Microwave-absorbing materials that are used for stealth weapons and equipment should have excellent characteristics of strong absorption, a wide absorption bandwidth, low thickness, and light weight. Ti 3 C 2 T x , as a twodimensional (2D) MXene material, shows great potential in the field of microwave absorption. However, MXene has problems of impedance mismatch, a narrow absorption bandwidth, and poor absorption performances. In this study, we designed a series of ZIF-8/MXene-based microwave-absorbing materials known as porous ZnO/MXene nanocomposites, which were synthesized by an in situ composite method before being annealed under vacuum. Then, the structure and performances of porous ZnO/MXene were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and using a vector network analyzer (VNA). We investigated the influences of the mass ratio, microstructure, morphology, and microwave absorption performances of the samples on raw materials. As a result, ZnO/MXene nanocomposites with a mass ratio of Zn 2+ / MXene = 2:1 showed the optimum microwave absorption performance. The minimum reflection loss was −34.31 dB at 8.8 GHz (thickness 1.0 mm), and the effective absorption bandwidth was 3.47 GHz from 13.49 to 16.96 GHz.

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Solid lubricant materials could be used in various extreme conditions owing to the excellent anti‐friction and ‐wear with the low friction coefficient and wear rate. Polyurethane (PU)‐based solid lubricants as one of the widely utilized composite materials had been well‐known by researchers all over the world. PU‐based composite lubricants were commonly segmented into single‐phase lubricants and multi‐phase lubricants via inorganic or organic lubricant additives. What is more, the modified PU by solid lubricants would endow higher tribological performances than that of single‐phase PU‐based lubricants. Based on the multi‐component synergy, the multi‐phase lubricants could significantly improve the PU matrix's lubrication and wear resistance and enhance the comprehensive performance such as corrosion resistance. This paper mainly discussed and summarized the recent development in tribological performances of PU‐based composite lubricants, and explored their prospective research directions.

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