Abstract
Onion-like carbon reinforced carbon-carbon composite was fabricated, and the influence of onion-like carbon (OLC) on the microstructure and mechanical and friction properties was investigated by porosity analysis, scanning electron microscopy, three-point bending test, nanoindentation test and ring-on-ring friction test. The results show that the sample containing OLC has a higher flexural strength (by 7.3%) and compressive strength (by 29.3%), hardness (by 2.1 times) and apparent density (by 1.1%) and smaller open porosity (7.9% vs 9.8%) and mesopore volume, which is confirmed by porosity analysis and is attributed to improved fiber/ matrix interface performance. The presence of OLC results in higher hardness and elastic modulus of carbon matrix under nanoindentation testing, which leads to modification of friction mechanism and a decrease in the wear rate under friction (by 3.3 times). Besides, OLC particles form self-lubricating film and show a graphitic carbon solid lubricant properties.
Highlights
Carbon fiber-reinforced carbon matrix composites (C/C composites) are widely used for the production of aircraft and automobile brakes, structural components, anti-ablation protection [1,2] and articles of chemical-resistant valves and pipes [3]
1) As shown in Table 1, hardness and elastic modulus of matrix for CC3 composite increased by 3.4 and 1.8 times, respectively, in comparison with CC0 composite, which lead to the growth of plastic index parameter and resistance to the plastic deformation (RPD) in 2 and 18 times, respectively. It can be connected both with additional matrix reinforcement by nanodiamond powder (NDP)/onion-like carbon (OLC) and decrease in the number and size of gaps between fiber and matrix and cracks which developed under carbonization shrinkage, which significantly increases mechanical properties of matrix and composite [9]
The source of OLC was nanodiamond powder (NDP), 3% w/w of which was added to the binder pitch under green preform preparation
Summary
Carbon fiber-reinforced carbon matrix composites (C/C composites) are widely used for the production of aircraft and automobile brakes, structural components, anti-ablation protection [1,2] and articles of chemical-resistant valves and pipes [3]. Presence of carbon filler particles leads to interaction between the filler and the binder pitch and stress-graphitization of matrix char [14], which influences matrix microstructure, and, as a result, alters mechanical properties of C/C composites based on different matrix microstructure [15,16]. The present work reports the results of C/C composites modification by OLC. The source of OLC was nanodiamond powder (NDP), which was added under matrix precursor modification. NDP and OLC demonstrate good performance for modification of polymer composites [19,20], but there is no data concerning matrix precursor modification by NDP or OLC for C/C composites production
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
