Mechanical, Dielectric, and Microwave-Absorption Properties of Alumina Ceramic Containing Dispersed Ti3SiC2

Abstract

Dense Al 2 O 3 ceramics containing dispersed Ti 3 SiC 2 were fabricated by hotpressed sintering. Effects of Ti 3 SiC 2 content on the mechanical, dielectric, and microwave-absorption properties of the ceramics were investigated. The bulk density, flexural strength, and dielectric constant were enhanced by increasing the Ti 3 SiC 2 content. The complex permittivity increased dramatically when the Ti 3 SiC 2 content was above the percolation threshold. The dielectric performance of the ceramics at high temperatures was also studied. The results revealed increases in both the real and imaginary parts with increasing temperature. Ceramic 2.2 mm thick containing 10% (w/w) Ti 3 SiC 2 had the optimum microwave-absorption properties. The absorption bandwidth below À5 dB was in the range 8.2-12.4 GHz with a minimum value of À20 dB at 9.56 GHz. Although the reflection loss increased with the increasing temperature, the ceramic still had favorable microwave-absorption properties throughout the X-band. This study contributes to the development of the microwave absorption materials for high-temperature application.

Temperature dependence of the electromagnetic and microwave absorption properties of polyimide/Ti3SiC2 composites in the X band

“…5, it can be deduced that with a 30 wt% Ti 3 SiC 2 content and 2.5 mm thickness, the optimum absorption characteristics can be obtained. The results are better than those of Liu et al 32 and Shi et al 14 The simulated absorption loss curves of the polyimide/Ti 3 SiC 2 composite with the increasing temperature are respectively presented in Fig. 6(a)-(d).…”

Wide-Band Tunable Microwave-Absorbing Ceramic Composites Made of Polymer-Derived SiOC Ceramic and in Situ Partially Surface-Oxidized Ultra-High-Temperature Ceramics

“…Figure e summarizes the microwave absorption bandwidth of typical ceramic-based composites reported in recent literature. − ,,,,,,− It can be seen that the nanocomposites show a significantly broad bandwidth of 13.5 GHz compared with that of other ceramic-based composites, such as oxide-based, PDC-based, and other ceramic-based composites. Besides, the excellent microwave absorption property of the nanocomposites is obtained under a much higher frequency band than other ceramic-based composites.…”

Microstructures and Mechanical Properties of Ti3SiC2/Al2O3 and Ti3SiC2-TiC/Al2O3 Composite Ceramics by Modifying Al2O3 Content Via in-situ Synthesized

“…Composite ceramics can be synthesized by various of sintering methods, such as self-propagating high-temperature sintering (SHS) [17], spark plasma sintering (SPS) [18] and hot pressing (HP) [19,20]. Qi et al [21] fabricated…”