Open Access

ARTICLE

Protective Graphite Coating for Two-Dimensional Carbon/Carbon Composites

by Wei Shi^1,2, Zhengyi Li¹, Xiaobing Xu¹, Yingshui Yu¹, Xiaofei Ding¹, Heng Ju^1,*

1 School of Mechanical and Power Engineering, Dalian Ocean University, Dalian, 116023, China
2 School of Mechanical and Electrical Engineering, Gongqing Institute of Science and Technology, Jiujiang, 332020, China

* Corresponding Author: Heng Ju. Email:

Fluid Dynamics & Materials Processing 2024, 20(1), 97-108. https://doi.org/10.32604/fdmp.2023.029028

Received 26 January 2023; Accepted 05 May 2023; Issue published 08 November 2023

Abstract

Two-dimensional carbon/carbon (2D C/C) composites are a special class of carbon/carbon composites, generally obtained by combining resin-impregnated carbon fiber clothes, which are then cured and carbonized. This study deals with the preparation of a protective coating for these materials. This coating, based on graphite, was prepared by the slurry method. The effect of graphite and phenolic resin powders with different weight ratios was examined. The results have shown that the coating slurry can fill the pores and cracks of the composite surface, thereby densifying the surface layer of the material. With the increase of the graphite powder/phenolic resin weight ratio, the coating density is enhanced while the coating surface flatness decreases; moreover, the protective ability of coating against erosion first increases (from 1:3 to 2:2) and then decreases (from 2:2 to 3:1). When the weight ratio is about 1:1, the coating for 2D C/C composites exhibits the best erosion resistance, which greatly aids these materials during gas quenching. In this case, the erosion rate is decreased by approximately 41.5% at the impact angle of 30° and 52.3% at normal impact, respectively. This can be attributed to the ability of the coating slurry to infiltrate into the substrate, thereby bonding the fibers together and increasing the compactness of the 2D C/C composites.

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Keywords

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