## 1 Introduction
These additions can improve the mechanical properties of polyetheretherketone and make it more suitable for various engineering applications. [PERSON] et al. [15] prepared polyetheretherketone (PEEK) nanocomposites with different contents of zinc oxide nanoparticles. It was determined that the Young's modulus was enhanced by 9% and tensile strength by about 4.6% when using 2.5% zinc oxide nanoparticles. However, when using 7.5% zinc oxide nanoparticles, the Young's modulus and tensile strength were gradually decreased and were not as good as those of unfilled PEEK. Carbon nanotubes (CNTs) were blended with PEEK to form composites. The high strength and stiffness of carbon nanotubes can significantly enhance the mechanical properties of PEEK, such as its strength, stiffness, and wear resistance [16]. Carbon nanotubes can establish a mesh structure in the PEEK matrix, which effectively prevents crack extension and, thus, enhances the tensile and flexural properties of the material [17]. [PERSON] et al. [18] prepared a PC5 (PEEK-5% MWCNTs) composite by adding 5% MWCNT to PEEK material; the flexural strength was enhanced from 130.16 MPa to 181.30 MPa for the polyetheretherketone material, representing an increase of 39.29%. Therefore, the use of PC5 for low-stress implants has promising application prospects. The unique structure and properties of graphene oxide can enhance the mechanical strength of polyetheretherketone (PEEK). Graphene oxide is an oxidized graphene derivative with numerous hydroxyl and carboxyl groups as well as other functional groups, which can interact with polyetheretherketone molecules via hydrogen bonding and covalent bonding. Due to the high specific surface area and good mechanical properties of graphene oxide, the addition of it can effectively enhance the mechanical properties of the PEEK matrix [19]. In addition, graphene oxide can improve the thermal stability, abrasion resistance, and chemical resistance of polyetheretherketone. Therefore, graphene oxide composites with polyetheretherketone can significantly improve their overall propertiesand make them more widely applicable in engineering [20]. [PERSON] et al. [21] prepared graphene oxide (GO)-reinforced PEEK nanocomposites with different graphene oxide loadings. Reinforcement with graphene oxide at 0.5% and 1.0% contents showed the highest flexural strength of 160 MPa (33.33% greater than that of pure PEEK), and the composites' compressive strength far exceeded that of pure PEEK. Promising strategies have been proposed for preparing PEEK-based composites with excellent biomechanical properties for future hard tissue repair applications. Multi-component composites are usually made by combining two or more different materials. They are designed to capitalize on the strengths and compensate for the weaknesses of each material. Polyetheretherketone (PEEK) is often used as a matrix material, while other materials, such as carbon fibers, glass fibers, ceramics, hydroxyapatite, and multi-walled carbon nanotubes, are used as reinforcements. This combination produces more robust, more heat- and corrosion-resistant composites, which not only have the advantage of being lightweight but also improve the strength and durability of the material. [PERSON] et al. [22] developed a unique PEEK bioactive ternary composite, PEEK/n-HA/CF. It was found that the elastic modulus of the PEEK/n-HA/CF ternary composite was 16.5 \(\pm\) 0.7 GPa when the mass ratio of PEEK:n-HA:CF was 55:25:20, which was in the range of 6-30 GPa for human cortical bone, paving the way for PEEK-based ternary composites in many challenging dental and orthopedic applications for bone repair materials. Ultrasonic treatment is a technology for material treatment that uses ultrasonic waves to propagate and reflect inside the material. Wet blending is a processing method that is usually used in the preparation of powder materials. In this method, the powder material is usually mixed with a liquid or solution and then dried to form the desired product.