Experimental-analogic Method Research For Properties Of Materials In Re-entry Atmosphere Environment

C/SiC ceramic matrix composite is a new kind of thermo-structure material. It has been a key thermo-structure material for the 2nd generation spacecraft because of excellent high temperature performance, oxidation resistance, friction property and low density, etc. According to aerodynamic heating environment of re-entry atmosphere and specialties of C/SiC components, C/SiC ceramic matrix composite has excellent stressed oxidation and ablation resistance for the reuse of thermo-structure components. Its good hot joint property meets the need of manufacture for big complex thermo-structure components. It has good friction and wear property at high temperature, high load and low rotation speed, which satisfies the application of movable thermo-structure components such as rudder, body flap, etc. So it is important to research the stressed oxidation and ablation resistance property, hot joint property and friction and wear property of C/SiC ceramic matrix composite for applications in spacecraftAccording to research materials' stressed oxidation and ablation property, hot joint property and friction and wear property at high temperature, high load and low rotation speed in re-entry atmosphere environment, an experimental-anologic facility was designed and manufactured. It was composed of common pressure subsonic gas-fired wind tunnel, material test machine and servo-drive instrument. The main contents and results are as follows:1. A common pressure subsonic gas-fired wind tunnel was designed and manufactured. It is feasible to simulate the re-entry hot physical chemistry environment. The heating efficiency of this wind tunnel is high, it can reach 1800℃ in a few minutes. The elements of fired gas are close to atmosphere. The wind tunnel has a long run-time (nearly 30min).2. Servo-drive instrument was designed and manufactured. It is feasible to simulate the movement of the hinge of movable components such as body flap, rudder, etc. It can control the rotation speed (0~128r/min) and torque (0-50N · m ) of test samples at high temperature and high load.3. Samples and clamps were designed and made to research stressed oxidation and ablation property, hot joint property and friction and wear property at high temperature, high load and low rotation speed. The samples and clamps were not damaged abnormally during testing. So the design of samples and clamps are viable.4. C/SiC stressed oxidation and ablation test, hot joint test and friction and wear test were successfully conducted by the experimental-anologic facility. The results of tests show that the facility meets the design specification.