| 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 Name | Affiliation | E-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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