2022 Fiscal Year Final Research Report

Hyper converged method aiming to apply higher toughness for SiC ceramics composite thruster.

Research Project

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Project/Area Number	19H00799
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Review Section	Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
Research Institution	Muroran Institute of Technology
Principal Investigator	Kishimoto Hirotatsu 室蘭工業大学, 大学院工学研究科, 教授 (30397533)
Co-Investigator(Kenkyū-buntansha)	柴山環樹北海道大学, 工学研究院, 教授 (10241564) 芹澤久大阪大学, 接合科学研究所, 准教授 (20294134) 中里直史室蘭工業大学, 大学院工学研究科, 助教 (70714864) 中田大将室蘭工業大学, 大学院工学研究科, 准教授 (90571969)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	セラミックスラスタ / SiC/SiC複合材料 / NITE法 / 燃焼試験 / 長繊維強化
Outline of Final Research Achievements	This research developed a fabrication process of a long fiber reinforced SiC/SiC thruster for aerospace systems using NITE method. The thruster is difficult to fabricate one time process of the NITE method, therefore NITE SiC/SiC segments which are parts having convenient shapes for the NITE process were produced followed by being united by an outer SiC/SiC structure fabricated by the PIP method. But the joints and interface of the thruster were fragile, it was consolidated by an applied reaction sintering method, and it was successfully established. A combustion test was performed for NITE SiC/SiC thruster. Gas oxygen and Gas hydrogen were used as propellant, the thruster was attached to a water-cooled combustor, and the flange was sealed by carbon gaskets. Though it is necessary to note that the available oxygen/fuel ratio was limited, and the exposure time was very short, the combustion was efficient, and the NITE SiC/SiC thruster did not suffer apparent damage in this research.
Free Research Field	材料工学
Academic Significance and Societal Importance of the Research Achievements	長繊維強化のセラミックス複合材料は製作が難しいため、航空宇宙機用スラスタは低靭性を忍んでもモノリシックセラミックスで製作されている。耐熱性と化学安定性が高いNITE-SiC/SiCで全体を形成するのは難しいが、本研究では最適手段を組み合わせれば製作可能であることを示した。例えばPIP材は耐熱性は低いが成型に加圧が不要で複雑形状にしやすく、NITE材とはRS法で一体化可能である。水素と酸素を推進剤に使ったSiC/SiCスラスタの燃焼実験では、この系の燃焼は高効率であることが示され、ガス供給法やシール法など様々な技術的知見が得られた。これらは航空宇宙機だけでなく水素エンジンにも利用可能である。