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Mechanical properties and ceramification process of composite-filled flame-retardant silicone rubber.

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Title: Mechanical properties and ceramification process of composite-filled flame-retardant silicone rubber.
Authors: Han, Yuliang1 (AUTHOR), Deng, Jiajia1 (AUTHOR), Ji, Xinyuan1 (AUTHOR), Wu, Zhenqin1 (AUTHOR), Hu, Sheng1,2 (AUTHOR) cailiaoxue007@126.com
Source: Ceramics International. May2026:Part B, Vol. 52 Issue 11, p16696-16707. 12p.
Subjects: Filler materials, Ceramic engineering, Fire resistant materials, Silicone rubber, Mechanical behavior of materials, Ablative materials, Thermolysis
Abstract: Thermally protective silicone rubber materials are widely used in cable sheathing and architectural coatings due to their multifunctionality. However, the synergistic mechanisms of multi-component filler systems in silicone rubber-based thermal protection materials remain insufficiently understood. To address this, the present study investigates the mechanical properties and ceramification behavior of mica/ammonium polyphosphate/glass powder/zinc borate/aluminum hydroxide composite silicone rubber (MSR). The findings reveal significant synergistic effects among the different functional fillers, which collectively drive and optimize the ceramification process. The decomposition products of ammonium polyphosphate promote the formation of phosphate ceramic phases (such as Zn 3 (PO 4) 2 and AlPO 4), which together with mica establish a self-supporting porous framework at 400 °C. Zinc borate and glass powder act as efficient fluxing agents, flowing and filling the pores, thereby markedly enhancing the density of the structure. At 800 °C, the system further reacts to form high-temperature stable phases such as Zn 2 P 2 O 7 , ZnAl 2 O 4 and mullite. These phases, in combination with the formed borosilicate glass, jointly create a relatively dense and integrated ceramic structure, endowing the material with excellent mechanical properties at elevated temperatures. The synergistic mechanisms of the multi-component filler system are elucidated throughout the entire process from thermal decomposition to ceramic sintering in this study, thereby providing a theoretical basis and design guidance for the development of high-performance ablative thermal protection materials. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Thermally protective silicone rubber materials are widely used in cable sheathing and architectural coatings due to their multifunctionality. However, the synergistic mechanisms of multi-component filler systems in silicone rubber-based thermal protection materials remain insufficiently understood. To address this, the present study investigates the mechanical properties and ceramification behavior of mica/ammonium polyphosphate/glass powder/zinc borate/aluminum hydroxide composite silicone rubber (MSR). The findings reveal significant synergistic effects among the different functional fillers, which collectively drive and optimize the ceramification process. The decomposition products of ammonium polyphosphate promote the formation of phosphate ceramic phases (such as Zn 3 (PO 4) 2 and AlPO 4), which together with mica establish a self-supporting porous framework at 400 °C. Zinc borate and glass powder act as efficient fluxing agents, flowing and filling the pores, thereby markedly enhancing the density of the structure. At 800 °C, the system further reacts to form high-temperature stable phases such as Zn 2 P 2 O 7 , ZnAl 2 O 4 and mullite. These phases, in combination with the formed borosilicate glass, jointly create a relatively dense and integrated ceramic structure, endowing the material with excellent mechanical properties at elevated temperatures. The synergistic mechanisms of the multi-component filler system are elucidated throughout the entire process from thermal decomposition to ceramic sintering in this study, thereby providing a theoretical basis and design guidance for the development of high-performance ablative thermal protection materials. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.02.260