Abstract The Graphene nanoplates (GNPs)/Lithium aluminosilicate (LAS) glass-ceramic composites were produced by hot-pressing sintering in vacuum condition. The flexural strength, fracture toughness, and thermal conductivity of the composites with different GNPs contents were investigated. The flexural strength and thermal conductivity reached maximum (137.17 ± 6.50 MPa and 1.98 W·m−1·K−1) when the content of GNPs increased to 2 wt%. When the GNPs content reached 3 wt%, fracture toughness reached maximum (5.45 ± 0.20 MPa·m1/2), which has obvious improvement compared with pure LAS glass-ceramic (1–2 MPa·m1/2). The mathematical models were induced to further investigate the effects of the agglomeration and content of GNPs on mechanical and thermal properties of the composite. The results show that the agglomeration of GNPs weakens the mechanical properties of the composites by reducing the energy dissipation of GNPs pull-out. The interfacial thermal resistance between the GNPs and LAS decreases initially followed by increasing, which will affect the thermal conductivity of the composites. This new material system will further expand the field of LAS ceramics in the future.

中文翻译：

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石墨烯纳米片 (GNP)/铝硅酸锂 (LAS) 复合材料的机械和热性能：基于数学模型和实验的分析

摘要 在真空条件下通过热压烧结制备了石墨烯纳米片（GNPs）/铝硅酸锂（LAS）微晶玻璃复合材料。研究了具有不同 GNPs 含量的复合材料的弯曲强度、断裂韧性和热导率。当 GNPs 的含量增加到 2 wt% 时，弯曲强度和热导率达到最大值（137.17 ± 6.50 MPa 和 1.98 W·m-1·K-1）。当GNPs含量达到3 wt%时，断裂韧性达到最大值（5.45±0.20 MPa·m1/2），与纯LAS微晶玻璃（1-2 MPa·m1/2）相比有明显提高。引入数学模型以进一步研究 GNP 的团聚和含量对复合材料机械和热性能的影响。结果表明，GNPs的团聚通过降低GNPs拉出的能量耗散来削弱复合材料的力学性能。GNPs和LAS之间的界面热阻先减小后增大，这将影响复合材料的热导率。这一新材料体系未来将进一步拓展LAS陶瓷领域。