Several thermal protection methods were proposed according to the thermal environment requirements
in application. The thermal insulation property of different thermal protection materials and structures was tested by
the quartz radiation heating method. The effects of thermal protection coating, structure and material on the thermal
insulation property were investigated. Results show that the thermal protection coating can significantly lower the back
temperature of the sample. Compared to the general glass fabric reinforced phenolic resin laminate panel, the sand鄄
wich test panel prepared by glass fabric honeycomb and polyimide composite panel has lighter weight and good thermal
insulation property. The area weight of honeycomb sandwich was only 50% of the laminate panel. And the area
weight of sandwich with polyimide composite panel was about 80% of sandwich with phenolic composite panel. The
back temperature of sandwich with polyimide panel covered by the thermal protection coating was only 246益.