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Materials 2016, 9(9), 723; doi:10.3390/ma9090723

Improved Ablation Resistance of Silicone Rubber Composites by Introducing Montmorillonite and Silicon Carbide Whisker

1
Key Laboratory of Advanced Technology for Specially Functional Materials of Ministry of Education, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2
School of Materials Science and Engineering, Qilu University of Technology, Jinan 250353, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Dinesh Agrawal
Received: 18 June 2016 / Revised: 5 August 2016 / Accepted: 18 August 2016 / Published: 24 August 2016
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [8671 KB, uploaded 24 August 2016]   |  

Abstract

Montmorillonite (MMT) was added to silicone rubber (SR) to improve the ablation resistance of the silicone. Following this, different quantities of silicon carbide whiskers (SiCw) were incorporated into the MMT/SR to yield a hybrid, ablative composite. The tensile strength and elongation at break of the composite increased after the addition of MMT. The ablation test results showed that MMT helped to form a covering layer by bonding with the silica and other components on the ablated surface. The linear and mass ablation rates exhibited decreases of 22.5% and 18.2%, respectively, in comparison to a control sample. After further incorporation of SiCw as the second filler, the resulting composites exhibited significantly higher tensile strength and ablation resistance, but not particularly lower elongation at break in comparison to the control sample. The SiCw/MMT fillers were beneficial in forming a dense and compact covering layer that delayed the heat and oxygen diffusion into the inner layers, which improved the ablation properties effectively. The remaining whiskers acted as a micro skeleton to maintain the composite’s char strength. Compared to the control sample, the linear and mass ablation rates of the composite after incorporating 6 phr SiCw and 10 phr MMT decreased by 59.2% and 43.6%, respectively. These experimental results showed that the fabricated composites exhibited outstanding mechanical properties and excellent ablation resistance. View Full-Text
Keywords: silicone rubber; ablation resistance; mechanical properties; montmorillonite; silicon carbide whisker silicone rubber; ablation resistance; mechanical properties; montmorillonite; silicon carbide whisker
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, G.; Wang, F.; Huang, Z.; Dai, J.; Shi, M. Improved Ablation Resistance of Silicone Rubber Composites by Introducing Montmorillonite and Silicon Carbide Whisker. Materials 2016, 9, 723.

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