This work aims to improve heat resistance and mechanical properties of PEEK composites by filling the modified phosphates with inorganic particles (Si₃N₄, AlN, Al₂O₃ and Cu₂O) as reinforcements. The modified phosphate/PEEK composites were successfully prepared by pre-mixing and compression molding. The crystalline structures and compositions of modified phosphates and composites are characterized. Furthermore, the thermal and mechanical properties of composites were evaluated by thermal aging resistance at 350 °C for 24 h. The results show that all the four kinds of phosphate reinforcements can enhance the thermal aging resistance of phosphate/PEEK composites to varied extent. For the modified phosphate by Al₂O₃, its addition increases the 30% weight loss temperature (T₃₀) by 55 °C. Moreover, the compressive strength exhibits a 105.6% enhancement, reaching 321.4 MPa from 156.3 MPa of the PEEK matrix. This work provides a valuable route to improve the thermal and mechanical properties of PEEK composites, which would have promise applications in heat-resistant and high-strength structural materials.

这项工作旨在通过在改性磷酸盐中填充无机颗粒（Si ₃ N ₄，AlN，Al ₂ O ₃和Cu _2）来提高PEEK复合材料的耐热性和机械性能。O）作为增援。通过预混合和压缩成型成功地制备了改性的磷酸盐/ PEEK复合材料。表征了改性磷酸盐和复合物的晶体结构和组成。此外，通过在350°C下持续24 h的耐热老化性来评估复合材料的热和机械性能。结果表明，四种磷酸盐增强剂均可在不同程度上增强磷酸盐/ PEEK复合材料的耐热老化性能。对于通过Al ₂ O ₃改性的磷酸盐，其添加会增加30％的失重温度（T ₃₀）在55°C下。此外，抗压强度显示出105.6％的增强，从PEEK基体的156.3 MPa达到321.4 MPa。这项工作为改善PEEK复合材料的热和机械性能提供了一条有价值的途径，这有望在耐热和高强度结构材料中得到应用。