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Currently, materials that absorb electromagnetic waves (EMW) are being increasingly studied and used. In particular, numerous attempts have been made to improve the performance of EMW-absorbing ceramics, but little attention was paid to the effect of doping on their relevant properties. In this work, Ti 3 AlC 2 , a typical MAX-phase ceramic, was doped with different elements (Zr, Mo, Cr, Fe and Ni) at the M site via a pressure-free reactive sintering. Phase and microstructure analysis show that the doped Ti 3 AlC 2 samples possess high purities and typical layered structures. It was noticed that (Ti 0.8 Zr 0.2) 3 AlC 2 demonstrates the lowest reflection loss (−48.0 dB at the thickness of 1.62 mm) and a maximum effective absorption bandwidth of 3.9 GHz. Elemental doping has been proved to alter the dielectric and magnetic properties of Ti 3 AlC 2 , and the boosted EMW absorption performance was found to be originated from the improved impedance matching. Here, we systematically investigated the influence of different dopants on the EMW absorption characteristics of Ti 3 AlC 2 , which provides significant insights for the future design of novel EMW-absorbing materials. [ABSTRACT FROM AUTHOR]

The incorporation of a significant amount of organic materials in the fabrication process of Al 2 O 3 ceramics using digital light processing (DLP) 3D printing technology leads to a noticeable reduction in mechanical properties compared to those prepared using traditional methods. To enhance its mechanical performance of Al 2 O 3 ceramics, the addition of MgO and MgO-Y 2 O 3 sintering additives, along with a three-step curing method, has resulted in significant improvements. Al 2 O 3 ceramics fabricated with the addition of MgO exhibited a flexural strength of 454.2 MPa, Vickers hardness of 20.24 GPa and apparent porosity of 0.15 %. Similarly, the addition of MgO-Y 2 O 3 yielded Al 2 O 3 ceramics with a flexural strength of 491.6 MPa, Vickers hardness of 20.91 GPa, and apparent porosity of 0.11 %. These values exceed the typical flexural strength of Al 2 O 3 ceramics prepared using traditional methods. This research provides a fundamental basis for the production of high performance, dense, and complex shaped Al 2 O 3 ceramics using DLP 3D printing technology. [ABSTRACT FROM AUTHOR]

The incorporation of a significant amount of organic materials in the fabrication process of Al 2 O 3 ceramics using digital light processing (DLP) 3D printing technology leads to a noticeable reduction in mechanical properties compared to those prepared using traditional methods. To enhance its mechanical performance of Al 2 O 3 ceramics, the addition of MgO and MgO-Y 2 O 3 sintering additives, along with a three-step curing method, has resulted in significant improvements. Al 2 O 3 ceramics fabricated with the addition of MgO exhibited a flexural strength of 454.2 MPa, Vickers hardness of 20.24 GPa and apparent porosity of 0.15 %. Similarly, the addition of MgO-Y 2 O 3 yielded Al 2 O 3 ceramics with a flexural strength of 491.6 MPa, Vickers hardness of 20.91 GPa, and apparent porosity of 0.11 %. These values exceed the typical flexural strength of Al 2 O 3 ceramics prepared using traditional methods. This research provides a fundamental basis for the production of high performance, dense, and complex shaped Al 2 O 3 ceramics using DLP 3D printing technology. [ABSTRACT FROM AUTHOR]