Particle erosion of C/C-SiC composites with different Al addition in reactive melt infiltrated Si
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Particle erosion of C/C-SiC composites with different Al addition in reactive melt infiltrated Si LIU Lei(刘磊)1, FENG Wei(冯薇)1, LI Bo-yan(李博岩)1, LI Jian-ping(李建平)1, ZHANG Lei-lei(张磊磊)2, GUO Yong-chun(郭永春)1, HE Zi-bo(何子博)1, CAO Yi(曹毅)2, BAO Ai-lin(包艾琳)1 1. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China; 2． State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Particle erosion of C/C-SiC composites prepared by reactive melt infiltration with different Al addition was studied by gas-entrained solid particle impingement test. SEM, EDS and XRD were performed to analyze the composites before and after erosion. The results indicate that a U shape relationship curve presents between the erosion rates and Al content, and the lowest erosion rate occurs at 40 wt% Al. Except for the important influence of compactness, the increasing soft Al mixed with reactive SiC, namely the mixture located between carbon and residual Si also, plays a key role in the erosion of the C/C-SiC composites through crack deflection, plastic deformation and bonding cracked Si. Key words: C/C-SiC; Al addition; reactive melt infiltration; solid particle erosion Cite this article as: LIU Lei, FENG Wei, LI Bo-yan, LI Jian-ping, ZHANG Lei-lei, GUO Yong-chun, HE Zi-bo, CAO Yi, BAO Ai-lin. Particle erosion of C/C-SiC composites with different Al addition in reactive melt infiltrated Si [J]. Journal of Central South University, 2020, 27(9): 2557−2566. DOI: https://doi.org/10.1007/s11771-020-4481-0.
1 Introduction C/C-SiC composites have great potential in many fields due to their low density, high strength, good wear resistance and outstanding thermal stability [1−5]. They can be used as housings and structural elements for optical systems [6], throat insert or nozzle [7], turbine engine blade [8], piston of internal combustion engine [9], brake disc of high speed or heavy vehicles [10], armor [11] and so on. In service, they will be damaged by space debris, un-burnt particles, fine sand, fragments and other solid particles. In other word, the strength and
lifespan of corresponding structural component would be weakened drastically by the particle flow. For example, the life of helicopter rotor blade decreased to 1/8 designed by solid particle erosion [12] and ablation rate of the composites in particle erosion environment was much higher than that without particle erosion [13, 14]. Up to now, particle erosion of polymer matrix composites [15], metal [16] and ceramic [17] has been greatly studied. However, to our best knowledge, few papers can be found on the erosion of the C/C-SiC composites induced by particle flow. It has been found that both more SiC and fewer pores are beneficial for the anti-erosion of C/C
Foundation item: Project(51902239) supported by the National Natural Science Foundation of China; Project(2020JQ-808) supported by the Scie
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