Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Effect of Sintering Temperature on Microstructure and Flexural Strength of 2.5D SiO2f/SiO2 Composites
Quartz fiber reinforced quartz ceramic matrix composites (SiO2f/SiO2 CMCs) are widely used in aerospace aircraft for the excellent thermal and wave resistance properties. With the increasing Mach number of aircraft, the mechanical properties of antenna window components and radome are increasingly required. In this paper, 2.5D SiO2f/SiO2 CMCs were prepared using precursor impregnation pyrolysis (PIP) method at different sintering temperatures (550~850 ?). The effects of sintering temperature on the density, porosity, microstructure, flexural strength and toughness of 2.5D SiO2f/SiO2 CMCs were systematically studied in order to obtain high strength and toughness sintering technology. The results showed that the density of the SiO2f/SiO2 CMCs increased with the increased of sintering temperature, while the porosity decreased first and then increased. It was attributed to the increased of SiO2 matrix shrinkage, and the shrinkage at 850 ? seriously produced microcracks. The SiO2 matrix changed from particle bonding (rough) to ceramic melting (smooth). Meanwhile, the bonding of fiber and matrix changed from weak to strong. The flexural fracture behaviors of the SiO2f/SiO2 CMCs were closely related to the microstructural evolutions. As the sintering temperature increased, the toughness of the SiO2f/SiO2 CMCs decreased gradually, because the strong bonding between the fiber and the matrix affected the fiber pullout effect. The flexural modulus increased gradually, while the flexural strength increased first and then decreased, with the highest value of 71 MPa at 700 ?. Only when the SiO2 matrix reached a certain modulus, the toughness of SiO2f/SiO2 CMCs could be fully utilized. Finally, the optimal sintering temperature was determined to be 700 ?, at which the SiO2f/SiO2 CMCs could achieve the optimal flexural strength and toughness.
» Reference: 10.1007/s12633-023-02814-8
» Publication Date: 11/12/2023
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
