The mechanics of structural ceramics, especially the toughness, are crucial to their service reliability and need to be continuously optimized. Inspired by the “brick-mortar” structure and further adjusting the microstructure of “mortar” on the interface, ceramic with strength and toughness up to 444.16 MPa and 13.79 MPa∙m^1/2 is constructed by hot pressed sintering with alumina (Al₂O₃) as brick and vertical graphene (VG) with active atomic edges as mortar. Relying on the covalent interface between VG grown in-situ and Al₂O₃, the sliding of Al₂O₃ links the shear-deformation process of the crosslinked and interlocked nanointerface formed by VG, making the VG-enhanced Al₂O₃ ceramics (AVG) obtain super toughness. Moreover, the structure of interlocked VG-nanointerface exhibits an excellent high-temperature resistance, which makes AVG still show the excellent strength of 437.66 MPa and toughness of 11.16 MPa∙m^1/2 after heat treatment at 1500 °C for 100 h and they are respective 2.51 times and 3.18 times higher than Al₂O₃ in the same condition. This work provides a new thought for the preparation of high-strength, ultra-tough and high-temperature mechanical stable ceramics.

中文翻译：

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3D 交联和互锁石墨烯纳米界面可实现超韧和坚固的氧化铝


结构陶瓷的力学性能，尤其是韧性，对其使用可靠性至关重要，需要不断优化。受“砖-砂浆”结构的启发，并进一步调整了“砂浆”在界面上的微观结构，以氧化铝 （Al₂O₃） 为砖和具有活性原子边缘的垂直石墨烯 （VG） 为砂浆，通过热压烧结构建了强度和韧性高达 444.16 MPa 和 13.79 MPa∙m^1/2 的陶瓷。依靠原位生长的 VG 与 Al₂O₃ 之间的共价界面，Al₂O₃ 的滑动连接了 VG 形成的交联和互锁纳米界面的剪切变形过程，使 VG 增强的 Al₂O₃ 陶瓷 （AVG） 获得了超强的韧性。此外，互锁的VG-纳米界面结构表现出优异的耐高温性能，这使得AVG在1500 °C热处理100 h后仍表现出优异的强度为437.66 MPa，韧性为11.16 MPa∙m^1/2，在相同条件下分别比Al₂O₃高2.51倍和3.18倍。本工作为制备高强度、超韧和高温机械稳定陶瓷提供了新的思路。