Cold-Sintered Zrw2o8/Sio2/Sio2f Wave-Transparent Composites: Design and Fabrication of Interfacial Anti-Debonding Structures Based on Polymeric Films

Abstract

The interfacial debonding effect on composites limits their wide application in aerospace. This work utilized the unique water-retention properties of hyaluronic acid by adding it to the sintered liquid phase to form polymeric films. A polymeric film wrapped extended sintering time strategy was adopted to synthesize the interface structure with anti-debonding properties. This interface bonding structure enhances the sintering densification of ZrW2O8/SiO2/SiO2f composites and effectively improves operational accuracy by providing creep resistance. Furthermore, the interface bonding structure reduces the composites' interfacial polarization and reflection loss, enhancing wave-transparent properties in the 2–18 GHz frequency range. Simultaneously, the composites achieve a controllable coefficient of thermal expansion (CTE) by regulating the liquid phase content and reach near-zero CTE (-0.246 × 10-6 °C-1 [30–300 °C]). Finally, the connection between the thermodynamics and sintering densification of composites was revealed by finite element analysis, and it was deduced that increasing sintering densification is beneficial in reducing the thermal stresses and strains inside the composites. This approach effectively solves the interface debonding problem of composites and provides a unique route to design composites.

Keywords: polymeric films, interface anti-debonding, near-zero thermal expansion, Finite Element Analysis, cold sintering process