Bonding strength and thermal shock resistance of rhenium coating on fabric-base pierced carbon-carbon composites substrate prepared by chemical vapor deposition
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, rhenium coatings were prepared on fabric-base pierced carbon-carbon substrates by chemical vapor deposition. Bonding strength and thermal shock resistance of rhenium coating on carbon-carbon substrates were investigated respectively. The bonding strength between the coating and the substrate was tested using different methods including tensile tests and shearing tests. Thermal shock resistance was investigated by induction furnace from high temperature (2000 ℃) to room temperature in air atmosphere. The characteristics of the coatings after the thermal shock test were studied by scanning electron microscopy (SEM). The results indicated that the highest average value of tensile fracture strength is 20.4 MPa and shearing fracture strength is 21 MPa on the XZ-direction of the fabric-base pierced carbon-carbon composites. The thermal shock lives depended on the number of thermal shock cycles and the thickness of rhenium transition layer. It is also concluded that cracks occured when the samples were cooled to 1100℃.
rhenium coating carbon/carbon composites bonding strength thermal shock resistance
Guo Yue Zhang Hong Bai Shu-xin Ye Yi-cong
College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China
国际会议
北京
英文
712-715
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）