Ｃ／Ｃ‐ＳｉＣ系ＦＧＭ燃焼器の耐久性評価に関する研究 （その１）

Abstract

Three kinds of carbon fibers-reinforced carbon matrix (C/C)-SiC functionally graded materials (FGM) chambers were cyclically tested using the bipropellant of nitrogen tetroxide (NTO)/monomethyl hydrazine (MMH) to evaluate the durability on life aiming for use in future reusable reaction control system (RCS) engines. The SiC/C FGM was applied to the layer between SiC and C/C base material in order to relax the difference in the thermal expansion of the two materials. The coating damage modes were inspected after each of the chamber dulability tests. On the first developed chamber, it has been found that the great damage was observed at contraction surface, and unexpectably, the damage was prematurely increased at near the impingement point, which showed the most low heat load, of the film cooling. On the second developed chamber, it also has been found that the damage especially at throat section was observed after 500 cycles of combustion. In the third developed chamber which was applied both of the 8-harness satin fabrics arrangement of the fibers and 40 μm FGM layer/C-SiC matrix, the damage seemed to be decreased compared with that of the first/second chambers.