Abstract: Ceramicizable silicone rubber composites are prepared with glass powder and mica powder as ceramic fillers. The effects of 80 parts of ceramic fillers and the ratio of glass powder and mica powder on the mechanical properties, flame retardancy, thermal stability and ceramic properties of silicone rubber were. The results show that the ceramic filler has a great influence on the mechanical properties of silicone rubber composites. The maximum tensile strength of composites is 5.96 MPa and the elongation at break is 421.3% with the loading of 30 phr glass powder and 50 phr mica powder. The flame retardancy of composites are improved with the addition of ceramic fillers. The maximum LOI value of composites is 28.4 while 20 phr glass powder and 60 phr mica powder are added. The addition of ceramic fillers significantly reduced the initial and maximum thermal decomposition temperatures of the composites while increased the residues at high temperature. The ceramic properties of the composites are significantly improved at high temperature. The ratio of glass powder to mica powder has a few effects on the mechanical properties, flame retardancy and thermal stability of the composites. As the increase of the loading of glass powder, the structure of the ceramics are more compact, the three-point bending strength of ceramics also increase and the maximum value is 15.53 MPa.

Key words: silicone rubber; ceramic fillers; mechanical properties; flame retardancy; thermal stability; ceramicable