文章摘要
Effect of Mica Powder/Glass Powder/Sintering Aid Blending on Properties of Silicone Rubber
Received:October 10, 2020  Revised:October 10, 2020
DOI:10.12136/j.issn.1000-890X.2022.01.0034
Key Words: sintering aid;silicone rubber;mica powder;glass powder;flame retardant;ablation;flame retardant property
Author NameAffiliationE-mail
HE Chunjiang* Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited 13718307322@163.com 
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Abstract:
      The effects of blending a self-made sintering aid with flame retardant mica powder and glass powder on the physical properties and flame retardant properties of the silicone rubber,as well as the appearance morphology and residual mass rate after the ablation process, were studied. The results showed that,the sintering aid promoted the sintering of mica powder,and the mica powder/glass powder/sintering aid blend(4/1/1 of blend ratio) had a better sintering effect than that of the mica powder/glass powder blend(2/1 of blend ratio) and mica powder/sintering aid blend(2/1 of blend ratio). The addition of mica powder/glass powder/sintering aid blend reduced the tensile properties of the silicone rubber,but promoted the rapid formation of a homogeneous,dense,continuous,smooth and fine ceramicized hard shell of the silicone rubber at high temperature,which could block the heat and oxygen from entering the interior of the silicone rubber,so that the thermal decomposition rate of the silicone rubber was reduced,the oxygen index, vertical combustion grade and three-point bending strength were improved,and the residual mass rate after ablation was increased.
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