Properties of Composite Thermal Shroud of Stainless Steel Pipe-Aluminum Profile

Thermal shroud is the key component of space environment equipment,and the material properties of thermal shroud is directly related to the performance of thermal shroud and even the performance of space environment equipment.The performance characteristics of commonly used thermal shroud materials as well as some thermal shroud materials and structures at home and abroad are briefly described.Acomposite thermal shroud of stainless steel pipe-aluminum profile has been developed,and the composite finned tube is produced by expanding a stainless steel pipe into the aluminum finned tube.The pressure and temperature uniformity of vacuum chamber before and after loading thermal shroud have been tested,and the results show that the gas load of the thermal shroud is small and does not affect pressure of no-load vacuum chamber,In the range of-35~70 ℃,the overall temperature inhomogeneity of the thermal shroud is-2.3~2.5℃,in the range of 10~70℃,the temperature rise rate is 2.73℃/min,and in the range of-35~20℃,the temperature reduction rate is 1.82℃/min,which can meet the requirements of environment simulation experiments.Aluminum alloy and stainless steel have their own charactristics in the composite thermal shroud,which makes the thermal shroud with high reliability,light weight,low cost,convenient and quick processing and boasts definite prospects for a variety of applications.In the future,it is necessary to study further the expansion process of the stainless steel tube and the aluminum finned pipe to reduce the thermal contact resistance.