Development of non-eroding rocket nozzle throat for ultra-high temperature environment |
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| Affiliation: | 1. Department of Mechanical Engineering, Pohang University of Science and Engineering (POSTECH), San 31, Hyoja-Dong, Nam-Gu, Pohang, Gyeongbuk, 790-784, South Korea;2. Division of Advanced Nuclear Engineering, Pohang University of Science and Engineering (POSTECH), San 31, Hyoja-Dong, Nam-Gu, Pohang, Gyeongbuk, 790-784, South Korea;3. Division of New Materials Engineering, Hanbat National University, 125 Dongseo Daero, Daejeon 305-719, South Korea;4. CetaTech, Inc., TIC 296-3, Seonjin-ri, Yonghyeon-myon, Sacheon, Kyungnam, 664-953, South Korea;5. Agency for Defense Development, Yuseong, P.O. Box 35-5, Daejeon 305-600, South Korea;1. College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, PR China;2. Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials, Hunan Toyi Carbon Material Technology Co., Ltd., Changsha 410000, PR China;3. Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076，PR China;4. State Key Laboratory of Advanced Design and Manufacturing for vehicle body, Hunan University, Changsha 410082, PR China |
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| Abstract: | The powder processing methods including powder metallurgy (P/M) and powder injection molding (PIM) techniques for tungsten (W)–rhenium (Re) were employed to produce a W–Re rocket nozzle. The composition of W–Re was determined by 25 wt.% of Re to avoid the formatting brittle sigma (σ) phase. The samples for analysis of the densification behavior on sintering were prepared by die pressing and cold isostatic pressing (CIP). The feedstock for the PIM process was produced by mixing the W–25 wt.% Re powder and binder system based on a wax-polymer with an optimum solid loading through the twin-extruder mixer. The injection molded specimens were debound to extract and decompose the binders via the solvent and thermal debindings. The debound samples were sintered in a hydrogen atmosphere. After sintering, hot isostatic pressing (HIP) was carried out in an argon atmosphere to enhance the density.The dilatometry experiments were performed to analyze and predict a densification behavior during sintering. The master sintering curve (MSC) model was used to characterize the densification behavior with a minimal set of preliminary experiments. The mechanical properties were evaluated through microstructure and chemical composition measured by EDX–SEM and X-ray diffraction (XRD).Finally, the eroding test was conducted using the W–25 wt.% Re rocket nozzle produced by PIM under the high temperature. After carrying out erosion tests, the erosion rate, hardness and microstructure were evaluated. |
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