1 500℃极端高温环境下高超声速飞行器轻质隔热材料热/振联合试验

The long-range hypersonic vehicle is in an extremely harsh aerodynamic heating and vibration coupling environment. The combination of the severe high-temperature and long-time vibration environment can cause cracks, misalignment, peeling or falling off of the aircraft's thermal protection materials, and even lead to fatal safety accidents. Therefore, the ground thermal/ vibration test of thermal protection materials in ultra-high temperature environment is extremely important for the safety and reliability design of hypersonic vehicles. In this paper, a high-temperature heat/vibration combined test system is established. The difficulty of measuring and controlling the surface temperature of lightweight porous insulation materials under the strong vibration is solved. Water-cooled heat insulation device is designed to protect the expensive vibration excitation equipment. The experiment realizes the thermal/ vibration test of insulation materials for hypersonic vehicle at 1 500℃, obtaining the fracture morphology and crack section characteristics of the non-metallic insulating material of ceramic fiber plate. The test results of the appearance and microscopic changes of the materials before and after the test and the changes of the internal binder show that the material property is improved and the performance requirement is satisfied. The thermal/vibration combined test system under extreme high-temperature environment up to 1 500℃ and the test results provide an important basis for the evaluation of the anti-vibration capability, the determination of the thermal insulation effect, and the improvement of the material property of the thermal protection material for the long-range hypersonic vehicle.