科研之友
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摘要
Mullite fiber sealing pad composed of chopped fibers and aqueous silica binder, having near-isotropic structure, was fabricated by a combination of vacuum filtration and colloidal processing. The fibers were randomly distributed, overlapping and interlocking to produce the matrix and pure SiO2 binder composed of a glass-ceramic structure firmly bonded fiber laps. A microwave micro-zone heater was adopted to simulate transient aerodynamic heating process and 8-cycle loading unloading test was conducted at 800 degrees C. The samples were sintered at 1300 degrees C with different silica sol concentrations (10.3-20.9 wt%). Mullite fiber pads exhibited high rebound resilience (80.9-87.6%), high compression (24-18%) and moderate Young's modulus (0.97-3.24 MPa), making it to be a promising high-temperature seal material.
