Polymer-ceramic composites are widely applied in microwave substrate materials due to the excellent dielectric properties and simple preparation process recently. Polytetrafluoroethylene-based (PTFE) composites filled with Zn_0.5Ti_0.5NbO₄ (ZTN) ceramic particles were fabricated by hot-pressing. The particles were modified by C₁₄H₁₉F₁₃O₃Si to enhance the interface compatibility between PTFE and ZTN powders, which was characterized by X-ray photoelectron spectroscopy (XPS) and contact angle. The surface characteristic of particles transformed into hydrophobicity and tight microstructure as well as better dielectric properties were obtained after the surface modification. The microstructure, dielectric, thermal, mechanical properties, and water absorption of the composites concerning ZTN content were investigated. Modified ZTN/PTFE composites with 50 vol% ZTN particles exhibit excellent dielectric properties with a high dielectric constant of 8.3, an extremely low dielectric loss of 0.00055 at 7 GHz, and a stable temperature coefficient of the dielectric constant of −12.2 ppm/°C. All the properties show modified ZTN particles filled PTFE composite is the potential material for microwave substrate application.

高分子陶瓷复合材料由于其优异的介电性能和简单的制备工艺而被广泛应用于微波基材。通过热压制备了填充有Zn _0.5 Ti _0.5 NbO ₄（ZTN）陶瓷颗粒的聚四氟乙烯基（PTFE）复合材料。颗粒通过C ₁₄ H ₁₉ F ₁₃ O ₃改性Si可增强PTFE和ZTN粉末之间的界面相容性，这通过X射线光电子能谱（XPS）和接触角来表征。表面改性后，获得了转变为疏水性和紧密的微结构的颗粒表面特性，以及更好的介电性能。研究了涉及ZTN含量的复合材料的微观结构，介电性能，热性能，机械性能和吸水率。具有50％（体积）ZTN颗粒的改性ZTN / PTFE复合材料表现出优异的介电性能，具有8.3的高介电常数，在7 GHz时极低的介电损耗0.00055和介电常数的稳定温度系数-12.2 ppm /°C 。