| Effect of Boron-based Compounds on Properties of Ceramizable Silicone Rubber Composites |
| Received:April 11, 2022 Revised:April 11, 2022 |
| DOI：10.12136/j.issn.1000-890X.2023.10.0773 |
| Key Words: boron-based compounds；ceramizable silicon rubber；ceramic body；thermal stability；flexural strength；micromorphology |
| Author Name | Affiliation | E-mail | | WANG Xiaotian | Wuhan University of Technology | 835645582@qq.com | | ZHAO Chenglong | Wuhan University of Technology | | | QIN Yan* | Wuhan University of Technology | qinrock@sina. com |
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| Abstract: |
| Effect of the dosage ratio of boron compound B1（particle size 5～10 μm）/B2（particle size 2～3 μm）on the physical properties and thermal stability of the ceramizable silicon rubber composite was studied.The micromorphology and phase evolution of the ceramic body of the ceramizable silicone rubber composite at different ablation temperatures were also studied.The results showed that，when the dosage ratio of boron compounds B1/B2was 30/20，the tensile strength and elongation at break of the ceramizable silicone rubber composite were the highest，4.11 MPa and 255% respectively.At a lower ablation temperature （600～800 ℃），with the increase of the dosage ratio of boron compounds B1/B2，the flexural strength of the ceramic body of the ceramizable silicone rubber composite increased and the linear shrinkage decreased，but these changes were not significant.At a higher ablation temperature（800～900 ℃），the flexural strength of the ceramic body of the ceramizable silicone rubber composite initially decreased and then increased，and many liquid substances were generated in the system，forming a dense ceramic layer，which slowed down the heat transfer，hindered the oxidation of the internal materials by oxygen，improved the thermal stability of the composite，and increased the bending strength of the ceramic body. |
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