Carbon fiber reinforced polymer composites have excellent comprehensive mechanical properties.

The chemical composition and fracture toughness of thermal barrier coatings (TBCs) before and after heat treatment were characterized, and the cracks around the interface between the coating and the substrate could be successfully eliminated and meanwhile the porosity of the coatings tended to reduce. The XRD analysis revealed the coatings were composed of non-transformable tetragonal t’ phase of ZrO ₂ and γ $\gamma $ -(Ni, Cr) with minor Ni3Al ( γ ′ $\gamma ^' $ ) precipitates. Additionally, the relationship between the heat treatment and wear resistance was systematically studied. The results indicated that both the hardness and fracture toughness increased after quenching process. The oxidation wear became more prominent after heat treatment, which probably resulted from the better bonding strength of coatings. Dense and homogeneous microstructure introduced by vacuum oil-quenching improved stabilization of the weight gain during thermal cycle test.

After total joint replacement surgery, frequent injection of lubricating substances is required due to lubrication failure caused by the absorption of lubricants by the human body, which will cause serious physiological and psychological burdens on patients. In this study, with the help of surface texture aggregation of particles, gelatin microgel particles with a diameter of about 4 μm were used as lubricating substances to achieve aggregation in the texture, thus improving the friction environment under low-concentration lubricants. The study found that the rectangular cross-sectional texture demonstrated the most effective anti-friction properties, resulting in a 26% reduction in friction coefficient compared to non-textured surfaces. Additionally, utilizing comsol for particle flow simulation, researchers observed the motion behavior of particles within the texture and clarified the mechanism of particle aggregation and the improvement of lubrication on the surface. This article confirms the beneficial effects of combining surface texture and particles on lubrication, thus providing valuable insight for improving lubrication in dilute particle solutions.

As one of the main forming processes in Additive Manufacturing (AM), FDM (Fused Deposition Modeling) has the advantages of low cost, fast speed, no need for molds during forming, high forming flexibility, and can quickly adapt to customized market demands. Therefore, it has received increasing attention in recent years. During the use of FDM products, the mechanical properties, especially the impact performance of FDM products are also of great concern. It has been investigated that the influence of FDM forming process parameters, including layer thickness, infill density, and infill pattern, on the impact performance of polylactic acid (PLA) in this article with the single factor method. The range analysis results indicate that the infill density has the greatest impact on the impact performance of PLA, followed by layer thickness. In addition, the infill pattern also has a significant impact on the impact performance of PLA.