Abstract
Rhenium is a promising coating material for liquid rocket nozzles because of its extremely superior performance, such as high melting point, high temperature strength and excellent fatigue properties. In this work, Re coating was prepared on fabric-based pierced Carbon/Carbon composite substrate using chemical vapor deposition. Bonding strength, micro hardness and thermal shock resistance of rhenium coating on Carbon/Carbon substrate were investigated respectively. The bonding strength between the coating and the substrate was tested using different methods including tensile tests, shearing tests and micro scratch tests. Thermal shock resistance was investigated by an induction furnace from 2000oC to the room temperature. The morphologies and characteristics of the coatings were studied by scanning electron microscopy. The results indicated that the highest average value of tensile fracture strength is 20.4MPa and shearing fracture strength is 21MPa on Carbon/Carbon composite substrate. The rhenium coating broke up and flaked off near a crack in the scratch test. Micro hardness test suggested that C atoms diffused quickly into the rhenium coating within an hour. The thermal shock lives depended on the number of thermal shock cycles. It is also concluded that rhenium coating had good thermal shock resistant with Carbon/Carbon Composite substrate.
Published Version
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