火箭推进

为验证C/SiC复合材料喷嘴在液-固两相流实际环境中的应用可行性,采用化学气相沉积工艺和先驱体浸渍-裂解工艺制备了C/SiC复合材料喷嘴的,并充分结合工程化应用背景需求,对C/SiC复合材料喷嘴在实际应用环境中进行长寿命考核。基于C/SiC复合材料喷嘴在实际应用考核过程中表现出的冲蚀磨损特征,采用SEM手段分析了C/SiC复合材料喷嘴不同位置在液-固两相流中微观结构演变特点,并对其冲蚀磨损机理进行探讨。结果表明:C/SiC复合材料喷嘴从试验件入口段到出口段表现出逐渐加剧的冲蚀磨损程度,冲蚀磨损方式主要由冲蚀凹坑和热应力“崩块”组成,而“偏磨”现象产生的主要原因为C/SiC复合材料各向异性和液-固两相流的不均匀性所致。

For validating application feasibility of C/SiC composite nozzle in the liquid-solid two phase flow in the actual environment, the C/SiC composite nozzle was fabricated by the chemical vapor deposition process and preceramic polymer impregnation pyrolysis process, combined with engineering application background of C/SiC composites nozzle. Long life assessment was also carried out in actual enviroment. Based on erosion wear characteristics of the C/SiC composites nozzles during the assessment process, SEM analysis was made used for the liquid-solid two-phase flow characteristic, microstructure evolution and the erosion wear mechanisms with different location of the nozzle. The results show that the C/SiC composite nozzle exhibits an increasing degree of erosion wear from the inlet end to the outlet section of the test piece. The erosion wear mode is mainly composed of erosion pit and thermal stress “crash”, and the main cause of the “biasing” phenomenon is the anisotropy of the C/SiC composite and the non-uniformity of the liquid-two-phase flow.

引言
1 材料制备及试验方法
2 结果与讨论
3 C/SiC复合材料喷嘴冲蚀磨损机理
4 结论

图1 试验考核系统示意图<br/>Fig.1 Schematic of experimental evaluation system

图1 试验考核系统示意图
Fig.1 Schematic of experimental evaluation system

图2 试验前后C/SiC复合材料喷嘴宏观照片对比情况<br/>Fig.2 Picture contrast of C/SiC composites nozzle before and after test

图2 试验前后C/SiC复合材料喷嘴宏观照片对比情况
Fig.2 Picture contrast of C/SiC composites nozzle before and after test

图3 C/SiC复合材料喷嘴剖切方案示意图<br/>Fig.3 Schematic of C/SiC composite nozzle cutting plan

图3 C/SiC复合材料喷嘴剖切方案示意图
Fig.3 Schematic of C/SiC composite nozzle cutting plan

图4 试验件入口段SEM照片<br/>Fig.4 The SEM photos of test pieces entrance segment

图4 试验件入口段SEM照片
Fig.4 The SEM photos of test pieces entrance segment

图5 试验件中间锥面段SEM照片<br/>Fig.5 The SEM photos of test pieces cone segment

图5 试验件中间锥面段SEM照片
Fig.5 The SEM photos of test pieces cone segment

图6 试验件出口直线段SEM照片<br/>Fig.6 The SEM photos of test pieces export line segment

图6 试验件出口直线段SEM照片
Fig.6 The SEM photos of test pieces export line segment

图7 试验件出口段SEM照片<br/>Fig.7 The SEM photos of test pieces export segments

图7 试验件出口段SEM照片
Fig.7 The SEM photos of test pieces export segments

图8 C/SiC复合材料喷嘴出口段冲蚀磨损后宏观照片<br/>Fig.8 Photo of C/SiC composites nozzle after erosion wear

图8 C/SiC复合材料喷嘴出口段冲蚀磨损后宏观照片
Fig.8 Photo of C/SiC composites nozzle after erosion wear

图9 C/SiC复合材料喷嘴出口段环向密度与壁厚分布情况<br/>Fig.9 Ring density and thickness distribution of C/SiC composites nozzle export segment

图9 C/SiC复合材料喷嘴出口段环向密度与壁厚分布情况
Fig.9 Ring density and thickness distribution of C/SiC composites nozzle export segment

图10 C/SiC复合材料喷嘴冲蚀磨损情况示意图<br/>Fig.10 Schematic of C/SiC composites nozzle erosion wear

图10 C/SiC复合材料喷嘴冲蚀磨损情况示意图
Fig.10 Schematic of C/SiC composites nozzle erosion wear

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备注

引言

1 材料制备及试验方法

2 结果与讨论

3 C/SiC复合材料喷嘴冲蚀磨损机理

4 结论

期刊信息