|
Thermal protection system is one of the key technology of reusable launch vehicle (RLV). After C/C and ceramic-matrix
composite used in space orbiter, one new-typed thermal protection systems (TPS)-ARMOR TPS is coming forth.
ARMOR TPS is means adaptable, robust, metallic, operable, reusable TPS. The ARMOR TPS has many advantages, for
example: fixing easily, longer life, good properties, short time of maintenance and service. The ARMOR TPS is one of
important candidate structure of RLV. ARMOR thermal protection system in foreign countries for reusable launch
vehicle is used instead of the traditional ceramic-matrix composite thermal protection system and C/C thermal protection
system. Also the constituent feature of ARMOR thermal protection system is much better than the traditional TPS. In
comparison with traditional TPS, the ARMOR TPS will be the best selection for all kinds of RLV. So the ARMOR
thermal protection system will be used in aviation and spaceflight field more and more widely because of its much better
performance. ARMOR TPS panel is above the whole ARMOR TPS, and the metal honeycomb sandwich structure is the
surface of the ARMOR TPS panel. So the metal honeycomb sandwich structure plays an important role in the ARMOR
TPS, while it bears the flight dynamic pressure and stands against the flight dynamic calefaction. The metal honeycomb
sandwich structure is made using the technique of the whole braze welding. In the course of the vacuum high
temperature braze welding, its surface will appear concave. The reasons which lead to the shortage are summarized and
discussed. The difference of thermal expansion coefficient and pressure between the core and the panels may be the chief
reasons. This paper will analyze the mechanics behavior of metal honeycomb sandwich structure in the course of the
vacuum high temperature braze welding, then make sure the reasons and get a way to solve it. Haynes214 is a good
material of face sheet at present. γ - TiAl and microlaminate materials are the candidate materials in the future.
|
