| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of solving a problem that a structural material in a solid fuel rocket nozzle is deeply eroded by the local erosion. SOLUTION: 1. A carbon-carbon fiber composite material (C/C ) or the like treated to form graphite (carbyne) to prevent the production of the thermally decomposable gas at an operation temperature is used as the structural material. 2. This erosion resistant coating film is formed by sticking or vapor-depositing vitreous carbon or CVD carbon on the surface. 3. The thickness of the provided coating film is determined corresponding to the failure probability of 1/10<SP>6</SP>on reliability and for an example, the maximum thickness of a nozzle throat is B≥5.66 mm in the vitreous carbon film and B≥3.83 mm in the CVD carbon film under a combustion condition of about 100 Bar pressure, about 3,000°C temperature and about 100 sec combustion time. 4. An ultrasonic (about 20 KHz) excitation erosion test or a liquid jet stream collision erosion test at a normal temperature is carried out and the temperature characteristics of the erosion is estimated from the temperature characteristics of tensile strength data. COPYRIGHT: (C)2005,JPO&NCIPI
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