Effects of multi-walled carbon nanotubes on char residue and carbothermal reduction reaction in ethylene propylene diene monomer composites at high temperature. (20th January 2020)

• Record Type: Journal Article
• Authors: Guo, Mengfei; Li, Jiang; Xi, Kun; Liu, Yang; Ji, Jianbo; Ye, Changqing
• Is Part Of: Composites science and technology. Volume 186(2020)
• Publication Date: 2020-01-20
• Subjects: Polymer-matrix composites (PMCs) -- Carbon nanotubes -- Thermal properties -- Scanning electron microscopy (SEM); Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2019.107916
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: Mechanistic investigation of the effect of nanofillers on the ablation of composites is essential to meet the demand for high-performance ablative composites. Ethylene propylene diene monomer (EPDM) composites with and without 5 wt% multi-walled carbon nanotubes (MWCNTs) are prepared, and their ablation rates are tested using a solid rocket motor. The carbothermal reduction reaction during ablation is studied using a high-temperature tube furnace. The carbothermal reduction reaction of silica at high temperature results in a large consumption of char, and is an important reaction affecting the ablation process. The addition of MWCNTs increases the char residue of EPDM composites. MWCNTs can enhance the rate-limiting reaction, thereby reducing the released gas and increasing the production of SiC. The network structure of MWCNTs in char has a directional effect on the in-situ formation of SiCw, which can improve the ablation resistance of composite.