BP-ANN; Lithium hydride ceramics; Microwave sintering; Process optimization; Strength prediction; GA-BP-ANN; Microwave sintering; Process optimization; Strength prediction; Lithium hydride ceramics
• ISSN: 2352-1791; 2352-1791
• DOI: 10.1016/j.nme.2024.101801

•Through correlation analysis, we identified the key sintering process factor affecting the strength of LiH during the cooling stage, namely, the duration of sintering cooling control.•By establishing a GA-BP-ANN model and employing the PFAD method, we quantitatively described the efficiency improvement of our proposed bilinear temperature control technique compared to linear temperature control.•The methodology provided in this paper enables the determination of the optimal sintering process parameters for a given sample thickness, ensuring safety while enhancing efficiency, thus aiding in quality improvement and efficiency enhancement in practical production.
Failure typically occurs during sintering due to high thermal stress and poor strength of LiH ceramics. The short sintering time has shown to be beneficial in preventing excessive grain growth and improving ceramic performance. In this study, we built a genetic algorithm back propagation artificial neural network (GA-BP-ANN) model to predict the strength margins under different work conditions. Sensitivity analysis showed that the thickness and end control time were the most relevant parameters for strength margins, and the GA-BP-ANN model demonstrated the most efficient sintering work condition for a given thickness. Through statistical analysis of the strength margin predicted by the GA-BP-ANN model, we found that the bilinear temperature control method expanded the range of safe sintering conditions by 30% compared to the linear temperature control method. The research results of this study may serve as a reference for the safe and efficient sintering of LiH ceramics.