Experimental study on defects of needled quartz fiber reinforced phenolic aerogel composites by cryogenic milling

Abstract Needled quartz fiber reinforced phenolic aerogel composite (NQF/PA) is a kind of lightweight thermal protection material commonly used in the aerospace field. With continuous development science and technology, design various spacecraft becoming more complex. Due to limitation preparation process, components are difficult be directly prepared formed. It often necessary carry out secondary processing order bond assemble into large-size combined system. Because NQF/PA composites have characteristics high toughness easy cracking matrix, it cause defects such as burrs, tearing edge collapse dry machining. Cryogenic machining can improve machinability fiber-reinforced composites. However, there still lack research on cryogenic In analyze feasibility technology for low-damage composites, this paper carried comparative experimental study analyzed influence spindle speed, feed rate radial cutting depth surface force. The showed that under same parameters, compared with machining, effectively reduce force suppress defects.